Add unit tests for mimir::Region

CMakeLists.txt

@@ -41,3 +41,5 @@ install(
     PUBLIC_HEADER
       DESTINATION include/mimir
 )
+
+add_subdirectory(tests)

tests/CMakeLists.txt

@@ -0,0 +1,28 @@
+# ----====---- GoogleTest ----====---
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+# ----====---- End: GoogleTest ----====---
+
+enable_testing()
+
+add_executable(
+  mimir_test
+  "region_test.cpp"
+)
+target_link_libraries(
+  mimir_test
+  GTest::gtest_main
+  mimir
+)
+
+target_include_directories(mimir_test PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../include)
+
+include(GoogleTest)
+gtest_discover_tests(mimir_test)

tests/region_test.cpp

@@ -0,0 +1,55 @@
+#include <gtest/gtest.h>
+#include "mimir.h"
+
+void writeData(std::byte* dest, size_t count, int seed)
+{
+  for (int i = 0; i < count; i++) {
+    dest[i] = std::byte((seed * 3162 + i * 63163) % 0xff);
+  }
+}
+
+bool checkData(std::byte* src, size_t count, int seed)
+{
+  for (int i = 0; i < count; i++) {
+    if (src[i] != std::byte((seed * 3162 + i * 63163) % 0xff)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+TEST(Mimir_Region, Uninitialized) {
+  mimir::init();
+  mimir::Region region;
+  EXPECT_TRUE(region.getAddress() == nullptr);
+  EXPECT_TRUE(region.getMaxSize() == 0);
+  EXPECT_TRUE(region.getSize() == 0);
+}
+
+TEST(Mimir_Region, Resizing)
+{
+  mimir::init();
+  mimir::Region region;
+
+  EXPECT_TRUE(region.init(1 << 10ULL));
+  EXPECT_NE(region.getAddress(), nullptr);
+  EXPECT_GT(region.getMaxSize(), 0);
+  EXPECT_EQ(region.getSize(), 0);
+  EXPECT_TRUE(region.resize(0));
+  EXPECT_EQ(region.getSize(), 0);
+  EXPECT_FALSE(region.resize(1 << 20ULL));
+  EXPECT_EQ(region.getSize(), 0);
+  EXPECT_TRUE(region.resize(100));
+  EXPECT_GE(region.getSize(), 100);
+  writeData(region.getAddress(), 100, 1);
+  EXPECT_TRUE(checkData(region.getAddress(), 100, 1));
+  EXPECT_TRUE(region.resize(1 << 9ULL));
+  writeData(region.getAddress() + 100, 900, 2);
+  EXPECT_TRUE(checkData(region.getAddress(), 100, 1));
+  EXPECT_TRUE(checkData(region.getAddress() + 100, 900, 2));
+
+  EXPECT_TRUE(region.resize(1 << 10ULL));
+  EXPECT_TRUE(region.resize(1 << 5ULL));
+  EXPECT_TRUE(region.resize(1 << 0ULL));
+  EXPECT_TRUE(region.resize(1 << 9ULL));
+}