Unit tests for combination test results.

This is follow up to the CL
https://chromium.googlesource.com/chromium/src.git/+/c26b06c7500c2ecf63b138ed893edf3c89faad77

Bug: 1050838
Change-Id: I48ce1674a96ede2bfc9b66293195c7eaac6b5e7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2194483Reviewed-by: Rakib Hasan <rmhasan@google.com>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769023}

third_party/blink/tools/blinkpy/web_tests/models/test_results_unittest.py

@@ -62,3 +62,18 @@ class TestResultsTest(unittest.TestCase):
         failures = [test_failures.FailureTextMismatch(driver_output, None)]
         result = TestResult('foo', failures=failures)
         self.assertTrue(result.has_repaint_overlay)
+
+    def test_results_multiple(self):
+        driver_output = DriverOutput(None, None, None, None)
+        failure_crash = [test_failures.FailureCrash(driver_output, None),
+                    test_failures.TestFailure(driver_output, None)]
+        failure_timeout = [test_failures.FailureTimeout(driver_output, None),
+                    test_failures.TestFailure(driver_output, None)]
+        failure_early_exit = [test_failures.FailureEarlyExit(driver_output, None),
+                    test_failures.TestFailure(driver_output, None)]
+        # Should not raise an exception for CRASH and FAIL.
+        TestResult('foo', failures=failure_crash)
+        # Should not raise an exception for TIMEOUT and FAIL.
+        TestResult('foo', failures=failure_timeout)
+        with self.assertRaises(AssertionError):
+            TestResult('foo', failures=failure_early_exit)
\ No newline at end of file