diff --git a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2AuthorizationCodeReactiveAuthenticationManagerTests.java b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2AuthorizationCodeReactiveAuthenticationManagerTests.java
index f5112dbcb8..bd62f84d07 100644
--- a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2AuthorizationCodeReactiveAuthenticationManagerTests.java
+++ b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2AuthorizationCodeReactiveAuthenticationManagerTests.java
@@ -21,6 +21,8 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.junit.MockitoJUnitRunner;
+import reactor.core.publisher.Mono;
+
 import org.springframework.security.oauth2.client.endpoint.OAuth2AuthorizationCodeGrantRequest;
 import org.springframework.security.oauth2.client.endpoint.ReactiveOAuth2AccessTokenResponseClient;
 import org.springframework.security.oauth2.client.registration.ClientRegistration;
@@ -34,12 +36,11 @@ import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationResp
 import org.springframework.security.oauth2.core.endpoint.TestOAuth2AccessTokenResponses;
 import org.springframework.security.oauth2.core.endpoint.TestOAuth2AuthorizationRequests;
 import org.springframework.security.oauth2.core.endpoint.TestOAuth2AuthorizationResponses;
-import reactor.core.publisher.Mono;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.mockito.ArgumentMatchers.any;
-import static org.powermock.api.mockito.PowerMockito.when;
+import static org.mockito.Mockito.when;
 
 /**
  * @author Rob Winch
diff --git a/oauth2/oauth2-core/src/test/java/org/springframework/security/oauth2/core/endpoint/OAuth2AuthorizationExchangeTests.java b/oauth2/oauth2-core/src/test/java/org/springframework/security/oauth2/core/endpoint/OAuth2AuthorizationExchangeTests.java
index 99c59f50c6..35f02806a9 100644
--- a/oauth2/oauth2-core/src/test/java/org/springframework/security/oauth2/core/endpoint/OAuth2AuthorizationExchangeTests.java
+++ b/oauth2/oauth2-core/src/test/java/org/springframework/security/oauth2/core/endpoint/OAuth2AuthorizationExchangeTests.java
@@ -16,36 +16,32 @@
 package org.springframework.security.oauth2.core.endpoint;
 
 import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.powermock.core.classloader.annotations.PrepareForTest;
-import org.powermock.modules.junit4.PowerMockRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.Mockito.mock;
+import static org.springframework.security.oauth2.core.endpoint.TestOAuth2AuthorizationRequests.request;
+import static org.springframework.security.oauth2.core.endpoint.TestOAuth2AuthorizationResponses.success;
 
 /**
  * Tests for {@link OAuth2AuthorizationExchange}.
  *
  * @author Joe Grandja
  */
-@RunWith(PowerMockRunner.class)
-@PrepareForTest({OAuth2AuthorizationExchange.class, OAuth2AuthorizationRequest.class, OAuth2AuthorizationResponse.class})
 public class OAuth2AuthorizationExchangeTests {
 
 	@Test(expected = IllegalArgumentException.class)
 	public void constructorWhenAuthorizationRequestIsNullThenThrowIllegalArgumentException() {
-		new OAuth2AuthorizationExchange(null, mock(OAuth2AuthorizationResponse.class));
+		new OAuth2AuthorizationExchange(null, success().build());
 	}
 
 	@Test(expected = IllegalArgumentException.class)
 	public void constructorWhenAuthorizationResponseIsNullThenThrowIllegalArgumentException() {
-		new OAuth2AuthorizationExchange(mock(OAuth2AuthorizationRequest.class), null);
+		new OAuth2AuthorizationExchange(request().build(), null);
 	}
 
 	@Test
 	public void constructorWhenRequiredArgsProvidedThenCreated() {
-		OAuth2AuthorizationRequest authorizationRequest = mock(OAuth2AuthorizationRequest.class);
-		OAuth2AuthorizationResponse authorizationResponse = mock(OAuth2AuthorizationResponse.class);
+		OAuth2AuthorizationRequest authorizationRequest = request().build();
+		OAuth2AuthorizationResponse authorizationResponse = success().build();
 		OAuth2AuthorizationExchange authorizationExchange =
 			new OAuth2AuthorizationExchange(authorizationRequest, authorizationResponse);
 		assertThat(authorizationExchange.getAuthorizationRequest()).isEqualTo(authorizationRequest);
diff --git a/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/NimbusJwtDecoderJwkSupportTests.java b/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/NimbusJwtDecoderJwkSupportTests.java
index c0cd424ab0..580a3d4c0b 100644
--- a/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/NimbusJwtDecoderJwkSupportTests.java
+++ b/oauth2/oauth2-jose/src/test/java/org/springframework/security/oauth2/jwt/NimbusJwtDecoderJwkSupportTests.java
@@ -20,16 +20,10 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
-import com.nimbusds.jwt.JWTParser;
 import okhttp3.mockwebserver.MockResponse;
 import okhttp3.mockwebserver.MockWebServer;
 import org.assertj.core.api.Assertions;
 import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mockito;
-import org.powermock.core.classloader.annotations.PowerMockIgnore;
-import org.powermock.core.classloader.annotations.PrepareForTest;
-import org.powermock.modules.junit4.PowerMockRunner;
 
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.http.HttpStatus;
@@ -48,9 +42,9 @@ import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
-import static org.powermock.api.mockito.PowerMockito.spy;
-import static org.powermock.api.mockito.PowerMockito.when;
+import static org.mockito.Mockito.when;
 
 /**
  * Tests for {@link NimbusJwtDecoderJwkSupport}.
@@ -58,9 +52,6 @@ import static org.powermock.api.mockito.PowerMockito.when;
  * @author Joe Grandja
  * @author Josh Cummings
  */
-@RunWith(PowerMockRunner.class)
-@PrepareForTest({NimbusJwtDecoderJwkSupport.class, JWTParser.class})
-@PowerMockIgnore("okhttp3.*")
 public class NimbusJwtDecoderJwkSupportTests {
 	private static final String JWK_SET_URL = "https://provider.com/oauth2/keys";
 	private static final String JWS_ALGORITHM = JwsAlgorithms.RS256;
@@ -248,7 +239,7 @@ public class NimbusJwtDecoderJwkSupportTests {
 
 	private static RestOperations mockJwkSetResponse(String response) {
 		RestOperations restOperations = mock(RestOperations.class);
-		Mockito.when(restOperations.exchange(any(RequestEntity.class), eq(String.class)))
+		when(restOperations.exchange(any(RequestEntity.class), eq(String.class)))
 				.thenReturn(new ResponseEntity<>(response, HttpStatus.OK));
 		return restOperations;
 	}