diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 61fc12c..ebe3387 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,6 +37,12 @@ jobs:
       - name: Build and verify with JaCoCo coverage gate
         run: mvn -B --no-transfer-progress clean verify
 
+      - name: Verify direct Surefire without agent initialization
+        run: mvn -B --no-transfer-progress surefire:test
+
+      - name: Verify tests with JaCoCo disabled
+        run: mvn -B --no-transfer-progress test -Djacoco.skip=true
+
       - name: Upload JaCoCo coverage report
         if: always()
         uses: actions/upload-artifact@v7
diff --git a/pom.xml b/pom.xml
index 46e950b..e05bafe 100644
--- a/pom.xml
+++ b/pom.xml
@@ -52,6 +52,8 @@
 
     <!-- 版本属性定义：Java 版本、依赖版本与 Maven 插件版本统一管理 -->
     <properties>
+        <!-- Safe when Surefire runs without JaCoCo prepare-agent. -->
+        <argLine></argLine>
         <java.version>17</java.version>
         <maven.compiler.release>${java.version}</maven.compiler.release>
         <maven.compiler.source>${java.version}</maven.compiler.source>
diff --git a/src/test/java/io/github/easy4j/opencode/OpenCodeHttpClientConfigTest.java b/src/test/java/io/github/easy4j/opencode/OpenCodeHttpClientConfigTest.java
index d8d0382..a489e14 100644
--- a/src/test/java/io/github/easy4j/opencode/OpenCodeHttpClientConfigTest.java
+++ b/src/test/java/io/github/easy4j/opencode/OpenCodeHttpClientConfigTest.java
@@ -86,4 +86,44 @@ void jsonBindsBothPropertyNamesAndRoundTrips() throws Exception {
             assertEquals(config, mapper.readValue(mapper.writeValueAsString(config), OpenCodeHttpClientConfig.class));
         }
     }
+
+    @Test
+    void jsonOutputExposesEqualCanonicalAndLegacyValues() throws Exception {
+        com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
+        OpenCodeHttpClientConfig config = new OpenCodeHttpClientConfig();
+        config.setBaseUrl("http://output:4096");
+        config.setStreamEventQueueCapacity(41);
+        com.fasterxml.jackson.databind.JsonNode json = mapper.valueToTree(config);
+        assertEquals("http://output:4096", json.get("baseUrl").asText());
+        assertEquals(json.get("baseUrl"), json.get("serverUrl"));
+        assertEquals(41, json.get("streamEventQueueCapacity").asInt());
+        assertEquals(json.get("streamEventQueueCapacity"), json.get("sseEventQueueCapacity"));
+    }
+
+    @Test
+    void conflictingJsonNamesUseLastValueInDocumentOrder() throws Exception {
+        com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
+        OpenCodeHttpClientConfig canonicalLast = mapper.readValue("""
+                {"serverUrl":"http://legacy:4096","baseUrl":"http://canonical:4096",
+                 "sseEventQueueCapacity":11,"streamEventQueueCapacity":22}
+                """, OpenCodeHttpClientConfig.class);
+        assertEquals("http://canonical:4096", canonicalLast.getServerUrl());
+        assertEquals(22, canonicalLast.getSseEventQueueCapacity());
+        OpenCodeHttpClientConfig legacyLast = mapper.readValue("""
+                {"baseUrl":"http://canonical:4096","serverUrl":"http://legacy:4096",
+                 "streamEventQueueCapacity":22,"sseEventQueueCapacity":11}
+                """, OpenCodeHttpClientConfig.class);
+        assertEquals("http://legacy:4096", legacyLast.getBaseUrl());
+        assertEquals(11, legacyLast.getStreamEventQueueCapacity());
+    }
+
+    @Test
+    void jsonAliasesAlsoBindNestedHttpConfiguration() throws Exception {
+        com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
+        OpenCodeClientConfig config = mapper.readValue("""
+                {"http":{"serverUrl":"http://nested:4096","sseEventQueueCapacity":19}}
+                """, OpenCodeClientConfig.class);
+        assertEquals("http://nested:4096", config.getHttp().getBaseUrl());
+        assertEquals(19, config.getHttp().getStreamEventQueueCapacity());
+    }
 }