chore: migrate tests in oauth2_http module from JUnit4 to JUnit5 - fourth iteration (googleapis#756) (googleapis#766)

Author: Captain1653

oauth2_http/javatests/com/google/auth/oauth2/ITDownscopingTest.java

@@ -31,9 +31,9 @@
 
 package com.google.auth.oauth2;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.api.client.http.GenericUrl;
 import com.google.api.client.http.HttpRequest;
@@ -46,7 +46,7 @@
 import com.google.auth.Credentials;
 import com.google.auth.http.HttpCredentialsAdapter;
 import java.io.IOException;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 /**
  * Integration tests for Downscoping with Credential Access Boundaries via {@link
@@ -56,7 +56,7 @@
  * GOOGLE_APPLICATION_CREDENTIALS to point to the same service account configured in the setup
  * script (downscoping-with-cab-setup.sh).
  */
-public final class ITDownscopingTest {
+class ITDownscopingTest {
 
   // Output copied from the setup script (downscoping-with-cab-setup.sh).
   private static final String GCS_BUCKET_NAME = "cab-int-bucket-cbi3qrv5";
@@ -93,7 +93,7 @@ public final class ITDownscopingTest {
    * in the same bucket.
    */
   @Test
-  public void downscoping_serviceAccountSourceWithRefresh() throws IOException {
+  void downscoping_serviceAccountSourceWithRefresh() throws IOException {
     OAuth2CredentialsWithRefresh.OAuth2RefreshHandler refreshHandler =
         new OAuth2CredentialsWithRefresh.OAuth2RefreshHandler() {
           @Override
@@ -122,12 +122,12 @@ public AccessToken refreshAccessToken() throws IOException {
 
     // Attempt to retrieve the object that the downscoped token does not have access to. This should
     // fail.
-    try {
-      retrieveObjectFromGcs(credentials, GCS_OBJECT_NAME_WITHOUT_PERMISSION);
-      fail("Call to GCS should have failed.");
-    } catch (HttpResponseException e) {
-      assertEquals(403, e.getStatusCode());
-    }
+    HttpResponseException exception =
+        assertThrows(
+            HttpResponseException.class,
+            () -> retrieveObjectFromGcs(credentials, GCS_OBJECT_NAME_WITHOUT_PERMISSION),
+            "Call to GCS should have failed.");
+    assertEquals(403, exception.getStatusCode());
   }
 
   private void retrieveObjectFromGcs(Credentials credentials, String objectName)

oauth2_http/javatests/com/google/auth/oauth2/ITWorkloadIdentityFederationTest.java

@@ -31,8 +31,8 @@
 
 package com.google.auth.oauth2;
 
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.api.client.http.GenericUrl;
 import com.google.api.client.http.HttpRequest;
@@ -51,8 +51,8 @@
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 /**
  * Integration tests for Workload Identity Federation.
@@ -62,7 +62,7 @@
  * (workloadidentityfederation-setup). These tests call GCS to get bucket information. The bucket
  * name must be provided through the GCS_BUCKET environment variable.
  */
-public final class ITWorkloadIdentityFederationTest {
+class ITWorkloadIdentityFederationTest {
 
   // Copy output from workloadidentityfederation-setup.
   private static final String AUDIENCE_PREFIX =
@@ -75,8 +75,8 @@ public final class ITWorkloadIdentityFederationTest {
 
   private String clientEmail;
 
-  @Before
-  public void setup() throws IOException {
+  @BeforeEach
+  void setup() throws IOException {
     GenericJson keys = getServiceAccountKeyFileAsJson();
     clientEmail = (String) keys.get("client_email");
   }
@@ -89,7 +89,7 @@ public void setup() throws IOException {
    * service account key.
    */
   @Test
-  public void identityPoolCredentials() throws IOException {
+  void identityPoolCredentials() throws IOException {
     IdentityPoolCredentials identityPoolCredentials =
         (IdentityPoolCredentials)
             ExternalAccountCredentials.fromJson(
@@ -108,7 +108,7 @@ public void identityPoolCredentials() throws IOException {
    * service account key.
    */
   @Test
-  public void awsCredentials() throws Exception {
+  void awsCredentials() throws Exception {
     String idToken = generateGoogleIdToken(AWS_AUDIENCE);
 
     String url =
@@ -202,9 +202,7 @@ private GenericJson buildAwsCredentialConfig() {
 
   private void callGcs(GoogleCredentials credentials) throws IOException {
     String bucketName = System.getenv("GCS_BUCKET");
-    if (bucketName == null) {
-      fail("GCS bucket name not set through GCS_BUCKET env variable.");
-    }
+    assertNotNull(bucketName, "GCS bucket name not set through GCS_BUCKET env variable.");
 
     String url = "https://storage.googleapis.com/storage/v1/b/" + bucketName;
 

oauth2_http/javatests/com/google/auth/oauth2/JwtClaimsTest.java

@@ -31,19 +31,19 @@
 
 package com.google.auth.oauth2;
 
-import static org.junit.Assert.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.Collections;
 import java.util.Map;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
+import org.junit.jupiter.api.Test;
 
-@RunWith(JUnit4.class)
 public class JwtClaimsTest {
 
   @Test
-  public void testMergeOverwritesFields() {
+  void testMergeOverwritesFields() {
     JwtClaims claims1 =
         JwtClaims.newBuilder()
             .setAudience("audience-1")
@@ -64,7 +64,7 @@ public void testMergeOverwritesFields() {
   }
 
   @Test
-  public void testMergeDefaultValues() {
+  void testMergeDefaultValues() {
     JwtClaims claims1 =
         JwtClaims.newBuilder()
             .setAudience("audience-1")
@@ -80,7 +80,7 @@ public void testMergeDefaultValues() {
   }
 
   @Test
-  public void testMergeNull() {
+  void testMergeNull() {
     JwtClaims claims1 = JwtClaims.newBuilder().build();
     JwtClaims claims2 = JwtClaims.newBuilder().build();
     JwtClaims merged = claims1.merge(claims2);
@@ -93,7 +93,7 @@ public void testMergeNull() {
   }
 
   @Test
-  public void testEquals() {
+  void testEquals() {
     JwtClaims claims1 =
         JwtClaims.newBuilder()
             .setAudience("audience-1")
@@ -111,14 +111,14 @@ public void testEquals() {
   }
 
   @Test
-  public void testAdditionalClaimsDefaults() {
+  void testAdditionalClaimsDefaults() {
     JwtClaims claims = JwtClaims.newBuilder().build();
     assertNotNull(claims.getAdditionalClaims());
     assertTrue(claims.getAdditionalClaims().isEmpty());
   }
 
   @Test
-  public void testMergeAdditionalClaims() {
+  void testMergeAdditionalClaims() {
     JwtClaims claims1 =
         JwtClaims.newBuilder().setAdditionalClaims(Collections.singletonMap("foo", "bar")).build();
     JwtClaims claims2 =
@@ -138,7 +138,7 @@ public void testMergeAdditionalClaims() {
   }
 
   @Test
-  public void testIsComplete() {
+  void testIsComplete() {
     // Test JwtClaim is complete if audience is not set but scope is provided.
     JwtClaims claims =
         JwtClaims.newBuilder()