diff --git a/tests/test_cmdline.c b/tests/test_cmdline.c
index 43effa3..d3f6c51 100644
--- a/tests/test_cmdline.c
+++ b/tests/test_cmdline.c
@@ -1,6 +1,7 @@
 #include <kernaux/cmdline.h>
 
 #include <assert.h>
+#include <string.h>
 
 static const unsigned int ARGV_COUNT_MAX = 1024;
 static const unsigned int ARG_SIZE_MAX = 4096;
@@ -8,7 +9,7 @@ static const unsigned int ARG_SIZE_MAX = 4096;
 int main()
 {
     char error_msg[KERNAUX_CMDLINE_ERROR_MSG_SIZE_MAX];
-    unsigned int argc;
+    unsigned int argc = 1234;
     char *argv[ARGV_COUNT_MAX];
     char buffer[ARGV_COUNT_MAX * ARG_SIZE_MAX];
 
@@ -22,5 +23,12 @@ int main()
         ARG_SIZE_MAX
     ));
 
+    assert(strcmp(error_msg, "") == 0);
+    assert(argc == 0);
+
+    for (unsigned int index = 0; index < ARGV_COUNT_MAX; ++index) {
+        assert(argv[index] == KERNAUX_NULL);
+    }
+
     return 0;
 }