Additional test for hidl registering.

Make sure other registered interfaces are left untouched
even if they are the same instance.

Test: hidl_test
Change-Id: I2f7a3f1836d270addc7b46ff92c3aeb547e11828
diff --git a/test/hidl_test/hidl_test_client.cpp b/test/hidl_test/hidl_test_client.cpp
index aa3cded..5070733 100644
--- a/test/hidl_test/hidl_test_client.cpp
+++ b/test/hidl_test/hidl_test_client.cpp
@@ -612,10 +612,13 @@
     using ::android::hardware::interfacesEqual;
 
     const std::string kInstanceName = "no-matter-what-it-is";
+    const std::string kOtherName = "something-different";
+
     sp<IChild> child = new SimpleChild();
     sp<IParent> parent = new SimpleParent();
 
     EXPECT_EQ(::android::OK, child->registerAsService(kInstanceName));
+    EXPECT_EQ(::android::OK, child->registerAsService(kOtherName));
 
     EXPECT_TRUE(interfacesEqual(child, IChild::getService(kInstanceName)));
     EXPECT_TRUE(interfacesEqual(child, IParent::getService(kInstanceName)));
@@ -626,6 +629,10 @@
     // since binderized instance is nullptr
     EXPECT_FALSE(interfacesEqual(parent, IChild::getService(kInstanceName)));
     EXPECT_TRUE(interfacesEqual(parent, IParent::getService(kInstanceName)));
+
+    // other instance name is unchanged
+    EXPECT_TRUE(interfacesEqual(child, IChild::getService(kOtherName)));
+    EXPECT_TRUE(interfacesEqual(child, IParent::getService(kOtherName)));
 }
 
 // passthrough TODO(b/31959402)