Replace isEqualTo(null) with isNull()

acl/src/test/java/org/springframework/security/acls/jdbc/EhCacheBasedAclCacheTests.java

@@ -154,11 +154,11 @@ public class EhCacheBasedAclCacheTests {
 
 		Object retrieved1 = FieldUtils.getProtectedFieldValue("aclAuthorizationStrategy",
 				retrieved);
-		assertThat(retrieved1).isEqualTo(null);
+		assertThat(retrieved1).isNull();
 
 		Object retrieved2 = FieldUtils.getProtectedFieldValue(
 				"permissionGrantingStrategy", retrieved);
-		assertThat(retrieved2).isEqualTo(null);
+		assertThat(retrieved2).isNull();
 	}
 
 	@Test

cas/src/test/java/org/springframework/security/cas/authentication/CasAuthenticationProviderTests.java

@@ -353,7 +353,7 @@ public class CasAuthenticationProviderTests {
 		assertThat(cap.supports(TestingAuthenticationToken.class)).isFalse();
 
 		// Try it anyway
-		assertThat(cap.authenticate(token)).isEqualTo(null);
+		assertThat(cap.authenticate(token)).isNull();
 	}
 
 	@Test
@@ -370,7 +370,7 @@ public class CasAuthenticationProviderTests {
 		UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(
 				"some_normal_user", "password",
 				AuthorityUtils.createAuthorityList("ROLE_A"));
-		assertThat(cap.authenticate(token)).isEqualTo(null);
+		assertThat(cap.authenticate(token)).isNull();
 	}
 
 	@Test

config/src/test/java/org/springframework/security/config/FilterChainProxyConfigTests.java

@@ -108,7 +108,7 @@ public class FilterChainProxyConfigTests {
 	public void pathWithNoMatchHasNoFilters() throws Exception {
 		FilterChainProxy filterChainProxy = appCtx.getBean(
 				"newFilterChainProxyNoDefaultPath", FilterChainProxy.class);
-		assertThat(filterChainProxy.getFilters("/nomatch")).isEqualTo(null);
+		assertThat(filterChainProxy.getFilters("/nomatch")).isNull();
 	}
 
 	// SEC-1235

core/src/test/java/org/springframework/security/access/intercept/RunAsManagerImplTests.java

@@ -52,7 +52,7 @@ public class RunAsManagerImplTests {
 
 		Authentication resultingToken = runAs.buildRunAs(inputToken, new Object(),
 				SecurityConfig.createList("SOMETHING_WE_IGNORE"));
-		assertThat(resultingToken).isEqualTo(null);
+		assertThat(resultingToken).isNull();
 	}
 
 	@Test

core/src/test/java/org/springframework/security/authentication/jaas/SecurityContextLoginModuleTests.java

@@ -103,7 +103,7 @@ public class SecurityContextLoginModuleTests {
 		this.module.login();
 		assertThat(this.module.logout()).as("Should return true as it succeeds").isTrue();
 		assertThat(this.module.getAuthentication()).as("Authentication should be null")
-				.isEqualTo(null);
+				.isNull();
 
 		assertThat(this.subject.getPrincipals().contains(this.auth))
 				.withFailMessage(

oauth2/oauth2-core/src/test/java/org/springframework/security/oauth2/core/ClaimAccessorTests.java

@@ -99,6 +99,6 @@ public class ClaimAccessorTests {
 		String claimName = "claim-with-null-value";
 		this.claims.put(claimName, null);
 
-		assertThat(this.claimAccessor.getClaimAsString(claimName)).isEqualTo(null);
+		assertThat(this.claimAccessor.getClaimAsString(claimName)).isNull();
 	}
 }

openid/src/test/java/org/springframework/security/openid/OpenIDAuthenticationProviderTests.java

@@ -216,7 +216,7 @@ public class OpenIDAuthenticationProviderTests {
 
 		UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(
 				USERNAME, "password");
-		assertThat(provider.authenticate(token)).isEqualTo(null);
+		assertThat(provider.authenticate(token)).isNull();
 	}
 
 	/*

taglibs/src/test/java/org/springframework/security/taglibs/authz/AuthenticationTagTests.java

@@ -101,7 +101,7 @@ public class AuthenticationTagTests {
 		authenticationTag.setProperty("principal");
 		assertThat(authenticationTag.doStartTag()).isEqualTo(Tag.SKIP_BODY);
 		assertThat(authenticationTag.doEndTag()).isEqualTo(Tag.EVAL_PAGE);
-		assertThat(authenticationTag.getLastMessage()).isEqualTo(null);
+		assertThat(authenticationTag.getLastMessage()).isNull();
 	}
 
 	@Test

web/src/test/java/org/springframework/security/web/authentication/SimpleUrlAuthenticationSuccessHandlerTests.java

@@ -108,7 +108,7 @@ public class SimpleUrlAuthenticationSuccessHandlerTests {
 		SimpleUrlAuthenticationSuccessHandler ash = new SimpleUrlAuthenticationSuccessHandler();
 		ash.setTargetUrlParameter("targetUrl");
 		ash.setTargetUrlParameter(null);
-		assertThat(ash.getTargetUrlParameter()).isEqualTo(null);
+		assertThat(ash.getTargetUrlParameter()).isNull();
 	}
 
 	@Test

web/src/test/java/org/springframework/security/web/authentication/preauth/AbstractPreAuthenticatedProcessingFilterTests.java

@@ -147,7 +147,7 @@ public class AbstractPreAuthenticatedProcessingFilterTests {
 		filter.doFilter(new MockHttpServletRequest(), new MockHttpServletResponse(),
 				new MockFilterChain());
 
-		assertThat(SecurityContextHolder.getContext().getAuthentication()).isEqualTo(null);
+		assertThat(SecurityContextHolder.getContext().getAuthentication()).isNull();
 	}
 
 	@Test