添加测试

tests/gtest/undo_stack_test.cpp

@@ -0,0 +1,44 @@
+#include <gtest/gtest.h>
+
+#include "undo/undostack.h"
+#include "undo/undocommand.h"
+
+namespace {
+class TestCommand final : public olive::UndoCommand {
+public:
+	explicit TestCommand(int *value)
+		: value_(value)
+	{
+	}
+
+protected:
+	void redo() override
+	{
+		if (value_) {
+			(*value_)++;
+		}
+	}
+
+	void undo() override
+	{
+		if (value_) {
+			(*value_)--;
+		}
+	}
+
+private:
+	int *value_ = nullptr;
+};
+}
+
+TEST(UndoStack, PushUndoRedo)
+{
+	int counter = 0;
+	olive::UndoStack stack;
+	stack.push(new TestCommand(&counter), QStringLiteral("Test"));
+	EXPECT_EQ(counter, 1);
+	stack.undo();
+	EXPECT_EQ(counter, 0);
+	stack.redo();
+	EXPECT_EQ(counter, 1);
+}