diff -r 000000000000 -r 6474c204b198 browser/devtools/commandline/test/browser_cmd_media.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/commandline/test/browser_cmd_media.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,86 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that screenshot command works properly
+const TEST_URI = "http://example.com/browser/browser/devtools/commandline/" +
+                 "test/browser_cmd_media.html";
+let tests = {
+  testInput: function(options) {
+    return helpers.audit(options, [
+      {
+        setup: "media emulate braille",
+        check: {
+          input:  "media emulate braille",
+          markup: "VVVVVVVVVVVVVVVVVVVVV",
+          status: "VALID",
+          args: {
+            type: { value: "braille"},
+          }
+        },
+      },
+      {
+        setup: "media reset",
+        check: {
+          input:  "media reset",
+          markup: "VVVVVVVVVVV",
+          status: "VALID",
+          args: {
+          }
+        },
+      },
+    ]);
+  },
+
+  testEmulateMedia: function(options) {
+    return helpers.audit(options, [
+      {
+        setup: "media emulate braille",
+        check: {
+          args: {
+            type: { value: "braille"}
+          }
+        },
+        exec: {
+          output: ""
+        },
+        post: function() {
+          let body = options.window.document.body;
+          let style = options.window.getComputedStyle(body);
+          is(style.backgroundColor, "rgb(255, 255, 0)", "media correctly emulated");
+        }
+      }
+    ]);
+  },
+
+  testEndMediaEmulation: function(options) {
+    return helpers.audit(options, [
+      {
+        setup: function() {
+          let mDV = options.browser.markupDocumentViewer;
+          mDV.emulateMedium("embossed");
+          return helpers.setInput(options, "media reset");
+        },
+        exec: {
+          output: ""
+        },
+        post: function() {
+          let body = options.window.document.body;
+          let style = options.window.getComputedStyle(body);
+          is(style.backgroundColor, "rgb(255, 255, 255)", "media reset");
+        }
+      }
+    ]);
+  }
+};
+
+function test() {
+  return Task.spawn(function() {
+    let options = yield helpers.openTab(TEST_URI);
+    yield helpers.openToolbar(options);
+
+    yield helpers.runTests(options, tests);
+
+    yield helpers.closeToolbar(options);
+    yield helpers.closeTab(options);
+  }).then(finish, helpers.handleError);
+}