diff --git a/ini/CMakeLists.txt b/ini/CMakeLists.txt
index 2fb2b44..3864e32 100644
--- a/ini/CMakeLists.txt
+++ b/ini/CMakeLists.txt
@@ -23,6 +23,15 @@ enable_testing()
 
 add_executable(${PROJECT_NAME}_test ini_test.c sc_ini.c)
 
+if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+    if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR
+            "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+        target_compile_options(${PROJECT_NAME}_test PRIVATE -DSC_HAVE_WRAP)
+        target_compile_options(${PROJECT_NAME}_test PRIVATE -fno-builtin)
+        target_link_options(${PROJECT_NAME}_test PRIVATE -Wl,--wrap=ferror)
+    endif ()
+endif ()
+
 if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
     if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR
             "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
diff --git a/ini/ini_test.c b/ini/ini_test.c
index c824478..70e391b 100644
--- a/ini/ini_test.c
+++ b/ini/ini_test.c
@@ -491,6 +491,56 @@ void example(void)
     file_example();
 }
 
+#ifdef SC_HAVE_WRAP
+
+int fail_ferror = 0;
+
+int __real_ferror (FILE *stream);
+int __wrap_ferror (FILE *stream)
+{
+    if (fail_ferror) {
+        return -1;
+    }
+
+    return __real_ferror(stream);
+}
+
+int cb_fail(void *arg, int line, const char *section, const char *key,
+       const char *value)
+{
+    (void) arg;
+    (void) line;
+
+    printf("%s %s %s \n", section, key, value);
+    return 0;
+}
+
+void test_fail()
+{
+    int rc;
+    FILE *fp;
+    static const char *ini = " ;Sample \n"
+                             " [section] \n"
+                             "key = value0 #;comment\n"
+                             "      value1 \n"
+                             "      value2 ";
+
+    fp = fopen("config.ini", "w+");
+    fwrite(ini, 1, strlen(ini), fp);
+    fclose(fp);
+
+    fail_ferror = true;
+    rc = sc_ini_parse_file(NULL, cb_fail, "config.ini");
+    assert(rc == -1);
+    fail_ferror = false;
+}
+#else
+void test_fail()
+{
+
+}
+#endif
+
 int main()
 {
     example();
@@ -507,6 +557,7 @@ int main()
     test11();
     test12();
     test13();
+    test_fail();
 
     return 0;
 }
diff --git a/logger/log_test.c b/logger/log_test.c
index 20ad2d8..da2bc2a 100644
--- a/logger/log_test.c
+++ b/logger/log_test.c
@@ -88,6 +88,9 @@ void test1(void)
     fclose(fp);
 
     sc_log_term();
+
+    sc_log_init();
+    sc_log_term();
 }
 
 #ifdef SC_HAVE_WRAP
diff --git a/sc/sc_test.c b/sc/sc_test.c
index 730c960..a0368ca 100644
--- a/sc/sc_test.c
+++ b/sc/sc_test.c
@@ -163,7 +163,7 @@ void test_rand()
 
 #ifdef SC_HAVE_WRAP
 
-bool fail_snprintf;
+int fail_snprintf;
 
 int __wrap_snprintf(char *str, size_t size, const char *format, ...)
 {
@@ -178,7 +178,7 @@ int __wrap_snprintf(char *str, size_t size, const char *format, ...)
         return rc;
     }
 
-    return -1;
+    return fail_snprintf;
 }
 
 void fail_test()
@@ -186,15 +186,25 @@ void fail_test()
     char* t;
     char buf[32];
 
-    fail_snprintf = true;
+    fail_snprintf = -1;
     t = sc_bytes_to_size(buf, sizeof(buf), 2 * 1024);
     assert(t == NULL);
-    fail_snprintf = false;
+    fail_snprintf = 0;
 
-    fail_snprintf = true;
+    fail_snprintf = -1;
     t = sc_bytes_to_size(buf, sizeof(buf), 313);
     assert(t == NULL);
-    fail_snprintf = false;
+    fail_snprintf = 0;
+
+    fail_snprintf = 10000;
+    t = sc_bytes_to_size(buf, sizeof(buf), 2 * 1024);
+    assert(t == NULL);
+    fail_snprintf = 0;
+
+    fail_snprintf = 10000;
+    t = sc_bytes_to_size(buf, sizeof(buf), 313);
+    assert(t == NULL);
+    fail_snprintf = 0;
 }
 
 #else