1 files changed, 49 insertions, 0 deletions
diff --git a/devtools/shared/network-observer/test/browser/browser_networkobserver_invalid_constructor.js b/devtools/shared/network-observer/test/browser/browser_networkobserver_invalid_constructor.js
new file mode 100644
index 0000000000..76a93d938a
--- /dev/null
+++ b/devtools/shared/network-observer/test/browser/browser_networkobserver_invalid_constructor.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check that the NetworkObserver constructor validates its arguments.
+add_task(async function testInvalidConstructorArguments() {
+  Assert.throws(
+    () => new NetworkObserver(),
+    /Expected "ignoreChannelFunction" to be a function, got undefined/,
+    "NetworkObserver constructor should throw if no argument was provided"
+  );
+
+  Assert.throws(
+    () => new NetworkObserver({}),
+    /Expected "ignoreChannelFunction" to be a function, got undefined/,
+    "NetworkObserver constructor should throw if ignoreChannelFunction was not provided"
+  );
+
+  const invalidValues = [null, true, false, 12, "str", ["arr"], { obj: "obj" }];
+  for (const invalidValue of invalidValues) {
+    Assert.throws(
+      () => new NetworkObserver({ ignoreChannelFunction: invalidValue }),
+      /Expected "ignoreChannelFunction" to be a function, got/,
+      `NetworkObserver constructor should throw if a(n) ${typeof invalidValue} was provided for ignoreChannelFunction`
+    );
+  }
+
+  const EMPTY_FN = () => {};
+  Assert.throws(
+    () => new NetworkObserver({ ignoreChannelFunction: EMPTY_FN }),
+    /Expected "onNetworkEvent" to be a function, got undefined/,
+    "NetworkObserver constructor should throw if onNetworkEvent was not provided"
+  );
+
+  // Now we will pass a function for `ignoreChannelFunction`, and will do the
+  // same tests for onNetworkEvent
+  for (const invalidValue of invalidValues) {
+    Assert.throws(
+      () =>
+        new NetworkObserver({
+          ignoreChannelFunction: EMPTY_FN,
+          onNetworkEvent: invalidValue,
+        }),
+      /Expected "onNetworkEvent" to be a function, got/,
+      `NetworkObserver constructor should throw if a(n) ${typeof invalidValue} was provided for onNetworkEvent`
+    );
+  }
+});