diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_repeated_messages_accuracy.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_repeated_messages_accuracy.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,118 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// Test that makes sure messages are not considered repeated when coming from
+// different lines of code, or from different severities, etc.
+// See bugs 720180 and 800510.
+
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-repeated-messages.html";
+
+function test() {
+  const PREF = "devtools.webconsole.persistlog";
+  Services.prefs.setBoolPref(PREF, true);
+  registerCleanupFunction(() => Services.prefs.clearUserPref(PREF));
+
+  addTab(TEST_URI);
+  browser.addEventListener("load", function onLoad() {
+    browser.removeEventListener("load", onLoad, true);
+    openConsole(null, consoleOpened);
+  }, true);
+}
+
+function consoleOpened(hud) {
+  // Check that css warnings are not coalesced if they come from different lines.
+  info("waiting for 2 css warnings");
+
+  waitForMessages({
+    webconsole: hud,
+    messages: [{
+      name: "two css warnings",
+      category: CATEGORY_CSS,
+      count: 2,
+      repeats: 1,
+    }],
+  }).then(testCSSRepeats.bind(null, hud));
+}
+
+function testCSSRepeats(hud) {
+  browser.addEventListener("load", function onLoad() {
+    browser.removeEventListener("load", onLoad, true);
+
+    info("wait for repeats after page reload");
+
+    waitForMessages({
+      webconsole: hud,
+      messages: [{
+        name: "two css warnings, repeated twice",
+        category: CATEGORY_CSS,
+        repeats: 2,
+        count: 2,
+      }],
+    }).then(testCSSRepeatsAfterReload.bind(null, hud));
+  }, true);
+  content.location.reload();
+}
+
+function testCSSRepeatsAfterReload(hud) {
+  hud.jsterm.clearOutput(true);
+  content.wrappedJSObject.testConsole();
+
+  info("wait for repeats with the console API");
+
+  waitForMessages({
+    webconsole: hud,
+    messages: [
+      {
+        name: "console.log 'foo repeat' repeated twice",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_LOG,
+        repeats: 2,
+      },
+      {
+        name: "console.log 'foo repeat' repeated once",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_LOG,
+        repeats: 1,
+      },
+      {
+        name: "console.error 'foo repeat' repeated once",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_ERROR,
+        repeats: 1,
+      },
+    ],
+  }).then(testConsoleRepeats.bind(null, hud));
+}
+
+function testConsoleRepeats(hud) {
+  hud.jsterm.clearOutput(true);
+  hud.jsterm.execute("undefined");
+  content.console.log("undefined");
+
+  info("make sure console API messages are not coalesced with jsterm output");
+
+  waitForMessages({
+    webconsole: hud,
+    messages: [
+      {
+        name: "'undefined' jsterm input message",
+        text: "undefined",
+        category: CATEGORY_INPUT,
+      },
+      {
+        name: "'undefined' jsterm output message",
+        text: "undefined",
+        category: CATEGORY_OUTPUT,
+      },
+      {
+        name: "'undefined' console.log message",
+        text: "undefined",
+        category: CATEGORY_WEBDEV,
+        repeats: 1,
+      },
+    ],
+  }).then(finishTest);
+}