diff --git a/.github/workflows/proxy_lib.yml b/.github/workflows/proxy_lib.yml
index 678b40eff..581819c49 100644
--- a/.github/workflows/proxy_lib.yml
+++ b/.github/workflows/proxy_lib.yml
@@ -66,8 +66,8 @@ jobs:
 
       - name: Run "/usr/bin/ls" with proxy library
         working-directory: ${{env.BUILD_DIR}}
-        run: LD_PRELOAD=./lib/libumf_proxy.so /usr/bin/ls
+        run: UMF_PROXY="page.disposition=shared-fd" LD_PRELOAD=./lib/libumf_proxy.so /usr/bin/ls
 
       - name: Run "/usr/bin/date" with proxy library
         working-directory: ${{env.BUILD_DIR}}
-        run: LD_PRELOAD=./lib/libumf_proxy.so /usr/bin/date
+        run: UMF_PROXY="page.disposition=shared-shm" LD_PRELOAD=./lib/libumf_proxy.so /usr/bin/date
diff --git a/test/test_proxy_lib.cpp b/test/test_proxy_lib.cpp
index 557698117..85afc65be 100644
--- a/test/test_proxy_lib.cpp
+++ b/test/test_proxy_lib.cpp
@@ -15,15 +15,20 @@
 
 #include "base.hpp"
 #include "test_helpers.h"
+#include "utils_common.h"
 
 using umf_test::test;
 
-TEST_F(test, proxyLibBasic) {
+#define SIZE_64 64
+#define ALIGN_1024 1024
 
-    ::free(::malloc(64));
+TEST_F(test, proxyLib_basic) {
+
+    ::free(::malloc(SIZE_64));
 
     // a check to verify we are running the proxy library
     void *ptr = (void *)0x01;
+
 #ifdef _WIN32
     size_t size = _msize(ptr);
 #elif __APPLE__
@@ -31,5 +36,51 @@ TEST_F(test, proxyLibBasic) {
 #else
     size_t size = ::malloc_usable_size(ptr);
 #endif
+
     ASSERT_EQ(size, 0xDEADBEEF);
 }
+
+TEST_F(test, proxyLib_realloc_size0) {
+    // realloc(ptr, 0) == free (ptr)
+    // realloc(ptr, 0) returns NULL
+    ASSERT_EQ(::realloc(::malloc(SIZE_64), 0), nullptr);
+}
+
+TEST_F(test, proxyLib_malloc_usable_size) {
+
+    void *ptr = ::malloc(SIZE_64);
+    ASSERT_NE(ptr, nullptr);
+    if (ptr == nullptr) {
+        // Fix for the following CodeQL's warning on Windows:
+        // 'ptr' could be '0': this does not adhere to the specification for the function '_msize'.
+        return;
+    }
+
+#ifdef _WIN32
+    size_t size = _msize(ptr);
+#elif __APPLE__
+    size_t size = ::malloc_size(ptr);
+#else
+    size_t size = ::malloc_usable_size(ptr);
+#endif
+
+    ASSERT_EQ((int)(size == 0 || size >= SIZE_64), 1);
+
+    ::free(ptr);
+}
+
+TEST_F(test, proxyLib_aligned_alloc) {
+#ifdef _WIN32
+    void *ptr = _aligned_malloc(SIZE_64, ALIGN_1024);
+#else
+    void *ptr = ::aligned_alloc(ALIGN_1024, SIZE_64);
+#endif
+
+    ASSERT_EQ((int)(IS_ALIGNED((uintptr_t)ptr, ALIGN_1024)), 1);
+
+#ifdef _WIN32
+    _aligned_free(ptr);
+#else
+    ::free(ptr);
+#endif
+}