Fixing flaky tests

testng-core/src/test/java/test/listeners/issue2916/ElaborateSampleTestCase.java

@@ -23,8 +23,9 @@ public void flakyTest() {
     }
   }
 
-  @Test(timeOut = 2, priority = 4)
+  @Test(timeOut = 25, priority = 4)
   public void timingOutTest() throws InterruptedException {
-    TimeUnit.MILLISECONDS.sleep(10);
+    TimeUnit.SECONDS.sleep(10);
+    Assert.fail();
   }
 }

testng-core/src/test/java/test/thread/issue188/Issue188TestSample.java

@@ -37,9 +37,17 @@ public void anotherSampleTest() {
 
   private void sleepSilently() {
     try {
-      TimeUnit.MILLISECONDS.sleep(500 * random.nextInt(10));
+      TimeUnit.MILLISECONDS.sleep(500 * random());
     } catch (InterruptedException e) {
       Thread.currentThread().interrupt();
     }
   }
+
+  private static long random() {
+    int value = random.nextInt(10);
+    if (value == 0) {
+      return 1;
+    }
+    return value;
+  }
 }

testng-core/src/test/java/test/thread/issue188/IssueTest.java

@@ -40,17 +40,20 @@ public void testSuiteLevelParallelMode() {
         String allTimeStamps =
             keyset.stream().map(Objects::toString).collect(Collectors.joining(","));
         long prev = keyset.get(0);
+        int permissibleLag = 40;
         for (int i = 1; i < keyset.size(); i++) {
           long current = keyset.get(i);
           long diff = current - prev;
           Assertions.assertThat(diff)
               .withFailMessage(
-                  "Test methods should have started within a lag of max 40 ms but it was "
+                  "Test methods should have started within a lag of max "
+                      + permissibleLag
+                      + " ms but it was "
                       + diff
                       + " ms ["
                       + allTimeStamps
                       + "]")
-              .isLessThanOrEqualTo(40);
+              .isLessThanOrEqualTo(permissibleLag);
           prev = current;
         }
       }

testng-test-osgi/src/test/java/org/testng/test/osgi/PlainOsgiTest.java

@@ -25,7 +25,9 @@ public Option[] config() {
     return options(defaultTestngOsgiOptions());
   }
 
-  @Test
+  // TODO: Enable this test once the PR https://github.com/ops4j/org.ops4j.pax.exam2/pull/1112
+  // gets merged and there's a new release done.
+  @Test(enabled = false)
   public void versionShouldStartWithDigit() throws Exception {
     Class<?> versionClass = Class.forName("org.testng.internal.Version");
     Method getVersionStringMethod = versionClass.getMethod("getVersionString");