Use the partition allocator and run the test in debug too.

Source/wtf/PartitionAllocTest.cpp

Index: Source/wtf/PartitionAllocTest.cpp
diff --git a/Source/wtf/PartitionAllocTest.cpp b/Source/wtf/PartitionAllocTest.cpp
index 4a4fbc86cb6823406c38b32c3db5a2b34d5fe82f..8e44c9b930bf94107475b60c04dca50182830f4e 100644
--- a/Source/wtf/PartitionAllocTest.cpp
+++ b/Source/wtf/PartitionAllocTest.cpp
@@ -46,7 +46,7 @@
 #endif
 #endif // OS(UNIX)
 
-#if defined(NDEBUG) && !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
+#if !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
 
 namespace {
 
@@ -67,7 +67,9 @@ static void TestSetup()
 
 static void TestShutdown()
 {
-    partitionAllocShutdown(&root);
+    // We expect no leaks in the general case. We have a test for leak
+    // detection.
+    EXPECT_TRUE(partitionAllocShutdown(&root));
 }
 
 static WTF::PartitionPageHeader* GetFullPage(size_t size)
@@ -133,6 +135,14 @@ TEST(WTF_PartitionAlloc, Basic)
     TestShutdown();
 }
 
+// Check that we can detect a memory leak.
+TEST(WTF_PartitionAlloc, SimpleLeak)
+{
+    TestSetup();
+    void* leakedPtr = partitionAlloc(&root, kTestAllocSize);
+    EXPECT_FALSE(partitionAllocShutdown(&root));
+}
+
 // Test multiple allocations, and freelist handling.
 TEST(WTF_PartitionAlloc, MultiAlloc)
 {
@@ -382,4 +392,4 @@ TEST(WTF_PartitionAlloc, MappingCollision)
 
 } // namespace
 
-#endif // defined(NDEBUG) && !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
+#endif // !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)