fix: refined sasl eval error msg format and relax test assertions

Author: SML0127

fluss-common/src/main/java/org/apache/fluss/security/auth/sasl/authenticator/SaslServerAuthenticator.java

@@ -144,7 +144,7 @@ public byte[] evaluateResponse(byte[] token) throws AuthenticationException {
                     (PrivilegedExceptionAction<byte[]>) () -> saslServer.evaluateResponse(token));
         } catch (Exception e) {
             throw new AuthenticationException(
-                    String.format("Failed to evaluate SASL response，reason is %s", e.getMessage()));
+                    String.format("Failed to evaluate SASL response: %s", e.getMessage()));
         }
     }
 

fluss-rpc/src/test/java/org/apache/fluss/rpc/netty/authenticate/SaslAuthenticationITCase.java

@@ -80,7 +80,7 @@ void testClientWrongPassword() {
         assertThatThrownBy(() -> testAuthentication(clientConfig))
                 .cause()
                 .isExactlyInstanceOf(AuthenticationException.class)
-                .hasMessage("Authentication failed: Invalid username or password");
+                .hasMessageContaining("Authentication failed: Invalid username or password");
     }
 
     @Test
@@ -140,7 +140,7 @@ void testServerMechanismWithListenerAndMechanism() throws Exception {
         assertThatThrownBy(() -> testAuthentication(clientConfig, serverConfig))
                 .cause()
                 .isExactlyInstanceOf(AuthenticationException.class)
-                .hasMessage("Authentication failed: Invalid username or password");
+                .hasMessageContaining("Authentication failed: Invalid username or password");
         clientConfig.setString(
                 "client.security.sasl.jaas.config",
                 "org.apache.fluss.security.auth.sasl.plain.PlainLoginModule required username=\"bob\" password=\"bob-secret\";");
@@ -175,7 +175,7 @@ void testSimplifyUsernameAndPassword() throws Exception {
         assertThatThrownBy(() -> testAuthentication(clientConfig))
                 .cause()
                 .isExactlyInstanceOf(AuthenticationException.class)
-                .hasMessage("Authentication failed: Invalid username or password");
+                .hasMessageContaining("Authentication failed: Invalid username or password");
         clientConfig.setString("client.security.sasl.password", "alice-secret");
         testAuthentication(clientConfig);
     }