chore: Revert Junit5 changes in samples directory

Author: lqiu96

samples/snippets/pom.xml

@@ -77,24 +77,6 @@
       <groupId>software.amazon.awssdk</groupId>
       <artifactId>regions</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.truth</groupId>
-      <artifactId>truth</artifactId>
-      <version>1.4.5</version>
-    </dependency>
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-api</artifactId>
-      <version>5.11.4</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-engine</artifactId>
-      <version>5.11.4</version>
-      <scope>test</scope>
-    </dependency>
   </dependencies>
 
 </project>
-

samples/snippets/src/test/java/SnippetsIT.java

@@ -27,27 +27,30 @@
 import java.security.GeneralSecurityException;
 import java.util.Arrays;
 import java.util.List;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.AfterAll;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.Test;
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
-class SnippetsIT {
+@RunWith(JUnit4.class)
+public class SnippetsIT {
 
   private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
   private static final String CREDENTIALS = System.getenv("GOOGLE_APPLICATION_CREDENTIALS");
   private ByteArrayOutputStream stdOut;
 
   // Check if the required environment variables are set.
-  static void requireEnvVar(String envVarName) {
+  public static void requireEnvVar(String envVarName) {
     assertWithMessage(String.format("Missing environment variable '%s' ", envVarName))
         .that(System.getenv(envVarName))
         .isNotEmpty();
   }
 
-  @BeforeAll
-  static void setup() throws IOException {
+  @BeforeClass
+  public static void setup() throws IOException {
     final PrintStream out = System.out;
     ByteArrayOutputStream stdOut = new ByteArrayOutputStream();
     System.setOut(new PrintStream(stdOut));
@@ -58,17 +61,17 @@ static void setup() throws IOException {
     System.setOut(out);
   }
 
-  @AfterAll
-  static void cleanup() {}
+  @AfterClass
+  public static void cleanup() {}
 
-  @BeforeEach
-  void beforeEach() {
+  @Before
+  public void beforeEach() {
     stdOut = new ByteArrayOutputStream();
     System.setOut(new PrintStream(stdOut));
   }
 
-  @AfterEach
-  void afterEach() {
+  @After
+  public void afterEach() {
     stdOut = null;
     System.setOut(null);
   }
@@ -91,33 +94,33 @@ private static String getIdTokenFromServiceAccount(
   }
 
   @Test
-  void testIdTokenFromServiceAccount() throws IOException {
+  public void testIdTokenFromServiceAccount() throws IOException {
     IdTokenFromServiceAccount.getIdTokenFromServiceAccount(CREDENTIALS, "https://example.com");
     assertThat(stdOut.toString()).contains("Generated ID token.");
   }
 
   @Test
-  void testVerifyGoogleIdToken() throws IOException {
+  public void testVerifyGoogleIdToken() throws IOException {
     String idToken = getIdTokenFromServiceAccount(CREDENTIALS, "https://example.com");
 
     VerifyGoogleIdToken.verifyGoogleIdToken(
         idToken, "https://example.com", "https://www.googleapis.com/oauth2/v3/certs");
   }
 
   @Test
-  void testIdTokenFromMetadataServer() throws GeneralSecurityException, IOException {
+  public void testIdTokenFromMetadataServer() throws GeneralSecurityException, IOException {
     IdTokenFromMetadataServer.getIdTokenFromMetadataServer("https://www.google.com");
     assertThat(stdOut.toString()).contains("Generated ID token.");
   }
 
   @Test
-  void testAuthenticateImplicitWithAdc() throws IOException {
+  public void testAuthenticateImplicitWithAdc() throws IOException {
     AuthenticateImplicitWithAdc.authenticateImplicitWithAdc(PROJECT_ID);
     assertThat(stdOut.toString()).contains("Listed all storage buckets.");
   }
 
   @Test
-  void testAuthenticateExplicit() throws IOException {
+  public void testAuthenticateExplicit() throws IOException {
     AuthenticateExplicit.authenticateExplicit(PROJECT_ID);
     assertThat(stdOut.toString()).contains("Listed all storage buckets.");
   }