1 files changed, 52 insertions, 0 deletions
diff --git a/test/unit/data/composite/common-utilities/exposeConstant.js b/test/unit/data/composite/common-utilities/exposeConstant.js
new file mode 100644
index 00000000..829dc706
--- /dev/null
+++ b/test/unit/data/composite/common-utilities/exposeConstant.js
@@ -0,0 +1,52 @@
+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`},
+      ],
+    });
+});