From ab7591e45e7e31b4e2c0e2f81e224672145993fa Mon Sep 17 00:00:00 2001
From: "(quasar) nebula" <qznebula@protonmail.com>
Date: Sun, 1 Oct 2023 17:01:21 -0300
Subject: data, test: refactor utilities into own file

Primarily for more precies test coverage mapping, but also to make
navigation a bit easier and consolidate complex functions with
lots of imports out of the same space as other, more simple or
otherwise specialized files.
---
 .../composite/common-utilities/exposeConstant.js   |  46 ----
 .../composite/common-utilities/exposeDependency.js |  68 ------
 .../common-utilities/withPropertiesFromObject.js   | 251 ---------------------
 .../common-utilities/withPropertyFromObject.js     | 125 ----------
 .../withResultOfAvailabilityCheck.js               | 177 ---------------
 .../data/composite/control-flow/exposeConstant.js  |  42 ++++
 .../composite/control-flow/exposeDependency.js     |  64 ++++++
 .../control-flow/withResultOfAvailabilityCheck.js  | 173 ++++++++++++++
 .../composite/data/withPropertiesFromObject.js     | 248 ++++++++++++++++++++
 .../data/composite/data/withPropertyFromObject.js  | 122 ++++++++++
 10 files changed, 649 insertions(+), 667 deletions(-)
 delete mode 100644 test/unit/data/composite/common-utilities/exposeConstant.js
 delete mode 100644 test/unit/data/composite/common-utilities/exposeDependency.js
 delete mode 100644 test/unit/data/composite/common-utilities/withPropertiesFromObject.js
 delete mode 100644 test/unit/data/composite/common-utilities/withPropertyFromObject.js
 delete mode 100644 test/unit/data/composite/common-utilities/withResultOfAvailabilityCheck.js
 create mode 100644 test/unit/data/composite/control-flow/exposeConstant.js
 create mode 100644 test/unit/data/composite/control-flow/exposeDependency.js
 create mode 100644 test/unit/data/composite/control-flow/withResultOfAvailabilityCheck.js
 create mode 100644 test/unit/data/composite/data/withPropertiesFromObject.js
 create mode 100644 test/unit/data/composite/data/withPropertyFromObject.js

(limited to 'test/unit/data')

diff --git a/test/unit/data/composite/common-utilities/exposeConstant.js b/test/unit/data/composite/common-utilities/exposeConstant.js
deleted file mode 100644
index bfed0951..00000000
--- a/test/unit/data/composite/common-utilities/exposeConstant.js
+++ /dev/null
@@ -1,46 +0,0 @@
-import t from 'tap';
-
-import {
-  compositeFrom,
-  continuationSymbol,
-  exposeConstant,
-  input,
-} from '#composite';
-
-t.test(`exposeConstant: basic behavior`, t => {
-  t.plan(2);
-
-  const composite1 = compositeFrom({
-    compose: false,
-
-    steps: [
-      exposeConstant({
-        value: input.value('foo'),
-      }),
-    ],
-  });
-
-  t.match(composite1, {
-    expose: {
-      dependencies: [],
-    },
-  });
-
-  t.equal(composite1.expose.compute(), 'foo');
-});
-
-t.test(`exposeConstant: validate inputs`, t => {
-  t.plan(2);
-
-  t.throws(
-    () => exposeConstant({}),
-    {message: `Errors in input options passed to exposeConstant`, errors: [
-      {message: `Required these inputs: value`},
-    ]});
-
-  t.throws(
-    () => exposeConstant({value: 'some dependency'}),
-    {message: `Errors in input options passed to exposeConstant`, errors: [
-      {message: `value: Expected input.value() call, got dependency name`},
-    ]});
-});
diff --git a/test/unit/data/composite/common-utilities/exposeDependency.js b/test/unit/data/composite/common-utilities/exposeDependency.js
deleted file mode 100644
index 4f07cc16..00000000
--- a/test/unit/data/composite/common-utilities/exposeDependency.js
+++ /dev/null
@@ -1,68 +0,0 @@
-import t from 'tap';
-
-import {
-  compositeFrom,
-  continuationSymbol,
-  exposeDependency,
-  input,
-} from '#composite';
-
-t.test(`exposeDependency: basic behavior`, t => {
-  t.plan(4);
-
-  const composite1 = compositeFrom({
-    compose: false,
-
-    steps: [
-      exposeDependency({dependency: 'foo'}),
-    ],
-  });
-
-  t.match(composite1, {
-    expose: {
-      dependencies: ['foo'],
-    },
-  });
-
-  t.equal(composite1.expose.compute({foo: 'bar'}), 'bar');
-
-  const composite2 = compositeFrom({
-    compose: false,
-
-    steps: [
-      {
-        dependencies: ['foo'],
-        compute: (continuation, {foo}) =>
-          continuation({'#bar': foo.toUpperCase()}),
-      },
-
-      exposeDependency({dependency: '#bar'}),
-    ],
-  });
-
-  t.match(composite2, {
-    expose: {
-      dependencies: ['foo'],
-    },
-  });
-
-  t.equal(composite2.expose.compute({foo: 'bar'}), 'BAR');
-});
-
-t.test(`exposeDependency: validate inputs`, t => {
-  t.plan(2);
-
-  t.throws(
-    () => exposeDependency({}),
-    {message: `Errors in input options passed to exposeDependency`, errors: [
-      {message: `Required these inputs: dependency`},
-    ]});
-
-  t.throws(
-    () => exposeDependency({
-      dependency: input.value('some static value'),
-    }),
-    {message: `Errors in input options passed to exposeDependency`, errors: [
-      {message: `dependency: Expected dependency name, got input.value() call`},
-    ]});
-});
diff --git a/test/unit/data/composite/common-utilities/withPropertiesFromObject.js b/test/unit/data/composite/common-utilities/withPropertiesFromObject.js
deleted file mode 100644
index 3431382e..00000000
--- a/test/unit/data/composite/common-utilities/withPropertiesFromObject.js
+++ /dev/null
@@ -1,251 +0,0 @@
-import t from 'tap';
-
-import {
-  compositeFrom,
-  exposeDependency,
-  input,
-  withPropertiesFromObject,
-} from '#composite';
-
-const composite = compositeFrom({
-  compose: false,
-
-  steps: [
-    withPropertiesFromObject({
-      object: 'object',
-      properties: 'properties',
-    }),
-
-    exposeDependency({dependency: '#object'}),
-  ],
-});
-
-t.test(`withPropertiesFromObject: basic behavior`, t => {
-  t.plan(4);
-
-  t.match(composite, {
-    expose: {
-      dependencies: ['object', 'properties'],
-    },
-  });
-
-  t.same(
-    composite.expose.compute({
-      object: {foo: 'bar', bim: 'BOOM', bam: 'baz'},
-      properties: ['foo', 'bim'],
-    }),
-    {foo: 'bar', bim: 'BOOM'});
-
-  t.same(
-    composite.expose.compute({
-      object: {value1: 'uwah', value2: 'arah'},
-      properties: ['value1', 'value3'],
-    }),
-    {value1: 'uwah', value3: null});
-
-  t.same(
-    composite.expose.compute({
-      object: null,
-      properties: ['ohMe', 'ohMy', 'ohDear'],
-    }),
-    {ohMe: null, ohMy: null, ohDear: null});
-});
-
-t.test(`withPropertiesFromObject: output shapes & values`, t => {
-  t.plan(2 * 2 * 3 ** 2);
-
-  const dependencies = {
-    ['object_dependency']:
-      {foo: 'apple', bar: 'banana', baz: 'orange'},
-    [input('object_neither')]:
-      {foo: 'koala', bar: 'okapi', baz: 'mongoose'},
-    ['properties_dependency']:
-      ['foo', 'bar', 'missing1'],
-    [input('properties_neither')]:
-      ['foo', 'baz', 'missing3'],
-  };
-
-  const mapLevel1 = [
-    [input.value('prefix_value'), [
-      ['object_dependency', [
-        ['properties_dependency', {
-          '#object': {foo: 'apple', bar: 'banana', missing1: null},
-        }],
-        [input.value(['bar', 'baz', 'missing2']), {
-          '#prefix_value.bar': 'banana',
-          '#prefix_value.baz': 'orange',
-          '#prefix_value.missing2': null,
-        }],
-        [input('properties_neither'), {
-          '#object': {foo: 'apple', baz: 'orange', missing3: null},
-        }]]],
-
-      [input.value({foo: 'ouh', bar: 'rah', baz: 'nyu'}), [
-        ['properties_dependency', {
-          '#object': {foo: 'ouh', bar: 'rah', missing1: null},
-        }],
-        [input.value(['bar', 'baz', 'missing2']), {
-          '#prefix_value.bar': 'rah',
-          '#prefix_value.baz': 'nyu',
-          '#prefix_value.missing2': null,
-        }],
-        [input('properties_neither'), {
-          '#object': {foo: 'ouh', baz: 'nyu', missing3: null},
-        }]]],
-
-      [input('object_neither'), [
-        ['properties_dependency', {
-          '#object': {foo: 'koala', bar: 'okapi', missing1: null},
-        }],
-        [input.value(['bar', 'baz', 'missing2']), {
-          '#prefix_value.bar': 'okapi',
-          '#prefix_value.baz': 'mongoose',
-          '#prefix_value.missing2': null,
-        }],
-        [input('properties_neither'), {
-          '#object': {foo: 'koala', baz: 'mongoose', missing3: null},
-        }]]]]],
-
-    [input.value(null), [
-      ['object_dependency', [
-        ['properties_dependency', {
-          '#object': {foo: 'apple', bar: 'banana', missing1: null},
-        }],
-        [input.value(['bar', 'baz', 'missing2']), {
-          '#object_dependency.bar': 'banana',
-          '#object_dependency.baz': 'orange',
-          '#object_dependency.missing2': null,
-        }],
-        [input('properties_neither'), {
-          '#object': {foo: 'apple', baz: 'orange', missing3: null},
-        }]]],
-
-      [input.value({foo: 'ouh', bar: 'rah', baz: 'nyu'}), [
-        ['properties_dependency', {
-          '#object': {foo: 'ouh', bar: 'rah', missing1: null},
-        }],
-        [input.value(['bar', 'baz', 'missing2']), {
-          '#object.bar': 'rah',
-          '#object.baz': 'nyu',
-          '#object.missing2': null,
-        }],
-        [input('properties_neither'), {
-          '#object': {foo: 'ouh', baz: 'nyu', missing3: null},
-        }]]],
-
-      [input('object_neither'), [
-        ['properties_dependency', {
-          '#object': {foo: 'koala', bar: 'okapi', missing1: null},
-        }],
-        [input.value(['bar', 'baz', 'missing2']), {
-          '#object.bar': 'okapi',
-          '#object.baz': 'mongoose',
-          '#object.missing2': null,
-        }],
-        [input('properties_neither'), {
-          '#object': {foo: 'koala', baz: 'mongoose', missing3: null},
-        }]]]]],
-  ];
-
-  for (const [prefixInput, mapLevel2] of mapLevel1) {
-    for (const [objectInput, mapLevel3] of mapLevel2) {
-      for (const [propertiesInput, outputDict] of mapLevel3) {
-        const step = withPropertiesFromObject({
-          prefix: prefixInput,
-          object: objectInput,
-          properties: propertiesInput,
-        });
-
-        quickCheckOutputs(step, outputDict);
-      }
-    }
-  }
-
-  function quickCheckOutputs(step, outputDict) {
-    t.same(
-      Object.keys(step.toDescription().outputs),
-      Object.keys(outputDict));
-
-    const composite = compositeFrom({
-      compose: false,
-      steps: [step, {
-        dependencies: Object.keys(outputDict),
-        compute: dependencies => dependencies,
-      }],
-    });
-
-    t.same(
-      composite.expose.compute(dependencies),
-      outputDict);
-  }
-});
-
-t.test(`withPropertiesFromObject: validate static inputs`, t => {
-  t.plan(3);
-
-  t.throws(
-    () => withPropertiesFromObject({}),
-    {message: `Errors in input options passed to withPropertiesFromObject`, errors: [
-      {message: `Required these inputs: object, properties`},
-    ]});
-
-  t.throws(
-    () => withPropertiesFromObject({
-      object: input.value('intriguing'),
-      properties: input.value('very'),
-      prefix: input.value({yes: 'yup'}),
-    }),
-    {message: `Errors in input options passed to withPropertiesFromObject`, errors: [
-      {message: `object: Expected an object, got string`},
-      {message: `properties: Expected an array, got string`},
-      {message: `prefix: Expected a string, got object`},
-    ]});
-
-  t.throws(
-    () => withPropertiesFromObject({
-      object: input.value([['abc', 1], ['def', 2], [123, 3]]),
-      properties: input.value(['abc', 'def', 123]),
-    }),
-    {message: `Errors in input options passed to withPropertiesFromObject`, errors: [
-      {message: `object: Expected an object, got array`},
-      {message: `properties: Errors validating array items`, errors: [
-        {
-          [Symbol.for('hsmusic.decorate.indexInSourceArray')]: 2,
-          message: /Expected a string, got number/,
-        },
-      ]},
-    ]});
-});
-
-t.test(`withPropertiesFromObject: validate dynamic inputs`, t => {
-  t.plan(2);
-
-  t.throws(
-    () => composite.expose.compute({
-      object: 'intriguing',
-      properties: 'onceMore',
-    }),
-    {message: `Error computing composition`, cause:
-      {message: `Error computing composition withPropertiesFromObject`, cause:
-        {message: `Errors in input values provided to withPropertiesFromObject`, errors: [
-          {message: `object: Expected an object, got string`},
-          {message: `properties: Expected an array, got string`},
-        ]}}});
-
-  t.throws(
-    () => composite.expose.compute({
-      object: [['abc', 1], ['def', 2], [123, 3]],
-      properties: ['abc', 'def', 123],
-    }),
-    {message: `Error computing composition`, cause:
-      {message: `Error computing composition withPropertiesFromObject`, cause:
-        {message: `Errors in input values provided to withPropertiesFromObject`, errors: [
-          {message: `object: Expected an object, got array`},
-          {message: `properties: Errors validating array items`, errors: [
-            {
-              [Symbol.for('hsmusic.decorate.indexInSourceArray')]: 2,
-              message: /Expected a string, got number/,
-            },
-          ]},
-        ]}}});
-});
diff --git a/test/unit/data/composite/common-utilities/withPropertyFromObject.js b/test/unit/data/composite/common-utilities/withPropertyFromObject.js
deleted file mode 100644
index 11487226..00000000
--- a/test/unit/data/composite/common-utilities/withPropertyFromObject.js
+++ /dev/null
@@ -1,125 +0,0 @@
-import t from 'tap';
-
-import {
-  compositeFrom,
-  exposeDependency,
-  input,
-  withPropertyFromObject,
-} from '#composite';
-
-t.test(`withPropertyFromObject: basic behavior`, t => {
-  t.plan(4);
-
-  const composite = compositeFrom({
-    compose: false,
-
-    steps: [
-      withPropertyFromObject({
-        object: 'object',
-        property: 'property',
-      }),
-
-      exposeDependency({dependency: '#value'}),
-    ],
-  });
-
-  t.match(composite, {
-    expose: {
-      dependencies: ['object', 'property'],
-    },
-  });
-
-  t.equal(composite.expose.compute({
-    object: {foo: 'bar', bim: 'BOOM'},
-    property: 'bim',
-  }), 'BOOM');
-
-  t.equal(composite.expose.compute({
-    object: {value1: 'uwah'},
-    property: 'value2',
-  }), null);
-
-  t.equal(composite.expose.compute({
-    object: null,
-    property: 'oml where did me object go',
-  }), null);
-});
-
-t.test(`withPropertyFromObject: output shapes & values`, t => {
-  t.plan(2 * 3 ** 2);
-
-  const dependencies = {
-    ['object_dependency']:
-      {foo: 'apple', bar: 'banana', baz: 'orange'},
-    [input('object_neither')]:
-      {foo: 'koala', bar: 'okapi', baz: 'mongoose'},
-    ['property_dependency']:
-      'foo',
-    [input('property_neither')]:
-      'baz',
-  };
-
-  const mapLevel1 = [
-    ['object_dependency', [
-      ['property_dependency', {
-        '#value': 'apple',
-      }],
-      [input.value('bar'), {
-        '#object_dependency.bar': 'banana',
-      }],
-      [input('property_neither'), {
-        '#value': 'orange',
-      }]]],
-
-    [input.value({foo: 'ouh', bar: 'rah', baz: 'nyu'}), [
-      ['property_dependency', {
-        '#value': 'ouh',
-      }],
-      [input.value('bar'), {
-        '#value': 'rah',
-      }],
-      [input('property_neither'), {
-        '#value': 'nyu',
-      }]]],
-
-    [input('object_neither'), [
-      ['property_dependency', {
-        '#value': 'koala',
-      }],
-      [input.value('bar'), {
-        '#value': 'okapi',
-      }],
-      [input('property_neither'), {
-        '#value': 'mongoose',
-      }]]],
-  ];
-
-  for (const [objectInput, mapLevel2] of mapLevel1) {
-    for (const [propertyInput, outputDict] of mapLevel2) {
-      const step = withPropertyFromObject({
-        object: objectInput,
-        property: propertyInput,
-      });
-
-      quickCheckOutputs(step, outputDict);
-    }
-  }
-
-  function quickCheckOutputs(step, outputDict) {
-    t.same(
-      Object.keys(step.toDescription().outputs),
-      Object.keys(outputDict));
-
-    const composite = compositeFrom({
-      compose: false,
-      steps: [step, {
-        dependencies: Object.keys(outputDict),
-        compute: dependencies => dependencies,
-      }],
-    });
-
-    t.same(
-      composite.expose.compute(dependencies),
-      outputDict);
-  }
-});
diff --git a/test/unit/data/composite/common-utilities/withResultOfAvailabilityCheck.js b/test/unit/data/composite/common-utilities/withResultOfAvailabilityCheck.js
deleted file mode 100644
index 50c127d3..00000000
--- a/test/unit/data/composite/common-utilities/withResultOfAvailabilityCheck.js
+++ /dev/null
@@ -1,177 +0,0 @@
-import t from 'tap';
-
-import {
-  compositeFrom,
-  continuationSymbol,
-  input,
-  withResultOfAvailabilityCheck,
-} from '#composite';
-
-const composite = compositeFrom({
-  compose: false,
-
-  steps: [
-    withResultOfAvailabilityCheck({
-      from: 'from',
-      mode: 'mode',
-    }).outputs({
-      ['#availability']: '#result',
-    }),
-
-    {
-      dependencies: ['#result'],
-      compute: ({'#result': result}) => result,
-    },
-  ],
-});
-
-t.test(`withResultOfAvailabilityCheck: basic behavior`, t => {
-  t.plan(1);
-
-  t.match(composite, {
-    expose: {
-      dependencies: ['from', 'mode'],
-    },
-  });
-});
-
-const quickCompare = (t, expect, {from, mode}) =>
-  t.equal(composite.expose.compute({from, mode}), expect);
-
-const quickThrows = (t, {from, mode}) =>
-  t.throws(() => composite.expose.compute({from, mode}));
-
-t.test(`withResultOfAvailabilityCheck: mode = null`, t => {
-  t.plan(10);
-
-  quickCompare(t, true,  {mode: 'null', from: 'truthy string'});
-  quickCompare(t, true,  {mode: 'null', from: 123});
-  quickCompare(t, true,  {mode: 'null', from: true});
-
-  quickCompare(t, true,  {mode: 'null', from: ''});
-  quickCompare(t, true,  {mode: 'null', from: 0});
-  quickCompare(t, true,  {mode: 'null', from: false});
-
-  quickCompare(t, true,  {mode: 'null', from: [1, 2, 3]});
-  quickCompare(t, true,  {mode: 'null', from: []});
-
-  quickCompare(t, false, {mode: 'null', from: null});
-  quickCompare(t, false, {mode: 'null', from: undefined});
-});
-
-t.test(`withResultOfAvailabilityCheck: mode = empty`, t => {
-  t.plan(10);
-
-  quickThrows(t, {mode: 'empty', from: 'truthy string'});
-  quickThrows(t, {mode: 'empty', from: 123});
-  quickThrows(t, {mode: 'empty', from: true});
-
-  quickThrows(t, {mode: 'empty', from: ''});
-  quickThrows(t, {mode: 'empty', from: 0});
-  quickThrows(t, {mode: 'empty', from: false});
-
-  quickCompare(t, true,  {mode: 'empty', from: [1, 2, 3]});
-  quickCompare(t, false, {mode: 'empty', from: []});
-
-  quickCompare(t, false, {mode: 'empty', from: null});
-  quickCompare(t, false, {mode: 'empty', from: undefined});
-});
-
-t.test(`withResultOfAvailabilityCheck: mode = falsy`, t => {
-  t.plan(10);
-
-  quickCompare(t, true,  {mode: 'falsy', from: 'truthy string'});
-  quickCompare(t, true,  {mode: 'falsy', from: 123});
-  quickCompare(t, true,  {mode: 'falsy', from: true});
-
-  quickCompare(t, false, {mode: 'falsy', from: ''});
-  quickCompare(t, false, {mode: 'falsy', from: 0});
-  quickCompare(t, false, {mode: 'falsy', from: false});
-
-  quickCompare(t, true,  {mode: 'falsy', from: [1, 2, 3]});
-  quickCompare(t, false, {mode: 'falsy', from: []});
-
-  quickCompare(t, false, {mode: 'falsy', from: null});
-  quickCompare(t, false, {mode: 'falsy', from: undefined});
-});
-
-t.test(`withResultOfAvailabilityCheck: default mode`, t => {
-  t.plan(1);
-
-  const template = withResultOfAvailabilityCheck({
-    from: 'foo',
-  });
-
-  t.match(template.toDescription(), {
-    inputMapping: {
-      from: input.dependency('foo'),
-      mode: input.value('null'),
-    },
-  });
-});
-
-t.test(`withResultOfAvailabilityCheck: validate static inputs`, t => {
-  t.plan(5);
-
-  t.throws(
-    () => withResultOfAvailabilityCheck({}),
-    {message: `Errors in input options passed to withResultOfAvailabilityCheck`, errors: [
-      {message: `Required these inputs: from`},
-    ]});
-
-  t.doesNotThrow(() =>
-    withResultOfAvailabilityCheck({
-      from: 'dependency1',
-      mode: 'dependency2',
-    }));
-
-  t.doesNotThrow(() =>
-    withResultOfAvailabilityCheck({
-      from: input.value('some static value'),
-      mode: input.value('null'),
-    }));
-
-  t.throws(
-    () => withResultOfAvailabilityCheck({
-      from: 'foo',
-      mode: input.value('invalid'),
-    }),
-    {message: `Errors in input options passed to withResultOfAvailabilityCheck`, errors: [
-      {message: `mode: Expected one of null empty falsy, got invalid`},
-    ]});
-
-  t.throws(() =>
-    withResultOfAvailabilityCheck({
-      from: input.value(null),
-      mode: input.value(null),
-    }),
-    {message: `Errors in input options passed to withResultOfAvailabilityCheck`, errors: [
-      {message: `mode: Expected a value, got null`},
-    ]});
-});
-
-t.test(`withResultOfAvailabilityCheck: validate dynamic inputs`, t => {
-  t.plan(2);
-
-  t.throws(
-    () => composite.expose.compute({
-      from: 'apple',
-      mode: 'banana',
-    }),
-    {message: `Error computing composition`, cause:
-      {message: `Error computing composition withResultOfAvailabilityCheck`, cause:
-        {message: `Errors in input values provided to withResultOfAvailabilityCheck`, errors: [
-          {message: `mode: Expected one of null empty falsy, got banana`},
-        ]}}});
-
-  t.throws(
-    () => composite.expose.compute({
-      from: null,
-      mode: null,
-    }),
-    {message: `Error computing composition`, cause:
-      {message: `Error computing composition withResultOfAvailabilityCheck`, cause:
-        {message: `Errors in input values provided to withResultOfAvailabilityCheck`, errors: [
-          {message: `mode: Expected a value, got null`},
-        ]}}});
-});
diff --git a/test/unit/data/composite/control-flow/exposeConstant.js b/test/unit/data/composite/control-flow/exposeConstant.js
new file mode 100644
index 00000000..0c75894b
--- /dev/null
+++ b/test/unit/data/composite/control-flow/exposeConstant.js
@@ -0,0 +1,42 @@
+import t from 'tap';
+
+import {compositeFrom, continuationSymbol, input} from '#composite';
+import {exposeConstant} from '#composite/control-flow';
+
+t.test(`exposeConstant: basic behavior`, t => {
+  t.plan(2);
+
+  const composite1 = compositeFrom({
+    compose: false,
+
+    steps: [
+      exposeConstant({
+        value: input.value('foo'),
+      }),
+    ],
+  });
+
+  t.match(composite1, {
+    expose: {
+      dependencies: [],
+    },
+  });
+
+  t.equal(composite1.expose.compute(), 'foo');
+});
+
+t.test(`exposeConstant: validate inputs`, t => {
+  t.plan(2);
+
+  t.throws(
+    () => exposeConstant({}),
+    {message: `Errors in input options passed to exposeConstant`, errors: [
+      {message: `Required these inputs: value`},
+    ]});
+
+  t.throws(
+    () => exposeConstant({value: 'some dependency'}),
+    {message: `Errors in input options passed to exposeConstant`, errors: [
+      {message: `value: Expected input.value() call, got dependency name`},
+    ]});
+});
diff --git a/test/unit/data/composite/control-flow/exposeDependency.js b/test/unit/data/composite/control-flow/exposeDependency.js
new file mode 100644
index 00000000..8f6bfd01
--- /dev/null
+++ b/test/unit/data/composite/control-flow/exposeDependency.js
@@ -0,0 +1,64 @@
+import t from 'tap';
+
+import {compositeFrom, continuationSymbol, input} from '#composite';
+import {exposeDependency} from '#composite/control-flow';
+
+t.test(`exposeDependency: basic behavior`, t => {
+  t.plan(4);
+
+  const composite1 = compositeFrom({
+    compose: false,
+
+    steps: [
+      exposeDependency({dependency: 'foo'}),
+    ],
+  });
+
+  t.match(composite1, {
+    expose: {
+      dependencies: ['foo'],
+    },
+  });
+
+  t.equal(composite1.expose.compute({foo: 'bar'}), 'bar');
+
+  const composite2 = compositeFrom({
+    compose: false,
+
+    steps: [
+      {
+        dependencies: ['foo'],
+        compute: (continuation, {foo}) =>
+          continuation({'#bar': foo.toUpperCase()}),
+      },
+
+      exposeDependency({dependency: '#bar'}),
+    ],
+  });
+
+  t.match(composite2, {
+    expose: {
+      dependencies: ['foo'],
+    },
+  });
+
+  t.equal(composite2.expose.compute({foo: 'bar'}), 'BAR');
+});
+
+t.test(`exposeDependency: validate inputs`, t => {
+  t.plan(2);
+
+  t.throws(
+    () => exposeDependency({}),
+    {message: `Errors in input options passed to exposeDependency`, errors: [
+      {message: `Required these inputs: dependency`},
+    ]});
+
+  t.throws(
+    () => exposeDependency({
+      dependency: input.value('some static value'),
+    }),
+    {message: `Errors in input options passed to exposeDependency`, errors: [
+      {message: `dependency: Expected dependency name, got input.value() call`},
+    ]});
+});
diff --git a/test/unit/data/composite/control-flow/withResultOfAvailabilityCheck.js b/test/unit/data/composite/control-flow/withResultOfAvailabilityCheck.js
new file mode 100644
index 00000000..4c4be04a
--- /dev/null
+++ b/test/unit/data/composite/control-flow/withResultOfAvailabilityCheck.js
@@ -0,0 +1,173 @@
+import t from 'tap';
+
+import {compositeFrom, continuationSymbol, input} from '#composite';
+import {withResultOfAvailabilityCheck} from '#composite/control-flow';
+
+const composite = compositeFrom({
+  compose: false,
+
+  steps: [
+    withResultOfAvailabilityCheck({
+      from: 'from',
+      mode: 'mode',
+    }).outputs({
+      ['#availability']: '#result',
+    }),
+
+    {
+      dependencies: ['#result'],
+      compute: ({'#result': result}) => result,
+    },
+  ],
+});
+
+t.test(`withResultOfAvailabilityCheck: basic behavior`, t => {
+  t.plan(1);
+
+  t.match(composite, {
+    expose: {
+      dependencies: ['from', 'mode'],
+    },
+  });
+});
+
+const quickCompare = (t, expect, {from, mode}) =>
+  t.equal(composite.expose.compute({from, mode}), expect);
+
+const quickThrows = (t, {from, mode}) =>
+  t.throws(() => composite.expose.compute({from, mode}));
+
+t.test(`withResultOfAvailabilityCheck: mode = null`, t => {
+  t.plan(10);
+
+  quickCompare(t, true,  {mode: 'null', from: 'truthy string'});
+  quickCompare(t, true,  {mode: 'null', from: 123});
+  quickCompare(t, true,  {mode: 'null', from: true});
+
+  quickCompare(t, true,  {mode: 'null', from: ''});
+  quickCompare(t, true,  {mode: 'null', from: 0});
+  quickCompare(t, true,  {mode: 'null', from: false});
+
+  quickCompare(t, true,  {mode: 'null', from: [1, 2, 3]});
+  quickCompare(t, true,  {mode: 'null', from: []});
+
+  quickCompare(t, false, {mode: 'null', from: null});
+  quickCompare(t, false, {mode: 'null', from: undefined});
+});
+
+t.test(`withResultOfAvailabilityCheck: mode = empty`, t => {
+  t.plan(10);
+
+  quickThrows(t, {mode: 'empty', from: 'truthy string'});
+  quickThrows(t, {mode: 'empty', from: 123});
+  quickThrows(t, {mode: 'empty', from: true});
+
+  quickThrows(t, {mode: 'empty', from: ''});
+  quickThrows(t, {mode: 'empty', from: 0});
+  quickThrows(t, {mode: 'empty', from: false});
+
+  quickCompare(t, true,  {mode: 'empty', from: [1, 2, 3]});
+  quickCompare(t, false, {mode: 'empty', from: []});
+
+  quickCompare(t, false, {mode: 'empty', from: null});
+  quickCompare(t, false, {mode: 'empty', from: undefined});
+});
+
+t.test(`withResultOfAvailabilityCheck: mode = falsy`, t => {
+  t.plan(10);
+
+  quickCompare(t, true,  {mode: 'falsy', from: 'truthy string'});
+  quickCompare(t, true,  {mode: 'falsy', from: 123});
+  quickCompare(t, true,  {mode: 'falsy', from: true});
+
+  quickCompare(t, false, {mode: 'falsy', from: ''});
+  quickCompare(t, false, {mode: 'falsy', from: 0});
+  quickCompare(t, false, {mode: 'falsy', from: false});
+
+  quickCompare(t, true,  {mode: 'falsy', from: [1, 2, 3]});
+  quickCompare(t, false, {mode: 'falsy', from: []});
+
+  quickCompare(t, false, {mode: 'falsy', from: null});
+  quickCompare(t, false, {mode: 'falsy', from: undefined});
+});
+
+t.test(`withResultOfAvailabilityCheck: default mode`, t => {
+  t.plan(1);
+
+  const template = withResultOfAvailabilityCheck({
+    from: 'foo',
+  });
+
+  t.match(template.toDescription(), {
+    inputMapping: {
+      from: input.dependency('foo'),
+      mode: input.value('null'),
+    },
+  });
+});
+
+t.test(`withResultOfAvailabilityCheck: validate static inputs`, t => {
+  t.plan(5);
+
+  t.throws(
+    () => withResultOfAvailabilityCheck({}),
+    {message: `Errors in input options passed to withResultOfAvailabilityCheck`, errors: [
+      {message: `Required these inputs: from`},
+    ]});
+
+  t.doesNotThrow(() =>
+    withResultOfAvailabilityCheck({
+      from: 'dependency1',
+      mode: 'dependency2',
+    }));
+
+  t.doesNotThrow(() =>
+    withResultOfAvailabilityCheck({
+      from: input.value('some static value'),
+      mode: input.value('null'),
+    }));
+
+  t.throws(
+    () => withResultOfAvailabilityCheck({
+      from: 'foo',
+      mode: input.value('invalid'),
+    }),
+    {message: `Errors in input options passed to withResultOfAvailabilityCheck`, errors: [
+      {message: `mode: Expected one of null empty falsy, got invalid`},
+    ]});
+
+  t.throws(() =>
+    withResultOfAvailabilityCheck({
+      from: input.value(null),
+      mode: input.value(null),
+    }),
+    {message: `Errors in input options passed to withResultOfAvailabilityCheck`, errors: [
+      {message: `mode: Expected a value, got null`},
+    ]});
+});
+
+t.test(`withResultOfAvailabilityCheck: validate dynamic inputs`, t => {
+  t.plan(2);
+
+  t.throws(
+    () => composite.expose.compute({
+      from: 'apple',
+      mode: 'banana',
+    }),
+    {message: `Error computing composition`, cause:
+      {message: `Error computing composition withResultOfAvailabilityCheck`, cause:
+        {message: `Errors in input values provided to withResultOfAvailabilityCheck`, errors: [
+          {message: `mode: Expected one of null empty falsy, got banana`},
+        ]}}});
+
+  t.throws(
+    () => composite.expose.compute({
+      from: null,
+      mode: null,
+    }),
+    {message: `Error computing composition`, cause:
+      {message: `Error computing composition withResultOfAvailabilityCheck`, cause:
+        {message: `Errors in input values provided to withResultOfAvailabilityCheck`, errors: [
+          {message: `mode: Expected a value, got null`},
+        ]}}});
+});
diff --git a/test/unit/data/composite/data/withPropertiesFromObject.js b/test/unit/data/composite/data/withPropertiesFromObject.js
new file mode 100644
index 00000000..ead1b9b2
--- /dev/null
+++ b/test/unit/data/composite/data/withPropertiesFromObject.js
@@ -0,0 +1,248 @@
+import t from 'tap';
+
+import {compositeFrom, input} from '#composite';
+import {exposeDependency} from '#composite/control-flow';
+import {withPropertiesFromObject} from '#composite/data';
+
+const composite = compositeFrom({
+  compose: false,
+
+  steps: [
+    withPropertiesFromObject({
+      object: 'object',
+      properties: 'properties',
+    }),
+
+    exposeDependency({dependency: '#object'}),
+  ],
+});
+
+t.test(`withPropertiesFromObject: basic behavior`, t => {
+  t.plan(4);
+
+  t.match(composite, {
+    expose: {
+      dependencies: ['object', 'properties'],
+    },
+  });
+
+  t.same(
+    composite.expose.compute({
+      object: {foo: 'bar', bim: 'BOOM', bam: 'baz'},
+      properties: ['foo', 'bim'],
+    }),
+    {foo: 'bar', bim: 'BOOM'});
+
+  t.same(
+    composite.expose.compute({
+      object: {value1: 'uwah', value2: 'arah'},
+      properties: ['value1', 'value3'],
+    }),
+    {value1: 'uwah', value3: null});
+
+  t.same(
+    composite.expose.compute({
+      object: null,
+      properties: ['ohMe', 'ohMy', 'ohDear'],
+    }),
+    {ohMe: null, ohMy: null, ohDear: null});
+});
+
+t.test(`withPropertiesFromObject: output shapes & values`, t => {
+  t.plan(2 * 2 * 3 ** 2);
+
+  const dependencies = {
+    ['object_dependency']:
+      {foo: 'apple', bar: 'banana', baz: 'orange'},
+    [input('object_neither')]:
+      {foo: 'koala', bar: 'okapi', baz: 'mongoose'},
+    ['properties_dependency']:
+      ['foo', 'bar', 'missing1'],
+    [input('properties_neither')]:
+      ['foo', 'baz', 'missing3'],
+  };
+
+  const mapLevel1 = [
+    [input.value('prefix_value'), [
+      ['object_dependency', [
+        ['properties_dependency', {
+          '#object': {foo: 'apple', bar: 'banana', missing1: null},
+        }],
+        [input.value(['bar', 'baz', 'missing2']), {
+          '#prefix_value.bar': 'banana',
+          '#prefix_value.baz': 'orange',
+          '#prefix_value.missing2': null,
+        }],
+        [input('properties_neither'), {
+          '#object': {foo: 'apple', baz: 'orange', missing3: null},
+        }]]],
+
+      [input.value({foo: 'ouh', bar: 'rah', baz: 'nyu'}), [
+        ['properties_dependency', {
+          '#object': {foo: 'ouh', bar: 'rah', missing1: null},
+        }],
+        [input.value(['bar', 'baz', 'missing2']), {
+          '#prefix_value.bar': 'rah',
+          '#prefix_value.baz': 'nyu',
+          '#prefix_value.missing2': null,
+        }],
+        [input('properties_neither'), {
+          '#object': {foo: 'ouh', baz: 'nyu', missing3: null},
+        }]]],
+
+      [input('object_neither'), [
+        ['properties_dependency', {
+          '#object': {foo: 'koala', bar: 'okapi', missing1: null},
+        }],
+        [input.value(['bar', 'baz', 'missing2']), {
+          '#prefix_value.bar': 'okapi',
+          '#prefix_value.baz': 'mongoose',
+          '#prefix_value.missing2': null,
+        }],
+        [input('properties_neither'), {
+          '#object': {foo: 'koala', baz: 'mongoose', missing3: null},
+        }]]]]],
+
+    [input.value(null), [
+      ['object_dependency', [
+        ['properties_dependency', {
+          '#object': {foo: 'apple', bar: 'banana', missing1: null},
+        }],
+        [input.value(['bar', 'baz', 'missing2']), {
+          '#object_dependency.bar': 'banana',
+          '#object_dependency.baz': 'orange',
+          '#object_dependency.missing2': null,
+        }],
+        [input('properties_neither'), {
+          '#object': {foo: 'apple', baz: 'orange', missing3: null},
+        }]]],
+
+      [input.value({foo: 'ouh', bar: 'rah', baz: 'nyu'}), [
+        ['properties_dependency', {
+          '#object': {foo: 'ouh', bar: 'rah', missing1: null},
+        }],
+        [input.value(['bar', 'baz', 'missing2']), {
+          '#object.bar': 'rah',
+          '#object.baz': 'nyu',
+          '#object.missing2': null,
+        }],
+        [input('properties_neither'), {
+          '#object': {foo: 'ouh', baz: 'nyu', missing3: null},
+        }]]],
+
+      [input('object_neither'), [
+        ['properties_dependency', {
+          '#object': {foo: 'koala', bar: 'okapi', missing1: null},
+        }],
+        [input.value(['bar', 'baz', 'missing2']), {
+          '#object.bar': 'okapi',
+          '#object.baz': 'mongoose',
+          '#object.missing2': null,
+        }],
+        [input('properties_neither'), {
+          '#object': {foo: 'koala', baz: 'mongoose', missing3: null},
+        }]]]]],
+  ];
+
+  for (const [prefixInput, mapLevel2] of mapLevel1) {
+    for (const [objectInput, mapLevel3] of mapLevel2) {
+      for (const [propertiesInput, outputDict] of mapLevel3) {
+        const step = withPropertiesFromObject({
+          prefix: prefixInput,
+          object: objectInput,
+          properties: propertiesInput,
+        });
+
+        quickCheckOutputs(step, outputDict);
+      }
+    }
+  }
+
+  function quickCheckOutputs(step, outputDict) {
+    t.same(
+      Object.keys(step.toDescription().outputs),
+      Object.keys(outputDict));
+
+    const composite = compositeFrom({
+      compose: false,
+      steps: [step, {
+        dependencies: Object.keys(outputDict),
+        compute: dependencies => dependencies,
+      }],
+    });
+
+    t.same(
+      composite.expose.compute(dependencies),
+      outputDict);
+  }
+});
+
+t.test(`withPropertiesFromObject: validate static inputs`, t => {
+  t.plan(3);
+
+  t.throws(
+    () => withPropertiesFromObject({}),
+    {message: `Errors in input options passed to withPropertiesFromObject`, errors: [
+      {message: `Required these inputs: object, properties`},
+    ]});
+
+  t.throws(
+    () => withPropertiesFromObject({
+      object: input.value('intriguing'),
+      properties: input.value('very'),
+      prefix: input.value({yes: 'yup'}),
+    }),
+    {message: `Errors in input options passed to withPropertiesFromObject`, errors: [
+      {message: `object: Expected an object, got string`},
+      {message: `properties: Expected an array, got string`},
+      {message: `prefix: Expected a string, got object`},
+    ]});
+
+  t.throws(
+    () => withPropertiesFromObject({
+      object: input.value([['abc', 1], ['def', 2], [123, 3]]),
+      properties: input.value(['abc', 'def', 123]),
+    }),
+    {message: `Errors in input options passed to withPropertiesFromObject`, errors: [
+      {message: `object: Expected an object, got array`},
+      {message: `properties: Errors validating array items`, errors: [
+        {
+          [Symbol.for('hsmusic.decorate.indexInSourceArray')]: 2,
+          message: /Expected a string, got number/,
+        },
+      ]},
+    ]});
+});
+
+t.test(`withPropertiesFromObject: validate dynamic inputs`, t => {
+  t.plan(2);
+
+  t.throws(
+    () => composite.expose.compute({
+      object: 'intriguing',
+      properties: 'onceMore',
+    }),
+    {message: `Error computing composition`, cause:
+      {message: `Error computing composition withPropertiesFromObject`, cause:
+        {message: `Errors in input values provided to withPropertiesFromObject`, errors: [
+          {message: `object: Expected an object, got string`},
+          {message: `properties: Expected an array, got string`},
+        ]}}});
+
+  t.throws(
+    () => composite.expose.compute({
+      object: [['abc', 1], ['def', 2], [123, 3]],
+      properties: ['abc', 'def', 123],
+    }),
+    {message: `Error computing composition`, cause:
+      {message: `Error computing composition withPropertiesFromObject`, cause:
+        {message: `Errors in input values provided to withPropertiesFromObject`, errors: [
+          {message: `object: Expected an object, got array`},
+          {message: `properties: Errors validating array items`, errors: [
+            {
+              [Symbol.for('hsmusic.decorate.indexInSourceArray')]: 2,
+              message: /Expected a string, got number/,
+            },
+          ]},
+        ]}}});
+});
diff --git a/test/unit/data/composite/data/withPropertyFromObject.js b/test/unit/data/composite/data/withPropertyFromObject.js
new file mode 100644
index 00000000..6a772c36
--- /dev/null
+++ b/test/unit/data/composite/data/withPropertyFromObject.js
@@ -0,0 +1,122 @@
+import t from 'tap';
+
+import {compositeFrom, input} from '#composite';
+import {exposeDependency} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+t.test(`withPropertyFromObject: basic behavior`, t => {
+  t.plan(4);
+
+  const composite = compositeFrom({
+    compose: false,
+
+    steps: [
+      withPropertyFromObject({
+        object: 'object',
+        property: 'property',
+      }),
+
+      exposeDependency({dependency: '#value'}),
+    ],
+  });
+
+  t.match(composite, {
+    expose: {
+      dependencies: ['object', 'property'],
+    },
+  });
+
+  t.equal(composite.expose.compute({
+    object: {foo: 'bar', bim: 'BOOM'},
+    property: 'bim',
+  }), 'BOOM');
+
+  t.equal(composite.expose.compute({
+    object: {value1: 'uwah'},
+    property: 'value2',
+  }), null);
+
+  t.equal(composite.expose.compute({
+    object: null,
+    property: 'oml where did me object go',
+  }), null);
+});
+
+t.test(`withPropertyFromObject: output shapes & values`, t => {
+  t.plan(2 * 3 ** 2);
+
+  const dependencies = {
+    ['object_dependency']:
+      {foo: 'apple', bar: 'banana', baz: 'orange'},
+    [input('object_neither')]:
+      {foo: 'koala', bar: 'okapi', baz: 'mongoose'},
+    ['property_dependency']:
+      'foo',
+    [input('property_neither')]:
+      'baz',
+  };
+
+  const mapLevel1 = [
+    ['object_dependency', [
+      ['property_dependency', {
+        '#value': 'apple',
+      }],
+      [input.value('bar'), {
+        '#object_dependency.bar': 'banana',
+      }],
+      [input('property_neither'), {
+        '#value': 'orange',
+      }]]],
+
+    [input.value({foo: 'ouh', bar: 'rah', baz: 'nyu'}), [
+      ['property_dependency', {
+        '#value': 'ouh',
+      }],
+      [input.value('bar'), {
+        '#value': 'rah',
+      }],
+      [input('property_neither'), {
+        '#value': 'nyu',
+      }]]],
+
+    [input('object_neither'), [
+      ['property_dependency', {
+        '#value': 'koala',
+      }],
+      [input.value('bar'), {
+        '#value': 'okapi',
+      }],
+      [input('property_neither'), {
+        '#value': 'mongoose',
+      }]]],
+  ];
+
+  for (const [objectInput, mapLevel2] of mapLevel1) {
+    for (const [propertyInput, outputDict] of mapLevel2) {
+      const step = withPropertyFromObject({
+        object: objectInput,
+        property: propertyInput,
+      });
+
+      quickCheckOutputs(step, outputDict);
+    }
+  }
+
+  function quickCheckOutputs(step, outputDict) {
+    t.same(
+      Object.keys(step.toDescription().outputs),
+      Object.keys(outputDict));
+
+    const composite = compositeFrom({
+      compose: false,
+      steps: [step, {
+        dependencies: Object.keys(outputDict),
+        compute: dependencies => dependencies,
+      }],
+    });
+
+    t.same(
+      composite.expose.compute(dependencies),
+      outputDict);
+  }
+});
-- 
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