chore: use JUnit4 in tests

this is basically not rely on extending TestCase
and using @test annotations

Author: diegomarquezp

google-http-client/src/test/java/com/google/api/client/http/AbstractHttpContentTest.java

@@ -14,17 +14,21 @@
 
 package com.google.api.client.http;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Arrays;
 import junit.framework.TestCase;
+import org.junit.Test;
 
 /**
  * Tests {@link AbstractHttpContent}.
  *
  * @author Yaniv Inbar
  */
-public class AbstractHttpContentTest extends TestCase {
+public class AbstractHttpContentTest {
 
   static class TestHttpContent extends AbstractHttpContent {
 
@@ -54,11 +58,13 @@ public boolean retrySupported() {
     }
   }
 
+  @Test
   public void testRetrySupported() {
     AbstractHttpContent content = new TestHttpContent(true, 0);
     assertTrue(content.retrySupported());
   }
 
+  @Test
   public void testComputeLength() throws Exception {
     subtestComputeLength(true, 0, 0);
     subtestComputeLength(true, 1, 1);

google-http-client/src/test/java/com/google/api/client/http/BasicAuthenticationTest.java

@@ -14,29 +14,34 @@
 
 package com.google.api.client.http;
 
+import static org.junit.Assert.assertEquals;
+
 import com.google.api.client.testing.http.HttpTesting;
 import com.google.api.client.testing.http.MockHttpTransport;
 import junit.framework.TestCase;
+import org.junit.Test;
 
 /**
  * Tests {@link BasicAuthentication}.
  *
  * @author Yaniv Inbar
  */
-public class BasicAuthenticationTest extends TestCase {
+public class BasicAuthenticationTest {
 
   static final String USERNAME = "Aladdin";
 
   static final String PASSWORD = "open sesame";
 
   static final String AUTH_HEADER = "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==";
 
+  @Test
   public void testConstructor() {
     BasicAuthentication auth = new BasicAuthentication(USERNAME, PASSWORD);
     assertEquals(USERNAME, auth.getUsername());
     assertEquals(PASSWORD, auth.getPassword());
   }
 
+  @Test
   public void testInitialize() throws Exception {
     BasicAuthentication auth = new BasicAuthentication(USERNAME, PASSWORD);
     HttpRequest request =

google-http-client/src/test/java/com/google/api/client/http/ByteArrayContentTest.java

@@ -14,20 +14,26 @@
 
 package com.google.api.client.http;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 import com.google.api.client.util.IOUtils;
 import com.google.api.client.util.StringUtils;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import junit.framework.TestCase;
+import org.junit.Test;
 
 /**
  * Tests {@link ByteArrayContent}.
  *
  * @author Yaniv Inbar
  */
-public class ByteArrayContentTest extends TestCase {
+public class ByteArrayContentTest {
   private static final byte[] FOO = StringUtils.getBytesUtf8("foo");
 
+  @Test
   public void testConstructor() throws IOException {
     subtestConstructor(new ByteArrayContent("type", FOO), "foo");
     subtestConstructor(new ByteArrayContent("type", FOO, 0, 3), "foo");

google-http-client/src/test/java/com/google/api/client/http/EmptyContentTest.java

@@ -14,17 +14,23 @@
 
 package com.google.api.client.http;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import junit.framework.TestCase;
+import org.junit.Test;
 
 /**
  * Tests {@link EmptyContent}.
  *
  * @author Yaniv Inbar
  */
-public class EmptyContentTest extends TestCase {
+public class EmptyContentTest {
 
+  @Test
   public void test() throws IOException {
     EmptyContent content = new EmptyContent();
     assertEquals(0L, content.getLength());

google-http-client/src/test/java/com/google/api/client/http/ExponentialBackOffPolicyTest.java

@@ -14,21 +14,22 @@
 
 package com.google.api.client.http;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 import com.google.api.client.util.NanoClock;
 import junit.framework.TestCase;
+import org.junit.Test;
 
 /**
  * Tests {@link ExponentialBackOffPolicy}.
  *
  * @author Ravi Mistry
  */
 @Deprecated
-public class ExponentialBackOffPolicyTest extends TestCase {
-
-  public ExponentialBackOffPolicyTest(String name) {
-    super(name);
-  }
+public class ExponentialBackOffPolicyTest {
 
+  @Test
   public void testConstructor() {
     ExponentialBackOffPolicy backOffPolicy = new ExponentialBackOffPolicy();
     assertEquals(
@@ -39,15 +40,16 @@ public void testConstructor() {
         backOffPolicy.getCurrentIntervalMillis());
     assertEquals(
         ExponentialBackOffPolicy.DEFAULT_RANDOMIZATION_FACTOR,
-        backOffPolicy.getRandomizationFactor());
-    assertEquals(ExponentialBackOffPolicy.DEFAULT_MULTIPLIER, backOffPolicy.getMultiplier());
+        backOffPolicy.getRandomizationFactor(), 0);
+    assertEquals(ExponentialBackOffPolicy.DEFAULT_MULTIPLIER, backOffPolicy.getMultiplier(), 0);
     assertEquals(
         ExponentialBackOffPolicy.DEFAULT_MAX_INTERVAL_MILLIS, backOffPolicy.getMaxIntervalMillis());
     assertEquals(
         ExponentialBackOffPolicy.DEFAULT_MAX_ELAPSED_TIME_MILLIS,
         backOffPolicy.getMaxElapsedTimeMillis());
   }
 
+  @Test
   public void testBuilder() {
     ExponentialBackOffPolicy backOffPolicy = ExponentialBackOffPolicy.builder().build();
     assertEquals(
@@ -58,8 +60,8 @@ public void testBuilder() {
         backOffPolicy.getCurrentIntervalMillis());
     assertEquals(
         ExponentialBackOffPolicy.DEFAULT_RANDOMIZATION_FACTOR,
-        backOffPolicy.getRandomizationFactor());
-    assertEquals(ExponentialBackOffPolicy.DEFAULT_MULTIPLIER, backOffPolicy.getMultiplier());
+        backOffPolicy.getRandomizationFactor(), 0);
+    assertEquals(ExponentialBackOffPolicy.DEFAULT_MULTIPLIER, backOffPolicy.getMultiplier(), 0);
     assertEquals(
         ExponentialBackOffPolicy.DEFAULT_MAX_INTERVAL_MILLIS, backOffPolicy.getMaxIntervalMillis());
     assertEquals(
@@ -82,12 +84,13 @@ public void testBuilder() {
             .build();
     assertEquals(testInitialInterval, backOffPolicy.getInitialIntervalMillis());
     assertEquals(testInitialInterval, backOffPolicy.getCurrentIntervalMillis());
-    assertEquals(testRandomizationFactor, backOffPolicy.getRandomizationFactor());
-    assertEquals(testMultiplier, backOffPolicy.getMultiplier());
+    assertEquals(testRandomizationFactor, backOffPolicy.getRandomizationFactor(), 0);
+    assertEquals(testMultiplier, backOffPolicy.getMultiplier(), 0);
     assertEquals(testMaxInterval, backOffPolicy.getMaxIntervalMillis());
     assertEquals(testMaxElapsedTime, backOffPolicy.getMaxElapsedTimeMillis());
   }
 
+  @Test
   public void testBackOff() throws Exception {
     int testInitialInterval = 500;
     double testRandomizationFactor = 0.1;
@@ -130,13 +133,15 @@ public long nanoTime() {
     }
   }
 
+  @Test
   public void testGetElapsedTimeMillis() {
     ExponentialBackOffPolicy backOffPolicy =
         new ExponentialBackOffPolicy.Builder().setNanoClock(new MyNanoClock()).build();
     long elapsedTimeMillis = backOffPolicy.getElapsedTimeMillis();
     assertEquals("elapsedTimeMillis=" + elapsedTimeMillis, 1000, elapsedTimeMillis);
   }
 
+  @Test
   public void testBackOffOverflow() throws Exception {
     int testInitialInterval = Integer.MAX_VALUE / 2;
     double testMultiplier = 2.1;

google-http-client/src/test/java/com/google/api/client/http/GZipEncodingTest.java

@@ -14,19 +14,22 @@
 
 package com.google.api.client.http;
 
+import static org.junit.Assert.assertFalse;
+
 import com.google.api.client.testing.util.TestableByteArrayOutputStream;
 import com.google.api.client.util.ByteArrayStreamingContent;
 import com.google.api.client.util.StringUtils;
 import java.io.IOException;
 import junit.framework.TestCase;
 import org.junit.Assert;
+import org.junit.Test;
 
 /**
  * Tests {@link GZipEncoding}.
  *
  * @author Yaniv Inbar
  */
-public class GZipEncodingTest extends TestCase {
+public class GZipEncodingTest {
 
   private static final byte[] EXPECED_ZIPPED =
       new byte[] {
@@ -42,6 +45,7 @@ public class GZipEncodingTest extends TestCase {
         0, 0, 0, 0, 0, 0, 0, 0
       };
 
+  @Test
   public void test() throws IOException {
     // TODO: remove when no longer using Java < 16.
     byte[] expected =