From edb8c6114a20b806c56dd0225dd39e333ffb3ac3 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Wed, 22 Dec 2021 00:27:43 -0600
Subject: re-implement basic lily_assert_msg() macro

---
 CMakeLists.txt     |  1 +
 lily-test.h        | 25 +++++++++++++++++++++++--
 tests/assertions.c | 31 +++++++++++++++++++++++++++++++
 tests/helpers.c    |  2 +-
 tests/main.c       |  2 ++
 tests/run_test.c   |  2 ++
 tests/tests.h      |  7 ++++++-
 7 files changed, 66 insertions(+), 4 deletions(-)
 create mode 100644 tests/assertions.c
 create mode 100644 tests/run_test.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e4dcb5..baa2701 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ include_directories(${CMAKE_SOURCE_DIR})
 set (TEST_SRC ${CMAKE_SOURCE_DIR}/tests)
 add_executable(lily-metatest
   ${TEST_SRC}/main.c
+  ${TEST_SRC}/assertions.c
   ${TEST_SRC}/helpers.c)
 set_target_properties(lily-metatest PROPERTIES
   C_STANDARD 99
diff --git a/lily-test.h b/lily-test.h
index a94f292..1894127 100644
--- a/lily-test.h
+++ b/lily-test.h
@@ -1,12 +1,33 @@
 #ifndef LILY_TEST_H
 #define LILY_TEST_H
 
+#include <stddef.h>
+
+/* gives a string like 'some/filename:xxx' */
+#define STR_IMP(x) #x
+#define STR(x) STR_IMP(x)
 /* define SOURCE_PATH_SIZE to strip away the
    leading parts of the full compilation path */
 #ifndef SOURCE_PATH_SIZE
-#define LILY_FILENAME __FILE__
+#define LILY_LOCATION "" __FILE__ ":" STR(__LINE__)
 #else
-#define LILY_FILENAME (__FILE__ + SOURCE_PATH_SIZE)
+#define LILY_LOCATION (("" __FILE__ ":" STR(__LINE__)) + SOURCE_PATH_SIZE)
 #endif
 
+struct lily_test_result_t {
+   int error;
+   const char *message;
+   const char *location;
+};
+
+typedef struct lily_test_result_t lily_test;
+#define LILY_SUCCESS (struct lily_test_result_t){ 0, NULL, NULL }
+
+// assertions
+#define lily_assert_msg(statement, message) do {			\
+      if(!(statement)) {						\
+	 return (struct lily_test_result_t){1, (message), LILY_LOCATION}; \
+      }									\
+   } while(0)
+
 #endif
diff --git a/tests/assertions.c b/tests/assertions.c
new file mode 100644
index 0000000..0c443b5
--- /dev/null
+++ b/tests/assertions.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "lily-test.h"
+#include "tests.h"
+
+// basic assertion
+lily_test wrap_assert_msg(int statement, const char *message)
+{
+   // if you move the location of this line, BE SURE TO UPDATE THE
+   // TEST BELOW so that it expects the correct line!
+   lily_assert_msg(statement, message);
+   return LILY_SUCCESS;
+}
+
+const char* basic_assertion()
+{
+   lily_test result = wrap_assert_msg(1, "should succeed");
+   if (result.error != 0)
+      return "assert_msg() incorrectly returned non-zero error on true statement!";
+
+   result = wrap_assert_msg(0, "should fail");
+   if (result.error == 0)
+      return "assert_msg() incorrectly returned zero error on false statement!";
+   if (strcmp(result.message, "should fail") != 0)
+      return "assert_msg() returned with incorrect message!";
+   if (strcmp(result.location, "tests/assertions.c:12") != 0)
+      return "assert_msg() returned with incorrect location!";
+
+   return 0;
+}
diff --git a/tests/helpers.c b/tests/helpers.c
index 42a0724..cdf72b4 100644
--- a/tests/helpers.c
+++ b/tests/helpers.c
@@ -8,7 +8,7 @@ void run_test(const char *name, const char* (*test)())
    printf("%s... ", name);
    const char *result = test();
    if (result != 0) {
-      printf("FAILED (%s)\n", result);
+      printf("FAILED: %s\n", result);
    }
    else
       printf("OK\n");
diff --git a/tests/main.c b/tests/main.c
index a3de945..ccc7310 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -8,6 +8,8 @@
 
 int main()
 {
+   run_test("check basic assert_msg()", basic_assertion);
+   
    printf("all tests finished.\n");
    return 0;
 }
diff --git a/tests/run_test.c b/tests/run_test.c
new file mode 100644
index 0000000..3dd0c4b
--- /dev/null
+++ b/tests/run_test.c
@@ -0,0 +1,2 @@
+#include "lily-test.h"
+
diff --git a/tests/tests.h b/tests/tests.h
index cbe0f02..7b3dc48 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -1,7 +1,12 @@
 #ifndef LILY_META_TESTS_H
 #define LILY_META_TESTS_H
 
-void run_test(const char *name, const char* (*fp)());
+void run_test(const char *name, const char* (*test)());
 int validate_message(const char* received, const char* expected,
 		     const char* FILE, unsigned int LINE);
+
+// test cases
+const char* basic_assertion();
+
+
 #endif
-- 
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