Fix large allocation tests for mimir::Region

tests/CMakeLists.txt

@@ -8,10 +8,10 @@ FetchContent_Declare(
 set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 FetchContent_MakeAvailable(googletest)
 
-# ----====---- End: GoogleTest ----====---
-
 enable_testing()
 
+# ----====---- End: GoogleTest ----====---
+
 add_executable(
   mimir_test
   "region_test.cpp"

tests/region_test.cpp

@@ -1,6 +1,8 @@
 #include <gtest/gtest.h>
 #include "mimir.h"
 
+namespace mimir_tests {
+
 void writeData(std::byte* dest, size_t count, int seed)
 {
   for (int i = 0; i < count; i++) {
@@ -18,7 +20,8 @@ bool checkData(std::byte* src, size_t count, int seed)
   return true;
 }
 
-TEST(Mimir_Region, Uninitialized) {
+TEST(Region, InitialState)
+{
   mimir::init();
   mimir::Region region;
   EXPECT_TRUE(region.getAddress() == nullptr);
@@ -26,7 +29,29 @@ TEST(Mimir_Region, Uninitialized) {
   EXPECT_TRUE(region.getSize() == 0);
 }
 
-TEST(Mimir_Region, Resizing)
+TEST(Region, TooBig)
+{
+  mimir::init();
+  mimir::Region region;
+  EXPECT_FALSE(region.init(1ULL << 50)); // Attempt to reserve too many pages
+}
+
+TEST(Region, OutOfMemory)
+{
+  mimir::init();
+  mimir::Region region;
+  EXPECT_TRUE(region.init(1ULL << 46)); // Attempt to reserve 64TB of pages
+  EXPECT_FALSE(region.resize(1ULL << 45)); // Attempt to commit 32TB of pages (Assuming we don't have 32TB of ram!)
+}
+
+TEST(Region, Min1GB)
+{
+  mimir::init();
+  mimir::Region region;
+  EXPECT_TRUE(region.init(1ULL << 30)); // Allocate 1GB of pages
+}
+
+TEST(Region, Resizing)
 {
   mimir::init();
   mimir::Region region;
@@ -37,8 +62,32 @@ TEST(Mimir_Region, Resizing)
   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(1ULL << 4));
+  EXPECT_TRUE(region.resize(1ULL << 10));
+  EXPECT_TRUE(region.resize(1ULL << 5));
+  EXPECT_TRUE(region.resize(1ULL << 0));
+  EXPECT_TRUE(region.resize(1ULL << 9));
+}
+
+TEST(Region, OverSized)
+{
+  mimir::init();
+  mimir::Region region;
+
+  EXPECT_TRUE(region.resize(1ULL << 4));
+  size_t prevSize = region.getSize();
+
+  EXPECT_FALSE(region.resize(1ULL << 20));
+  EXPECT_EQ(region.getSize(), prevSize);
+}
+
+TEST(Region, WriteData)
+{
+  mimir::init();
+  mimir::Region region;
+
+  EXPECT_TRUE(region.init());
   EXPECT_TRUE(region.resize(100));
   EXPECT_GE(region.getSize(), 100);
   writeData(region.getAddress(), 100, 1);
@@ -47,9 +96,6 @@ TEST(Mimir_Region, Resizing)
   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));
 }
+
+}; // namespace mimir_tests