Add tests for ObjectBase's refcounting

src/tests/CMakeLists.txt

@@ -19,6 +19,7 @@ add_executable(nxt_unittests
     ${UNITTESTS_DIR}/CommandAllocatorTests.cpp
     ${UNITTESTS_DIR}/EnumClassBitmasksTests.cpp
     ${UNITTESTS_DIR}/MathTests.cpp
+    ${UNITTESTS_DIR}/ObjectBaseTests.cpp
     ${UNITTESTS_DIR}/PerStageTests.cpp
     ${UNITTESTS_DIR}/RefCountedTests.cpp
     ${UNITTESTS_DIR}/ToBackendTests.cpp

src/tests/unittests/ObjectBaseTests.cpp

@@ -0,0 +1,123 @@
+// Copyright 2017 The NXT Authors
+//
+// Licensed 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.
+
+#include <gtest/gtest.h>
+
+#include "nxt/nxtcpp.h"
+
+class Object : public nxt::ObjectBase<Object, int*> {
+    public:
+        using ObjectBase::ObjectBase;
+        using ObjectBase::operator=;
+
+        static void NxtReference(int* handle) {
+            ASSERT_LT(0, *handle);
+            *handle += 1;
+        }
+        static void NxtRelease(int* handle) {
+            ASSERT_LT(0, *handle);
+            *handle -= 1;
+        }
+};
+
+// Test that creating an C++ object from a C object takes a ref.
+// Also test that the C++ object destructor removes a ref.
+TEST(ObjectBase, CTypeConstructor) {
+    int refcount = 1;
+    {
+        Object obj(&refcount);
+        ASSERT_EQ(2, refcount);
+    }
+    ASSERT_EQ(1, refcount);
+}
+
+// Test consuming a C object into a C++ object doesn't take a ref.
+TEST(ObjectBase, AcquireConstruction) {
+    int refcount = 1;
+    {
+        Object object = Object::Acquire(&refcount);
+        ASSERT_EQ(1, refcount);
+    }
+    ASSERT_EQ(0, refcount);
+}
+
+// Test that cloning takes a new ref. Also test .Get().
+TEST(ObjectBase, Clone) {
+    int refcount = 1;
+    {
+        Object obj1(&refcount);
+        Object obj2 = obj1.Clone();
+
+        ASSERT_EQ(3, refcount);
+        ASSERT_EQ(&refcount, obj1.Get());
+        ASSERT_EQ(&refcount, obj2.Get());
+    }
+    ASSERT_EQ(1, refcount);
+}
+
+// Test that Release consumes the C++ object into a C object and doesn't release
+TEST(ObjectBase, Release) {
+    int refcount = 1;
+    {
+        Object obj(&refcount);
+        ASSERT_EQ(2, refcount);
+
+        ASSERT_EQ(&refcount, obj.Release());
+        ASSERT_EQ(nullptr, obj.Get());
+        ASSERT_EQ(2, refcount);
+    }
+    ASSERT_EQ(2, refcount);
+}
+
+// Test using C++ objects in conditions
+TEST(ObjectBase, OperatorBool) {
+    int refcount = 1;
+    Object trueObj(&refcount);
+    Object falseObj;
+
+    if (falseObj || !trueObj) {
+        ASSERT_TRUE(false);
+    }
+}
+
+// Test the move constructor of C++ objects
+TEST(ObjectBase, MoveConstructor) {
+    int refcount = 1;
+    Object source(&refcount);
+    Object destination(std::move(source));
+
+    ASSERT_EQ(source.Get(), nullptr);
+    ASSERT_EQ(destination.Get(), &refcount);
+    ASSERT_EQ(2, refcount);
+
+    destination = Object();
+    ASSERT_EQ(refcount, 1);
+}
+
+// Test the move assignment of C++ objects
+TEST(ObjectBase, MoveAssignment) {
+    int refcount = 1;
+    Object source(&refcount);
+
+    Object destination;
+    destination = std::move(source);
+
+    ASSERT_EQ(source.Get(), nullptr);
+    ASSERT_EQ(destination.Get(), &refcount);
+    ASSERT_EQ(2, refcount);
+
+    destination = Object();
+    ASSERT_EQ(refcount, 1);
+}
+