1 files changed, 38 insertions, 0 deletions
diff --git a/pw_allocator/null_allocator_test.cc b/pw_allocator/null_allocator_test.cc
new file mode 100644
index 000000000..0b319646a
--- /dev/null
+++ b/pw_allocator/null_allocator_test.cc
@@ -0,0 +1,38 @@
+// Copyright 2023 The Pigweed 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
+//
+//     https://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 "pw_allocator/null_allocator.h"
+
+#include "gtest/gtest.h"
+
+namespace pw::allocator {
+
+TEST(NullAllocatorTest, Allocate) {
+  NullAllocator allocator;
+  // Allocate should fail, regardless of size and alignment.
+  for (size_t size = 1; size < 0x100; size <<= 1) {
+    for (size_t alignment = 1; alignment < 0x100; alignment <<= 1) {
+      EXPECT_EQ(allocator.Allocate(Layout(size, alignment)), nullptr);
+    }
+  }
+}
+
+TEST(NullAllocatorTest, Resize) {
+  NullAllocator allocator;
+  // It is not possible to get a valid pointer from Allocate.
+  constexpr Layout layout = Layout::Of<uint8_t>();
+  EXPECT_FALSE(allocator.Resize(this, layout, 1));
+}
+
+}  // namespace pw::allocator