1 files changed, 42 insertions, 0 deletions
diff --git a/devtools/shared/tests/xpcshell/test_assert.js b/devtools/shared/tests/xpcshell/test_assert.js
new file mode 100644
index 0000000000..45ae9eb1a2
--- /dev/null
+++ b/devtools/shared/tests/xpcshell/test_assert.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test DevToolsUtils.assert
+
+ALLOW_CONSOLE_ERRORS = true;
+
+function run_test() {
+  const { assert } = DevToolsUtils;
+  equal(typeof assert, "function");
+
+  try {
+    assert(true, "this assertion should not fail");
+  } catch (e) {
+    // If you catch assertion failures in practice, I will hunt you down. I get
+    // email notifications every time it happens.
+    ok(
+      false,
+      "Should not get an error for an assertion that should not fail. Got " +
+        DevToolsUtils.safeErrorString(e)
+    );
+  }
+
+  let assertionFailed = false;
+  try {
+    assert(false, "this assertion should fail");
+  } catch (e) {
+    ok(
+      e.message.startsWith("Assertion failure:"),
+      "Should be an assertion failure error"
+    );
+    assertionFailed = true;
+  }
+
+  ok(
+    assertionFailed,
+    "The assertion should have failed, which should throw an error when assertions " +
+      "are enabled."
+  );
+}