elkkhan commented on code in PR #12320:
URL: https://github.com/apache/kafka/pull/12320#discussion_r914831552


##########
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/RestClientTest.java:
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@@ -0,0 +1,234 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kafka.connect.runtime.rest;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.connect.runtime.rest.entities.ErrorMessage;
+import org.apache.kafka.connect.runtime.rest.errors.ConnectRestException;
+import org.eclipse.jetty.client.HttpClient;
+import org.eclipse.jetty.client.api.ContentResponse;
+import org.eclipse.jetty.client.api.Request;
+import org.jose4j.keys.HmacKey;
+import org.junit.Test;
+import org.junit.experimental.runners.Enclosed;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import javax.ws.rs.core.Response;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Objects;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeoutException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+@RunWith(Enclosed.class)
+public class RestClientTest {
+
+    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+    private static final TypeReference<TestDTO> TEST_TYPE = new 
TypeReference<TestDTO>() {
+    };
+
+    private static void assertIsInternalServerError(ConnectRestException e) {
+        assertEquals(Response.Status.INTERNAL_SERVER_ERROR.getStatusCode(), 
e.statusCode());
+        assertEquals(Response.Status.INTERNAL_SERVER_ERROR.getStatusCode(), 
e.errorCode());
+    }
+
+    private static RestClient.HttpResponse<TestDTO> httpRequest(HttpClient 
httpClient, String requestSignatureAlgorithm) {
+        return RestClient.httpRequest(
+                httpClient,
+                "https://localhost:1234/api/endpoint";,
+                "GET",
+                null,
+                new TestDTO("requestBodyData"),
+                TEST_TYPE,
+                new HmacKey("HMAC".getBytes(StandardCharsets.UTF_8)),
+                requestSignatureAlgorithm);
+    }
+
+    private static RestClient.HttpResponse<TestDTO> httpRequest(HttpClient 
httpClient) {
+        String validRequestSignatureAlgorithm = "HmacMD5";
+        return httpRequest(httpClient, validRequestSignatureAlgorithm);
+    }
+
+
+    @RunWith(Parameterized.class)
+    public static class RequestFailureParameterizedTest {
+        private static final HttpClient httpClient = mock(HttpClient.class);

Review Comment:
   `@Mock` can't be used since it needs a `MockitoJUnitRunner`, but we already 
have the `Parameterized` runner here and we can't have multiple runners on a 
class. Good point about the `static` mock, I missed that.
   
   `Any static field saves its state for the duration of the JVM's execution 
(unless code changes its value, of course). JUnit uses one JVM for all of its 
tests, so, yes, static fields save state between tests.`
   
   Changing the field to non-static
   
   



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