1 files changed, 30 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/tests/assert.spec.js b/devtools/client/debugger/src/utils/tests/assert.spec.js
new file mode 100644
index 0000000000..031665c5d3
--- /dev/null
+++ b/devtools/client/debugger/src/utils/tests/assert.spec.js
@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import assert from "../assert.js";
+
+let testAssertMessageHead, testAssertMessage;
+
+describe("assert", () => {
+  beforeEach(() => {
+    testAssertMessageHead = "Assertion failure: ";
+    testAssertMessage = "Test assert.js Message";
+  });
+
+  describe("when condition is truthy", () => {
+    it("does not throw an Error", () => {
+      expect(() => {
+        assert(true, testAssertMessage);
+      }).not.toThrow();
+    });
+  });
+
+  describe("when condition is falsy", () => {
+    it("throws an Error displaying the passed message", () => {
+      expect(() => {
+        assert(false, testAssertMessage);
+      }).toThrow(new Error(testAssertMessageHead + testAssertMessage));
+    });
+  });
+});