Add unit test for common/buf.c

t/buf-simple.c

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define _POSIX_C_SOURCE 200809L
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <cmocka.h>
+#include "common/buf.h"
+#include "common/mem.h"
+
+static void
+test_expand_title(void **state)
+{
+	(void)state;
+
+	struct buf s = BUF_INIT;
+
+	char TEMPLATE[] = "foo ~/bar";
+	char expect[4096];
+	snprintf(expect, sizeof(expect), "foo %s/bar", getenv("HOME"));
+
+	buf_add(&s, TEMPLATE);
+	assert_string_equal(s.data, TEMPLATE);
+	assert_int_equal(s.len, strlen(TEMPLATE));
+
+	// Resolve ~
+	buf_expand_tilde(&s);
+	assert_string_equal(s.data, expect);
+	assert_int_equal(s.len, strlen(expect));
+
+	setenv("bar", "BAR", 1);
+
+	// Resolve $bar and ${bar}
+	s.len = 0;
+	buf_add(&s, "foo $bar baz");
+	buf_expand_shell_variables(&s);
+	assert_string_equal(s.data, "foo BAR baz");
+	assert_int_equal(s.len, 11);
+
+	s.len = 0;
+	buf_add(&s, "foo ${bar} baz");
+	buf_expand_shell_variables(&s);
+	assert_string_equal(s.data, "foo BAR baz");
+	assert_int_equal(s.len, 11);
+
+	// Don't resolve $()
+	s.len = 0;
+	buf_add(&s, "foo $(bar) baz");
+	buf_expand_shell_variables(&s);
+	assert_string_equal(s.data, "foo $(bar) baz");
+	assert_int_equal(s.len, 14);
+
+	unsetenv("bar");
+	free(s.data);
+}
+
+int main(int argc, char **argv)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_expand_title),
+	};
+
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}