data, test: exposeConstant, withResultOfAvailabilityCheck

1 files changed, 60 insertions, 0 deletions

diff --git a/test/unit/data/composite/exposeConstant.js b/test/unit/data/composite/exposeConstant.js
new file mode 100644
index 00000000..ce3f5e3d
--- /dev/null
+++ b/test/unit/data/composite/exposeConstant.js
@@ -0,0 +1,60 @@
+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);
+
+  let caughtError;
+
+  try {
+    caughtError = null;
+    exposeConstant({});
+  } catch (error) {
+    caughtError = error;
+  }
+
+  t.match(caughtError, {
+    errors: [/Required these inputs: value/],
+  });
+
+  try {
+    caughtError = null;
+    exposeConstant({
+      value: 'some dependency',
+    });
+  } catch (error) {
+    caughtError = error;
+  }
+
+  t.match(caughtError, {
+    errors: [/Expected static values: value/],
+  });
+});