diff --git a/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/authentication/CodeVerifierAuthenticator.java b/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/authentication/CodeVerifierAuthenticator.java
index c20d0a0a2..df3ff81a9 100644
--- a/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/authentication/CodeVerifierAuthenticator.java
+++ b/oauth2-authorization-server/src/main/java/org/springframework/security/oauth2/server/authorization/authentication/CodeVerifierAuthenticator.java
@@ -137,15 +137,13 @@ private boolean authenticate(OAuth2ClientAuthenticationToken clientAuthenticatio
 	}
 
 	private static boolean authorizationCodeGrant(Map<String, Object> parameters) {
-
-		if (!AuthorizationGrantType.AUTHORIZATION_CODE.getValue().equals(parameters.get(OAuth2ParameterNames.GRANT_TYPE))) {
+		if (!AuthorizationGrantType.AUTHORIZATION_CODE.getValue()
+			.equals(parameters.get(OAuth2ParameterNames.GRANT_TYPE))) {
 			return false;
 		}
-
 		if (!StringUtils.hasText((String) parameters.get(OAuth2ParameterNames.CODE))) {
 			throwInvalidGrant(OAuth2ParameterNames.CODE);
 		}
-
 		return true;
 	}
 
diff --git a/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/authentication/ClientSecretAuthenticationProviderTests.java b/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/authentication/ClientSecretAuthenticationProviderTests.java
index a91eeb4c7..4d41cf99f 100644
--- a/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/authentication/ClientSecretAuthenticationProviderTests.java
+++ b/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/authentication/ClientSecretAuthenticationProviderTests.java
@@ -46,7 +46,6 @@
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
-import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
 /**
diff --git a/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/config/annotation/web/configurers/OAuth2AuthorizationCodeGrantTests.java b/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/config/annotation/web/configurers/OAuth2AuthorizationCodeGrantTests.java
index ca5573e98..fd0a59108 100644
--- a/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/config/annotation/web/configurers/OAuth2AuthorizationCodeGrantTests.java
+++ b/oauth2-authorization-server/src/test/java/org/springframework/security/oauth2/server/authorization/config/annotation/web/configurers/OAuth2AuthorizationCodeGrantTests.java
@@ -25,7 +25,6 @@
 import java.time.temporal.ChronoUnit;
 import java.util.Arrays;
 import java.util.Base64;
-import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -72,7 +71,6 @@
 import org.springframework.security.crypto.password.NoOpPasswordEncoder;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.security.oauth2.core.AuthorizationGrantType;
-import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
 import org.springframework.security.oauth2.core.OAuth2RefreshToken;
 import org.springframework.security.oauth2.core.OAuth2Token;
 import org.springframework.security.oauth2.core.endpoint.OAuth2AccessTokenResponse;
@@ -100,7 +98,6 @@
 import org.springframework.security.oauth2.server.authorization.authentication.OAuth2AuthorizationConsentAuthenticationContext;
 import org.springframework.security.oauth2.server.authorization.authentication.OAuth2AuthorizationConsentAuthenticationProvider;
 import org.springframework.security.oauth2.server.authorization.authentication.OAuth2AuthorizationConsentAuthenticationToken;
-import org.springframework.security.oauth2.server.authorization.authentication.OAuth2ClientAuthenticationToken;
 import org.springframework.security.oauth2.server.authorization.client.JdbcRegisteredClientRepository;
 import org.springframework.security.oauth2.server.authorization.client.JdbcRegisteredClientRepository.RegisteredClientParametersMapper;
 import org.springframework.security.oauth2.server.authorization.client.RegisteredClient;
@@ -518,6 +515,7 @@ public void requestWhenPublicClientWithPkceAndCustomRefreshTokenGeneratorThenRet
 			.isEqualTo(true);
 	}
 
+	// gh-1680
 	@Test
 	public void requestWhenPublicClientWithPkceAndEmptyCodeThenBadRequest() throws Exception {
 		this.spring.register(AuthorizationServerConfiguration.class).autowire();
@@ -526,18 +524,17 @@ public void requestWhenPublicClientWithPkceAndEmptyCodeThenBadRequest() throws E
 		this.registeredClientRepository.save(registeredClient);
 
 		MultiValueMap<String, String> tokenRequestParameters = new LinkedMultiValueMap<>();
-		tokenRequestParameters.set(OAuth2ParameterNames.GRANT_TYPE, AuthorizationGrantType.AUTHORIZATION_CODE.getValue());
+		tokenRequestParameters.set(OAuth2ParameterNames.GRANT_TYPE,
+				AuthorizationGrantType.AUTHORIZATION_CODE.getValue());
 		tokenRequestParameters.set(OAuth2ParameterNames.CODE, "");
-		tokenRequestParameters.set(OAuth2ParameterNames.REDIRECT_URI, registeredClient.getRedirectUris().iterator().next());
+		tokenRequestParameters.set(OAuth2ParameterNames.REDIRECT_URI,
+				registeredClient.getRedirectUris().iterator().next());
 
 		this.mvc
-				.perform(post(DEFAULT_TOKEN_ENDPOINT_URI)
-						.params(tokenRequestParameters)
-						.param(OAuth2ParameterNames.CLIENT_ID, registeredClient.getClientId())
-						.param(PkceParameterNames.CODE_VERIFIER, S256_CODE_VERIFIER))
-				.andExpect(header().string(HttpHeaders.CACHE_CONTROL, containsString("no-store")))
-				.andExpect(header().string(HttpHeaders.PRAGMA, containsString("no-cache")))
-				.andExpect(status().isBadRequest());
+			.perform(post(DEFAULT_TOKEN_ENDPOINT_URI).params(tokenRequestParameters)
+				.param(OAuth2ParameterNames.CLIENT_ID, registeredClient.getClientId())
+				.param(PkceParameterNames.CODE_VERIFIER, S256_CODE_VERIFIER))
+			.andExpect(status().isBadRequest());
 	}
 
 	@Test