1 files changed, 124 insertions, 0 deletions
diff --git a/test/unit/data/composite/common-utilities/withPropertyFromObject.js b/test/unit/data/composite/common-utilities/withPropertyFromObject.js
new file mode 100644
index 00000000..c0e3dccf
--- /dev/null
+++ b/test/unit/data/composite/common-utilities/withPropertyFromObject.js
@@ -0,0 +1,124 @@
+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(3 * 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 map = [
+    ['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, submap] of map) {
+    for (const [propertyInput, dict] of submap) {
+      const step = withPropertyFromObject({
+        object: objectInput,
+        property: propertyInput,
+      });
+
+      t.same(
+        Object.keys(step.toDescription().outputs),
+        Object.keys(dict));
+
+      const composite = compositeFrom({
+        compose: false,
+
+        steps: [
+          step,
+
+          {
+            dependencies: Object.keys(dict),
+            compute: dependencies => dependencies,
+          },
+        ],
+      });
+
+      t.same(composite.expose.compute(dependencies), dict);
+    }
+  }
+});