HttpClientProviderTest: Open CloseableHttpClient in try-with-resource

Change-Id: I28ec33b640ab82c690c539d5510079651704c73f
diff --git a/src/test/java/com/ericsson/gerrit/plugins/highavailability/forwarder/rest/HttpClientProviderTest.java b/src/test/java/com/ericsson/gerrit/plugins/highavailability/forwarder/rest/HttpClientProviderTest.java
index 395c110..8c01516 100644
--- a/src/test/java/com/ericsson/gerrit/plugins/highavailability/forwarder/rest/HttpClientProviderTest.java
+++ b/src/test/java/com/ericsson/gerrit/plugins/highavailability/forwarder/rest/HttpClientProviderTest.java
@@ -51,12 +51,14 @@
   @Test
   public void testGet() throws Exception {
     Injector injector = Guice.createInjector(new TestModule());
-    CloseableHttpClient httpClient1 =
-        injector.getInstance(CloseableHttpClient.class);
-    assertThat(httpClient1).isNotNull();
-    CloseableHttpClient httpClient2 =
-        injector.getInstance(CloseableHttpClient.class);
-    assertThat(httpClient1).isEqualTo(httpClient2);
+    try (CloseableHttpClient httpClient1 =
+        injector.getInstance(CloseableHttpClient.class)) {
+      assertThat(httpClient1).isNotNull();
+      try (CloseableHttpClient httpClient2 =
+          injector.getInstance(CloseableHttpClient.class)) {
+        assertThat(httpClient1).isEqualTo(httpClient2);
+      }
+    }
   }
 
   class TestModule extends LifecycleModule {