diff -r 15f871f50bfd -r ee8cb27d8b8e test/utils_tests.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/utils_tests.c	Wed Aug 14 15:22:35 2013 +0200
@@ -0,0 +1,80 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2013 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "utils_tests.h"
+#include "ucx/buffer.h"
+
+UCX_TEST(test_ucx_fprintf) {
+    UcxBuffer *b1 = ucx_buffer_new(NULL, 32, UCX_BUFFER_AUTOEXTEND);
+    UcxBuffer *b2 = ucx_buffer_new(NULL, 4096, UCX_BUFFER_AUTOEXTEND);
+    
+    char *teststr1 = (char*)calloc(1, 1024);
+    char *teststr2 = (char*)calloc(1, 1024);
+    memset(teststr1, 'a', 1023);
+    memset(teststr2, 'b', 1023);
+    
+    UCX_TEST_BEGIN
+    
+    ucx_fprintf(b1, (write_func)ucx_buffer_write, "Hello %s", "World");
+    UCX_TEST_ASSERT(!strcmp(b1->space, "Hello World"), "wrong content in b1");
+    ucx_fprintf(b1, (write_func)ucx_buffer_write, "\nend.\n");
+    UCX_TEST_ASSERT(!strcmp(b1->space, "Hello World\nend.\n"),
+            "wrong content in b1 after second fprintf");
+    
+    ucx_fprintf(b2, (write_func)ucx_buffer_write, "%s%s", teststr1, teststr2);
+    UCX_TEST_ASSERT(!memcmp(b2->space, teststr1, 1023),
+            "wrong first half in b2");
+    UCX_TEST_ASSERT(!memcmp(b2->space+1023, teststr2, 1023),
+            "wrong second half in b2");
+    
+    UCX_TEST_END
+}
+
+UCX_TEST(test_ucx_asprintf) {
+    char *teststr1 = (char*)calloc(1, 1024);
+    char *teststr2 = (char*)calloc(1, 1024);
+    memset(teststr1, 'a', 1023);
+    memset(teststr2, 'b', 1023);
+    UcxAllocator *a = ucx_default_allocator();
+    
+    UCX_TEST_BEGIN
+    
+    sstr_t s1 = ucx_asprintf(a, "int: %d\nHello %s!", 123, "World");
+    UCX_TEST_ASSERT(s1.ptr, "s1.ptr is NULL");
+    UCX_TEST_ASSERT(s1.length == 21, "wrong length");
+    UCX_TEST_ASSERT(!sstrcmp(s1, S("int: 123\nHello World!")), "wrong content");
+    free(s1.ptr);
+    
+    sstr_t s2 = ucx_asprintf(a, "%s%s", teststr1, teststr2);
+    UCX_TEST_ASSERT(!memcmp(s2.ptr, teststr1, 1023),
+            "wrong first half in s2");
+    UCX_TEST_ASSERT(!memcmp(s2.ptr+1023, teststr2, 1023),
+            "wrong second half in s2");
+    
+    UCX_TEST_END
+}