From 3d0008b49698d49fa3a7d4c851c93c4092c368bb Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Thu, 24 Oct 2024 12:29:18 +0100
Subject: [PATCH] Write test framework

---
 scripts/build.sh |  3 +++
 tests/testing.c  | 21 +++++++++++++++++
 tests/testing.h  | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 84 insertions(+)
 create mode 100644 tests/testing.c
 create mode 100644 tests/testing.h

diff --git a/scripts/build.sh b/scripts/build.sh
index e7e86e1..594d166 100644
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -5,6 +5,9 @@ CFLAGS="$CFLAGS -Og -ggdb"
 
 mkdir -p build
 
+# Build tests
+clang $CFLAGS -Itests -c -o build/testing.o tests/testing.c
+
 # Build application
 clang $CFLAGS -c -o build/main.o app/main.c
 clang $CFLAGS -o build/infix-calculator build/main.o
diff --git a/tests/testing.c b/tests/testing.c
new file mode 100644
index 0000000..d911fb8
--- /dev/null
+++ b/tests/testing.c
@@ -0,0 +1,21 @@
+#include "testing.h"
+
+#include <stdio.h>
+
+test_run_t test_run;
+
+void testing_fail_msg(const char *func, const char *file, int line)
+{
+	printf("%s: failed assert @ %s:%d\n", func, file, line);
+}
+
+void testing_end_msg(void)
+{
+	const double success_rate
+	    = 1 - (double)test_run.fail_count / (double)test_run.test_count;
+	printf(
+	    "%d tests ran (%d assertions), "
+	    "%0.2f%% successful (%d failures)\n",
+	    test_run.test_count, test_run.assertion_count, 100 * success_rate,
+	    test_run.fail_count);
+}
diff --git a/tests/testing.h b/tests/testing.h
new file mode 100644
index 0000000..8e66d9b
--- /dev/null
+++ b/tests/testing.h
@@ -0,0 +1,60 @@
+#ifndef TESTING_H
+#define TESTING_H
+
+#include <stdlib.h>
+#include <string.h>
+
+#define TESTING_BEGIN() \
+	do { \
+		memset(&test_run, 0, sizeof(test_run)); \
+	} while (0)
+
+#define TESTING_END() \
+	do { \
+		testing_end_msg(); \
+		return 0 == test_run.fail_count ? EXIT_SUCCESS : EXIT_FAILURE; \
+	} while (0)
+
+#define RUN_TEST(test) \
+	do { \
+		++test_run.test_count; \
+		test(); \
+	} while (0)
+
+#define ASSERT_FAIL() \
+	do { \
+		++test_run.fail_count; \
+		testing_fail_msg(__func__, __FILE__, __LINE__); \
+		return; \
+	} while (0)
+
+#define ASSERT_TRUE(p) \
+	do { \
+		++test_run.assertion_count; \
+		if (!(p)) \
+			ASSERT_FAIL(); \
+	} while (0)
+
+#define ASSERT_FALSE(p) ASSERT_TRUE(!(p))
+#define ASSERT_EQUAL(x, y) ASSERT_TRUE((x) == (y))
+#define ASSERT_NOT_EQUAL(x, y) ASSERT_TRUE((x) != (y))
+#define ASSERT_NULL(p) ASSERT_TRUE(NULL == (p))
+#define ASSERT_NOT_NULL(p) ASSERT_TRUE(NULL != (p))
+#define ASSERT_GT(x, y) ASSERT_TRUE((y) > (x))
+#define ASSERT_GE(x, y) ASSERT_TRUE((y) >= (x))
+#define ASSERT_LT(x, y) ASSERT_TRUE((y) < (x))
+#define ASSERT_LE(x, y) ASSERT_TRUE((y) <= (x))
+#define ASSERT_MEM_EQUAL(p, q, n) ASSERT_TRUE(memcmp(p, q, n) == 0)
+
+typedef struct {
+	int test_count;
+	int fail_count;
+	int assertion_count;
+} test_run_t;
+
+extern test_run_t test_run;
+
+void testing_fail_msg(const char *func, const char *file, int line);
+void testing_end_msg(void);
+
+#endif