Replace JUnit4 Assertions with Junit5 Jupiter Assertions

updated test methods to junit-5

kubernetes-client/src/test/java/io/fabric8/kubernetes/client/dsl/base/BaseOperationTest.java

@@ -33,7 +33,6 @@
 import io.fabric8.kubernetes.client.utils.Serialization;
 import io.fabric8.kubernetes.client.utils.URLUtils;
 import io.fabric8.kubernetes.client.utils.Utils;
-import okhttp3.OkHttpClient;
 import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
@@ -56,10 +55,10 @@
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.CoreMatchers.notNullValue;
 import static org.hamcrest.MatcherAssert.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
@@ -275,8 +274,7 @@ void testNoHttpRetryWithDefaultConfig() throws MalformedURLException, IOExceptio
     });
 
     // Then
-    assertTrue("As the first failure is an IOException the message of the causedBy expected to contain the given text: 'For example java.net.ConnectException'!",
-      exception.getCause().getMessage().contains("For example java.net.ConnectException"));
+    assertTrue(exception.getCause().getMessage().contains("For example java.net.ConnectException"), "As the first failure is an IOException the message of the causedBy expected to contain the given text: 'For example java.net.ConnectException'!");
     assertEquals(1, httpExecutionCounter.get());
   }
 
@@ -297,9 +295,8 @@ void testHttpRetryWithMoreFailuresThanRetries() throws MalformedURLException, IO
     });
 
     // Then
-    assertTrue("As the last failure, the 3rd one, is not an IOException the message expected to contain: 'Internal Server Error'!",
-        exception.getMessage().contains("Internal Server Error"));
-    assertEquals("Expected 4 calls: one normal try and 3 backoff retries!", 4, httpExecutionCounter.get());
+    assertTrue(exception.getMessage().contains("Internal Server Error"), "As the last failure, the 3rd one, is not an IOException the message expected to contain: 'Internal Server Error'!");
+    assertEquals(4, httpExecutionCounter.get(),  "Expected 4 calls: one normal try and 3 backoff retries!");
   }
 
   @Test
@@ -318,7 +315,7 @@ void testHttpRetryWithLessFailuresThanRetries() throws MalformedURLException, IO
 
     // Then
     assertNotNull(result);
-    assertEquals("Expected 3 calls: 2 failures and 1 success!", 3, httpExecutionCounter.get());
+    assertEquals(3, httpExecutionCounter.get(), "Expected 3 calls: 2 failures and 1 success!");
   }
 
   @Test

kubernetes-client/src/test/java/io/fabric8/kubernetes/client/informers/cache/ReflectorTest.java

@@ -26,9 +26,9 @@
 import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
-import static org.junit.Assert.assertTrue;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 class ReflectorTest {