diff --git a/tests/string.c b/tests/string.c
index 6654bdf..06d3ac3 100644
--- a/tests/string.c
+++ b/tests/string.c
@@ -3,19 +3,51 @@
 #include <assert.h>
 #include <stddef.h>
 
+#define COUNT 1024
+
+static char aaa[COUNT], bbb[COUNT];
+
+#define memcmp  LIBCLAYER(memcmp)
+#define memcpy  LIBCLAYER(memcpy)
+#define memmove LIBCLAYER(memmove)
+#define memchr  LIBCLAYER(memchr)
+#define memset  LIBCLAYER(memset)
+
 void test_main()
 {
-    {
-        const size_t count = 1024;
-        char aaa[count];
-        char bbb[count];
-        for (size_t i = 0; i < count; ++i) aaa[i] = bbb[i] = i*i;
-        assert(LIBCLAYER(memcmp)(aaa, bbb, count) == 0);
+    { // memcmp
+        for (size_t i = 0; i < COUNT; ++i) aaa[i] = bbb[i] = i * i;
+        assert(memcmp(aaa, bbb, COUNT) == 0);
         aaa[123] = 1;
         bbb[123] = 2;
-        assert(LIBCLAYER(memcmp)(aaa, bbb, count) == -1);
+        assert(memcmp(aaa, bbb, COUNT) == -1);
         aaa[123] = 2;
         bbb[123] = 1;
-        assert(LIBCLAYER(memcmp)(aaa, bbb, count) == 1);
+        assert(memcmp(aaa, bbb, COUNT) == 1);
+    }
+
+    { // memcpy
+        for (size_t i = 0; i < COUNT; ++i) { aaa[i] = 0; bbb[i] = i * i; }
+        assert(memcpy(aaa, bbb, COUNT) == aaa);
+        for (size_t i = 0; i < COUNT; ++i) assert(aaa[i] == (char)(i * i));
+    }
+
+    { // memmove
+        for (size_t i = 0; i < COUNT; ++i) { aaa[i] = 0; bbb[i] = i * i; }
+        assert(memcpy(aaa, bbb, COUNT) == aaa);
+        for (size_t i = 0; i < COUNT; ++i) assert(aaa[i] == (char)(i * i));
+    }
+
+    { // memchr
+        for (size_t i = 0; i < COUNT; ++i) aaa[i] = 0;
+        aaa[256] = 'a';
+        assert(memchr(aaa, 'a', COUNT) == &aaa[256]);
+    }
+
+    { // memset
+        memset(&aaa[0],         'a', COUNT / 2);
+        memset(&aaa[COUNT / 2], 'b', COUNT / 2);
+        for (size_t i = 0;         i < COUNT / 2; ++i) assert(aaa[i] == 'a');
+        for (size_t i = COUNT / 2; i < COUNT;     ++i) assert(aaa[i] == 'b');
     }
 }