1 files changed, 135 insertions, 0 deletions
diff --git a/toolkit/modules/tests/browser/browser_Deprecated.js b/toolkit/modules/tests/browser/browser_Deprecated.js
new file mode 100644
index 0000000000..0f0645527f
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+++ b/toolkit/modules/tests/browser/browser_Deprecated.js
@@ -0,0 +1,135 @@
+/* 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/. */
+
+const PREF_DEPRECATION_WARNINGS = "devtools.errorconsole.deprecation_warnings";
+
+const { Deprecated } = ChromeUtils.importESModule(
+  "resource://gre/modules/Deprecated.sys.mjs"
+);
+
+// Using this named functions to test deprecation and the properly logged
+// callstacks.
+function basicDeprecatedFunction() {
+  Deprecated.warning("this method is deprecated.", "https://example.com");
+  return true;
+}
+
+function deprecationFunctionBogusCallstack() {
+  Deprecated.warning("this method is deprecated.", "https://example.com", {
+    caller: {},
+  });
+  return true;
+}
+
+function deprecationFunctionCustomCallstack() {
+  // Get the nsIStackFrame that will contain the name of this function.
+  function getStack() {
+    return Components.stack;
+  }
+  Deprecated.warning(
+    "this method is deprecated.",
+    "https://example.com",
+    getStack()
+  );
+  return true;
+}
+
+var tests = [
+  // Test deprecation warning without passing the callstack.
+  {
+    deprecatedFunction: basicDeprecatedFunction,
+    expectedObservation(aMessage) {
+      testAMessage(aMessage);
+      ok(
+        aMessage.indexOf("basicDeprecatedFunction") > 0,
+        "Callstack is correctly logged."
+      );
+    },
+  },
+  // Test a reported error when URL to documentation is not passed.
+  {
+    deprecatedFunction() {
+      Deprecated.warning("this method is deprecated.");
+      return true;
+    },
+    expectedObservation(aMessage) {
+      ok(
+        aMessage.indexOf("must provide a URL") > 0,
+        "Deprecation warning logged an empty URL argument."
+      );
+    },
+  },
+  // Test deprecation with a bogus callstack passed as an argument (it will be
+  // replaced with the current call stack).
+  {
+    deprecatedFunction: deprecationFunctionBogusCallstack,
+    expectedObservation(aMessage) {
+      testAMessage(aMessage);
+      ok(
+        aMessage.indexOf("deprecationFunctionBogusCallstack") > 0,
+        "Callstack is correctly logged."
+      );
+    },
+  },
+  // Test deprecation with a valid custom callstack passed as an argument.
+  {
+    deprecatedFunction: deprecationFunctionCustomCallstack,
+    expectedObservation(aMessage) {
+      testAMessage(aMessage);
+      ok(
+        aMessage.indexOf("deprecationFunctionCustomCallstack") > 0,
+        "Callstack is correctly logged."
+      );
+    },
+    // Set pref to true.
+    logWarnings: true,
+  },
+];
+
+// Test Console Message attributes.
+function testAMessage(aMessage) {
+  ok(
+    aMessage.indexOf("DEPRECATION WARNING: this method is deprecated.") === 0,
+    "Deprecation is correctly logged."
+  );
+  ok(aMessage.indexOf("https://example.com") > 0, "URL is correctly logged.");
+}
+
+add_task(async function test_setup() {
+  Services.prefs.setBoolPref(PREF_DEPRECATION_WARNINGS, true);
+
+  // Check if Deprecated is loaded.
+  ok(Deprecated, "Deprecated object exists");
+});
+
+add_task(async function test_pref_enabled() {
+  for (let [idx, test] of tests.entries()) {
+    info("Running test #" + idx);
+
+    let promiseObserved = TestUtils.consoleMessageObserved(subject => {
+      let msg = subject.wrappedJSObject.arguments?.[0];
+      return (
+        msg.includes("DEPRECATION WARNING: ") ||
+        msg.includes("must provide a URL")
+      );
+    });
+
+    test.deprecatedFunction();
+
+    let msg = await promiseObserved;
+
+    test.expectedObservation(msg.wrappedJSObject.arguments?.[0]);
+  }
+});
+
+add_task(async function test_pref_disabled() {
+  // Deprecation warnings will be logged only when the preference is set.
+  Services.prefs.setBoolPref(PREF_DEPRECATION_WARNINGS, false);
+
+  let endFn = TestUtils.listenForConsoleMessages();
+  basicDeprecatedFunction();
+
+  let messages = await endFn();
+  Assert.equal(messages.length, 0, "Should not have received any messages");
+});