http-client-java: add missing e2e coverage for newly generated scenarios in http-client-generator-test (#10675)

- [x] Identify which new scenarios from PR #10667 apply to
`http-client-generator-clientcore-test` (Azure-flavored packages are
excluded)
- [x] Add `payload/head/HeadTests.java` in clientcore-test
- [x] Add `specialwords/ReservedOperationBodyParamsClientTest.java` in
clientcore-test
- [x] Compile and run new tests with spector server — 2 tests, 0
failures
- [x] Run parallel validation — CodeQL clean; code review comments about
"add assertions" are not applicable per established test convention
(void-returning calls succeed or throw)

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: weidongxu-microsoft <53292327+weidongxu-microsoft@users.noreply.github.com>
Co-authored-by: Weidong Xu <weidxu@microsoft.com>

Author: Copilot

.chronus/changes/copilot-add-end2end-test-cases-2026-4-13-14-24-31.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-java"
+---
+
+Add e2e tests

.github/instructions/http-client-java.instructions.md

@@ -36,6 +36,7 @@ Typical task: `add e2e test case for <package>, scenario is <url-to-tsp-file>`.
 
 - The execution of `mvn` and `npm` command should be done in the test directory `<repository-root>/packages/http-client-java/generator/http-client-generator-test`.
 - Only commit Java files written by you. Do not commit any generated files.
+- If no scenario URL provided, search the related files in either https://github.com/microsoft/typespec/tree/main/packages/http-specs/specs or https://github.com/Azure/typespec-azure/tree/main/packages/azure-http-specs/specs
 
 0. Run `pwsh Setup.ps1` in `generator/http-client-generator-test` to set up the environment if not done before.
 1. The source files for the generated client under test are located in `generator/http-client-generator-test/src/main/java/<package>`.

packages/http-client-java/generator/http-client-generator-clientcore-test/src/test/java/payload/head/HeadTests.java

@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package payload.head;
+
+import io.clientcore.core.http.models.HttpHeaderName;
+import io.clientcore.core.http.models.RequestContext;
+import io.clientcore.core.http.models.Response;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class HeadTests {
+
+    private final HeadClient client = new HeadClientBuilder().buildClient();
+
+    @Test
+    public void testResponseHeaders() {
+        Response<Void> response = client.contentTypeHeaderInResponseWithResponse(RequestContext.none());
+        Assertions.assertEquals("text/plain; charset=utf-8",
+            response.getHeaders().getValue(HttpHeaderName.CONTENT_TYPE));
+        Assertions.assertEquals("hello", response.getHeaders().getValue(HttpHeaderName.fromString("x-ms-meta")));
+    }
+}

packages/http-client-java/generator/http-client-generator-clientcore-test/src/test/java/specialwords/ReservedOperationBodyParamsClientTest.java

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package specialwords;
+
+import java.util.Collections;
+import org.junit.jupiter.api.Test;
+
+public class ReservedOperationBodyParamsClientTest {
+
+    private final ReservedOperationBodyParamsClient client
+        = new SpecialWordsClientBuilder().buildReservedOperationBodyParamsClient();
+
+    @Test
+    public void testWithItems() {
+        client.withItems(Collections.singletonList("item"));
+    }
+}

packages/http-client-java/generator/http-client-generator-test/src/test/java/azure/clientgenerator/core/clientdoc/ClientDocTests.java

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package azure.clientgenerator.core.clientdoc;
+
+import azure.clientgenerator.core.clientdoc.documentation.models.Plant;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class ClientDocTests {
+
+    private final ClientDocClient client = new ClientDocClientBuilder().buildClient();
+
+    @Test
+    public void testHarvest() {
+        Plant response = client.harvest(new Plant("Rose", "Rosa"));
+        Assertions.assertEquals("Rose", response.getName());
+        Assertions.assertEquals("Rosa", response.getSpecies());
+    }
+}

packages/http-client-java/generator/http-client-generator-test/src/test/java/azure/clientgenerator/core/responseasbool/ResponseAsBoolTests.java

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package azure.clientgenerator.core.responseasbool;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class ResponseAsBoolTests {
+
+    private final ResponseAsBoolClient client = new ResponseAsBoolClientBuilder().buildClient();
+
+    @Test
+    public void testHeadAsBool() {
+        Assertions.assertTrue(client.exists());
+        Assertions.assertFalse(client.notExists());
+    }
+}

packages/http-client-java/generator/http-client-generator-test/src/test/java/azure/specialheaders/conditionalrequest/ConditionalRequestTests.java

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package azure.specialheaders.conditionalrequest;
+
+import org.junit.jupiter.api.Test;
+
+public class ConditionalRequestTests {
+
+    private final ConditionalRequestClient client = new ConditionalRequestClientBuilder().buildClient();
+
+    @Test
+    public void testConditionalRequestHeaders() {
+        client.postIfMatch("\"valid\"");
+        client.postIfNoneMatch("\"invalid\"");
+        client.postCustomIfMatch("\"valid\"");
+        client.postCustomIfNoneMatch("\"invalid\"");
+    }
+}

packages/http-client-java/generator/http-client-generator-test/src/test/java/payload/head/HeadTests.java

@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package payload.head;
+
+import com.azure.core.http.HttpHeaderName;
+import com.azure.core.http.rest.RequestOptions;
+import com.azure.core.http.rest.Response;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class HeadTests {
+
+    private final HeadClient client = new HeadClientBuilder().buildClient();
+
+    @Test
+    public void testResponseHeaders() {
+        Response<Void> response = client.contentTypeHeaderInResponseWithResponse(new RequestOptions());
+        Assertions.assertEquals("text/plain; charset=utf-8",
+            response.getHeaders().getValue(HttpHeaderName.CONTENT_TYPE));
+        Assertions.assertEquals("hello", response.getHeaders().getValue("x-ms-meta"));
+    }
+}

packages/http-client-java/generator/http-client-generator-test/src/test/java/specialwords/ReservedOperationBodyParamsClientTest.java

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package specialwords;
+
+import java.util.Collections;
+import org.junit.jupiter.api.Test;
+
+public class ReservedOperationBodyParamsClientTest {
+
+    private final ReservedOperationBodyParamsClient client
+        = new SpecialWordsClientBuilder().buildReservedOperationBodyParamsClient();
+
+    @Test
+    public void testWithItems() {
+        client.withItems(Collections.singletonList("item"));
+    }
+}