1 files changed, 50 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/node/utils/areMessagesSimilar.test.js b/devtools/client/webconsole/test/node/utils/areMessagesSimilar.test.js
new file mode 100644
index 0000000000..23d3bae986
--- /dev/null
+++ b/devtools/client/webconsole/test/node/utils/areMessagesSimilar.test.js
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+const {
+  areMessagesSimilar,
+} = require("resource://devtools/client/webconsole/utils/messages.js");
+const {
+  stubPreparedMessages,
+} = require("resource://devtools/client/webconsole/test/node/fixtures/stubs/index.js");
+
+const expect = require("expect");
+
+describe("areMessagesSimilar:", () => {
+  it("returns true for duplicated messages", () => {
+    const baseMessage = stubPreparedMessages.get(
+      "console.log('foobar', 'test')"
+    );
+
+    // Repeat ID must be the same even if the timestamp is different.
+    const message1 = Object.assign({}, baseMessage, { timeStamp: 1 });
+    const message2 = Object.assign({}, baseMessage, { timeStamp: 2 });
+
+    expect(areMessagesSimilar(message1, message2)).toEqual(true);
+  });
+
+  it("returns false for different messages", () => {
+    const message1 = stubPreparedMessages.get("console.log('foobar', 'test')");
+    const message2 = Object.assign({}, message1, {
+      parameters: ["funny", "monkey"],
+    });
+    expect(areMessagesSimilar(message1, message2)).toEqual(false);
+  });
+
+  it("returns false for messages with different severities", () => {
+    const message1 = stubPreparedMessages.get("console.log('foobar', 'test')");
+    const message2 = Object.assign({}, message1, { level: "error" });
+    expect(areMessagesSimilar(message1, message2)).toEqual(false);
+  });
+
+  it("return false for messages with different falsy values", () => {
+    const messageNaN = stubPreparedMessages.get("console.log(NaN)");
+    const messageUnd = stubPreparedMessages.get("console.log(undefined)");
+    const messageNul = stubPreparedMessages.get("console.log(null)");
+
+    expect(areMessagesSimilar(messageNaN, messageUnd)).toEqual(false);
+    expect(areMessagesSimilar(messageUnd, messageNul)).toEqual(false);
+    expect(areMessagesSimilar(messageNul, messageNaN)).toEqual(false);
+  });
+});