In the new Android x86 emulator test environment, testReaderMode frequently fails: https://tbpl.mozilla.org/php/getParsedLog.php?id=30292215&tree=Cedar&full=1#error14 14:05:21 INFO - 12 INFO TEST-PASS | testReaderMode | Checking that the correct tab is displayed - The HISTORY tab is displayed 14:05:21 INFO - 13 INFO TEST-PASS | testReaderMode | Checking that we are in the most recent tab of about:home - We are in the most recent tab 14:05:21 INFO - 14 INFO TEST-PASS | testReaderMode | item can be retrieved - android.widget.TextView{b351f6b8 V.ED.... ........ 32,32-466,64} 14:05:21 INFO - 15 INFO TEST-UNEXPECTED-FAIL | testReaderMode | Verify if the page is present in history as a Reading List item - The page is present in history as a Reading List item 14:05:21 INFO - Exception caught during test! 14:05:21 INFO - junit.framework.AssertionFailedError: 15 INFO TEST-UNEXPECTED-FAIL | testReaderMode | Verify if the page is present in history as a Reading List item - The page is present in history as a Reading List item 14:05:21 INFO - at junit.framework.Assert.fail(Assert.java:50) 14:05:21 INFO - at org.mozilla.fennec.FennecMochitestAssert._logMochitestResult(FennecMochitestAssert.java:111) 14:05:21 INFO - at org.mozilla.fennec.FennecMochitestAssert.ok(FennecMochitestAssert.java:140) 14:05:21 INFO - at org.mozilla.fennec.tests.testReaderMode.testReaderMode(testReaderMode.java:118) 14:05:21 INFO - at java.lang.reflect.Method.invokeNative(Native Method) 14:05:21 INFO - at java.lang.reflect.Method.invoke(Method.java:511) 14:05:21 INFO - at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214) 14:05:21 INFO - at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199) 14:05:21 INFO - at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192) 14:05:21 INFO - at org.mozilla.fennec.tests.BaseTest.runTest(BaseTest.java:151) 14:05:21 INFO - at junit.framework.TestCase.runBare(TestCase.java:134) 14:05:21 INFO - at junit.framework.TestResult$1.protect(TestResult.java:115) 14:05:21 INFO - at junit.framework.TestResult.runProtected(TestResult.java:133) 14:05:21 INFO - at junit.framework.TestResult.run(TestResult.java:118) 14:05:21 INFO - at junit.framework.TestCase.run(TestCase.java:124) 14:05:21 INFO - at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190) 14:05:21 INFO - at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175) 14:05:21 INFO - at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555) 14:05:21 INFO - at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1661) 14:05:21 INFO - 16 INFO TEST-UNEXPECTED-FAIL | testReaderMode | Exception caught - junit.framework.AssertionFailedError: 15 INFO TEST-UNEXPECTED-FAIL | testReaderMode | Verify if the page is present in history as a Reading List item - The page is present in history as a Reading List item 14:05:21 INFO - 17 INFO TEST-END | testReaderMode | finished in 60571ms

Disabled in bug 936226.

I removed testReaderMode in bug 1158885, so this isn't an issue anymore.