Add tests for hang

.gitignore

@@ -19,3 +19,10 @@
 /include/Makefile.in
 /install-sh
 /missing
+/test-driver
+/test-suite.log
+/tests/test*.log
+/tests/test*.trs
+
+/tests/hang
+/tests/test_hang_segfault

Makefile.am

@@ -4,6 +4,17 @@ AM_CFLAGS = -std=c99 -I$(top_srcdir)/include
 
 lib_LIBRARIES = libkernaux.a
 
+TESTS = \
+	tests/test_hang_segfault
+
+noinst_PROGRAMS = \
+	$(TESTS) \
+	tests/hang
+
 libkernaux_a_SOURCES = \
 	src/arch/i386.S \
 	src/pfa.c
+
+tests_hang_SOURCES = $(libkernaux_a_SOURCES) tests/hang.c
+
+tests_test_hang_segfault_SOURCES = tests/test_hang_segfault.c

configure.ac

@@ -14,6 +14,8 @@ AC_CONFIG_FILES([
   include/Makefile
 ])
 
+PKG_CHECK_MODULES([CHECK], [check])
+
 AC_LANG([C])
 
 AM_PROG_AR

tests/hang.c

@@ -0,0 +1,8 @@
+#include <kernaux/arch/i386.h>
+
+int main()
+{
+    kernaux_arch_i386_hang();
+
+    return 0;
+}

tests/test_hang_segfault.c

@@ -0,0 +1,22 @@
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+
+#define __USE_POSIX2
+#include <stdio.h>
+
+int main()
+{
+    FILE *const fd = popen("tests/hang 2>&1", "r");
+    assert(fd != NULL);
+
+    char buffer[256];
+    char *const result = fgets(buffer, 256, fd);
+    assert(result == buffer);
+    assert(0 == strncmp(result, "Segmentation fault (core dumped)\n", 256));
+
+    const int status = pclose(fd);
+    assert(status != 0);
+
+    return 0;
+}