1 files changed, 83 insertions, 0 deletions
diff --git a/run_tests.c b/run_tests.c
new file mode 100644
index 0000000..efabe25
--- /dev/null
+++ b/run_tests.c
@@ -0,0 +1,83 @@
+/* Copyright (C) 2017 Jakob Kreuze, All Rights Reserved.
+
+   Skullfuck is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation, either version 3 of the License, or (at
+   your option) any later version.
+
+   Skullfuck is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Skullfuck. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <sys/types.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define EXIT_SUCCESS 0
+#define EXIT_FAILURE 1
+
+
+/* Exits with a failing status code if a test binary does not exist. */
+static void assert_test_existence(void) {
+    if (access("hello", F_OK) == -1) {
+        fprintf(stderr, "Hello world binary does not exist.\n");
+        exit(EXIT_FAILURE);
+    } else if (access("rot13", F_OK) == -1) {
+        fprintf(stderr, "rot13 binary does not exist.\n");
+        exit(EXIT_FAILURE);
+    }
+}
+
+
+/* Prints `msg` to error output and quits with a failing status code. */
+static void panic(char *msg) {
+    fprintf(stderr, msg);
+    fprintf(stderr, "Tests failed! Terminating!");
+    exit(EXIT_FAILURE);
+}
+
+
+/* Tests the hello world binary. */
+static void test_hello_world(void) {
+    int   pipefd[2];
+    char  *buf;
+    pid_t pid;
+
+    if (pipe(pipefd) == -1) {
+        perror("pipe");
+        exit(EXIT_FAILURE);
+    }
+
+    if ((pid = fork()) == -1) {
+        perror("fork");
+        exit(EXIT_FAILURE);
+    }
+
+    if (pid == 0) {
+        dup2(pipefd[1], 1);
+        close(pipefd[0]);
+        execl("hello", "hello", NULL);
+    } else {
+        buf = malloc(0x100);
+        dup2(pipefd[0], 0);
+        close(pipefd[1]);
+        fgets(buf, 0x100, stdin);
+        if (!strcmp(buf, "Hello World!"))
+            panic("Hello World binary did not properly output text.\n");
+        free(buf);
+    }
+}
+
+
+int main(int argc, char **argv) {
+    assert_test_existence();
+    test_hello_world();
+    printf("All tests passed.\n");
+}