diff --git a/src/utils/tests/assert.js b/src/utils/tests/assert.js
new file mode 100644
index 0000000000..cef48dcbd5
--- /dev/null
+++ b/src/utils/tests/assert.js
@@ -0,0 +1,42 @@
+import assert from "../assert.js";
+
+let testAssertMessageHead, testAssertMessage;
+
+describe("assert", () => {
+  beforeEach(() => {
+    testAssertMessageHead = "Assertion failure: ";
+    testAssertMessage = "Test assert.js Message";
+  });
+
+  describe("when isDevelopment and the condition is truthy", () => {
+    it("does not throw an Error", () => {
+      expect(() => {
+        assert(true, testAssertMessage);
+      }).not.toThrow();
+    });
+  });
+
+  describe("when isDevelopment and the condition is falsy", () => {
+    it("throws an Error displaying the passed message", () => {
+      expect(() => {
+        assert(false, testAssertMessage);
+      }).toThrow(new Error(testAssertMessageHead + testAssertMessage));
+    });
+  });
+
+  describe("when not isDevelopment", () => {
+    beforeEach(() => {
+      process.env.NODE_ENV = "production";
+    });
+
+    afterEach(() => {
+      delete process.env.NODE_ENV;
+    });
+
+    it("does not throw an Error", () => {
+      expect(() => {
+        assert(false, testAssertMessage);
+      }).not.toThrow();
+    });
+  });
+});