3 files changed, 105 insertions, 0 deletions
diff --git a/tests/string.c b/tests/string.c
new file mode 100644
index 0000000..e3d68f4
--- /dev/null
+++ b/tests/string.c
@@ -0,0 +1,14 @@
+#include "lisiblestd/memory.h"
+#include "test.h"
+#include <lisiblestd/string.h>
+
+void t_String_from_str(void) {
+  String string;
+  String_from_str(&system_allocator, &string, "Some string");
+  T_ASSERT(strncmp(string.value, "Some string", 11));
+  T_ASSERT_EQ(string.length, 11);
+
+  String_destroy(&system_allocator, &string);
+}
+
+TEST_SUITE(TEST(t_String_from_str))
diff --git a/tests/test.h b/tests/test.h
new file mode 100644
index 0000000..223abf5
--- /dev/null
+++ b/tests/test.h
@@ -0,0 +1,74 @@
+#ifndef LSTD_TESTS_TEST_H
+#define LSTD_TESTS_TEST_H
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define TEST_DATA_PATH "../cuttereng/tests/tests_data/"
+
+typedef void (*TestFn)(void);
+
+typedef struct {
+  const char *name;
+  TestFn fn;
+} Test;
+
+extern Test tests[];
+extern size_t test_count;
+
+inline static void assert0(int boolean, const char *msg) {
+  if (!boolean) {
+    fprintf(stderr, "%s", msg);
+    exit(1);
+  }
+}
+
+inline static void assert(int boolean, const char *fmt, ...) {
+  if (!boolean) {
+    va_list args;
+    va_start(args, fmt);
+    fprintf(stderr, fmt, args);
+    va_end(args);
+    exit(1);
+  }
+}
+
+#define T_ASSERT(expr) T_ASSERT_MSG(expr, "%s", #expr)
+
+#define STRINGIFY(x) #x
+#define TOSTRING(x) STRINGIFY(x)
+
+#define T_ASSERT_MSG(expr, fmt, ...)                                           \
+  do {                                                                         \
+    assert((expr),                                                             \
+           "Assertion failed in " __FILE__ ":" TOSTRING(__LINE__) ": " fmt     \
+                                                                  "\n",        \
+           __VA_ARGS__);                                                       \
+  } while (0)
+#define T_ASSERT_MSG0(expr, msg)                                               \
+  do {                                                                         \
+    assert0((expr), "Assertion failed in " __FILE__                            \
+                    ":" TOSTRING(__LINE__) ": " msg "\n");                     \
+  } while (0)
+
+#define T_ASSERT_EQ(a, b) T_ASSERT_MSG0((a == b), #a " != " #b)
+#define T_ASSERT_FLOAT_EQ(a, b, epsilon)                                       \
+  T_ASSERT_MSG0((fabs(a - b) < epsilon), #a " != " #b)
+
+#define T_ASSERT_NULL(a) T_ASSERT_MSG0((a == NULL), #a " is not NULL")
+#define T_ASSERT_NOT_NULL(a) T_ASSERT_MSG0((a != NULL), #a " is NULL")
+
+#define T_ASSERT_STR_EQ(a, b, length)                                          \
+  T_ASSERT_MSG0((strncmp(a, b, length) == 0), #a " != " #b)
+
+#define ARG_COUNT(...) (sizeof((Test[]){__VA_ARGS__}) / sizeof(Test))
+#define TEST_SUITE(...)                                                        \
+  Test tests[] = {__VA_ARGS__};                                                \
+  size_t test_count = ARG_COUNT(__VA_ARGS__);
+#define TEST(x)                                                                \
+  { .name = #x, .fn = x }
+
+#endif // LSTD_TESTS_TEST_H
diff --git a/tests/test_runner.c b/tests/test_runner.c
new file mode 100644
index 0000000..f05cd02
--- /dev/null
+++ b/tests/test_runner.c
@@ -0,0 +1,17 @@
+#include "test.h"
+
+#define ANSI_COLOR_GREEN "\x1b[32m"
+#define ANSI_COLOR_RESET "\x1b[0m"
+
+int main(int argc, char **argv) {
+  (void)argc;
+  (void)argv;
+
+  for (size_t i = 0; i < test_count; i++) {
+    fprintf(stderr, "Running test: %s...\n", tests[i].name);
+    tests[i].fn();
+    fprintf(stderr, ANSI_COLOR_GREEN " OK" ANSI_COLOR_RESET "\n");
+  }
+
+  return 0;
+}