diff -r aed60ba37acf -r 24a012440dee test/utils_tests.c
--- a/test/utils_tests.c	Tue May 06 10:56:54 2014 +0200
+++ b/test/utils_tests.c	Tue May 06 12:03:16 2014 +0200
@@ -90,3 +90,54 @@
     free(teststr1);
     free(teststr2);
 }
+
+UCX_TEST(test_ucx_stream_copy) {
+    UcxBuffer *b1 = ucx_buffer_new(NULL, 64, UCX_BUFFER_DEFAULT);
+    UcxBuffer *b2 = ucx_buffer_new(NULL, 2, UCX_BUFFER_AUTOEXTEND);
+    
+    UCX_TEST_BEGIN
+    
+    ucx_buffer_write("01234567", 1, 8, b1);
+    ucx_buffer_write("abcdefgh", 1, 8, b1);
+    UCX_TEST_ASSERT(b1->size == 16, "failed to fill buffer b1");
+    ucx_buffer_seek(b1, 0, SEEK_SET);
+    
+    size_t ncp = ucx_stream_hcopy(b1, b2, ucx_buffer_read, ucx_buffer_write);
+    UCX_TEST_ASSERT(ncp == 16, "wrong number of copied bytes");
+    UCX_TEST_ASSERT(b2->size == 16, "b2 has wrong size");
+    UCX_TEST_ASSERT(memcmp(b1->space, b2->space, 16) == 0,
+            "b1 and b2 have not the same content");
+    
+    memset(b2->space, 0, b2->capacity);
+    b2->pos = 0;
+    b2->size = 0;
+    ucx_buffer_seek(b1, 0, SEEK_SET);
+    
+    FILE *file = tmpfile();
+    UCX_TEST_ASSERT(file, "test file cannot be opened, test aborted");
+    
+    ncp = ucx_stream_hcopy(b1, file, ucx_buffer_read, fwrite);
+    UCX_TEST_ASSERT(ncp == 16, "copied wrong number of bytes to file");
+    
+    fseek(file, 0, SEEK_SET);
+    
+    ncp = ucx_stream_hcopy(file, b2, fread, ucx_buffer_write);
+    UCX_TEST_ASSERT(ncp == 16, "copied wrong number of bytes from file");
+    
+    UCX_TEST_ASSERT(memcmp(b1->space, b2->space, 16) == 0,
+            "b1 and b2 content mismatch");
+    
+    fclose(file);
+
+    ucx_buffer_clear(b1);
+    ucx_buffer_seek(b2, 0, SEEK_SET);
+    ncp = ucx_stream_ncopy(b2, b1, ucx_buffer_read, ucx_buffer_write, 8);
+    UCX_TEST_ASSERT(ncp == 8, "copied wrong number of bytes with ncopy");
+    UCX_TEST_ASSERT(memcmp(b1->space, "01234567\0\0\0\0\0\0\0\0", 16) == 0,
+        "content wrong after ncopy");
+    
+    UCX_TEST_END
+    
+    ucx_buffer_free(b1);
+    ucx_buffer_free(b2);
+}