From 88d383692642eac9113934c43c800c8f0b2edf26 Mon Sep 17 00:00:00 2001
From: Gwendolyn <gwendolyn.k@outlook.de>
Date: Mon, 3 Jan 2022 15:21:26 +0100
Subject: [PATCH] cute optional macros for the main function of a test

---
 examples/all.c               | 20 +++++++++-----------
 examples/assertions.c        |  7 ++-----
 examples/expect_assertions.c |  7 ++-----
 examples/fail.c              |  7 ++-----
 examples/float.c             |  7 ++-----
 examples/groups.c            |  7 ++-----
 examples/parameterized.c     |  7 ++-----
 examples/skip.c              |  7 ++-----
 xtest.c                      |  7 ++++---
 xtest.h                      | 11 +++++++++++
 10 files changed, 38 insertions(+), 49 deletions(-)

diff --git a/examples/all.c b/examples/all.c
index 9d77b1a..e3e7958 100644
--- a/examples/all.c
+++ b/examples/all.c
@@ -9,14 +9,12 @@ void example_groups();
 void example_parameterized();
 void example_skip();
 
-
-int main(int argc, char ** argv) {
-    xtest_run_group(example_assertions);
-    xtest_run_group(example_expect_assertions);
-    xtest_run_group(example_fail);
-    xtest_run_group(example_float);
-    xtest_run_group(example_groups);
-    xtest_run_group(example_parameterized);
-    xtest_run_group(example_skip);
-    return xtest_complete();
-}
\ No newline at end of file
+XTEST_MAIN({
+   xtest_run_group(example_assertions);
+   xtest_run_group(example_expect_assertions);
+   xtest_run_group(example_fail);
+   xtest_run_group(example_float);
+   xtest_run_group(example_groups);
+   xtest_run_group(example_parameterized);
+   xtest_run_group(example_skip);
+})
diff --git a/examples/assertions.c b/examples/assertions.c
index 0cc5c9b..59b18a5 100644
--- a/examples/assertions.c
+++ b/examples/assertions.c
@@ -99,8 +99,5 @@ void example_assertions() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_assertions();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_assertions)
+#endif //XTEST_ALL_EXAMPLES
diff --git a/examples/expect_assertions.c b/examples/expect_assertions.c
index d435018..210dbd7 100644
--- a/examples/expect_assertions.c
+++ b/examples/expect_assertions.c
@@ -39,8 +39,5 @@ void example_expect_assertions() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_expect_assertions();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_expect_assertions)
+#endif
diff --git a/examples/fail.c b/examples/fail.c
index 5d70c02..29679d8 100644
--- a/examples/fail.c
+++ b/examples/fail.c
@@ -181,8 +181,5 @@ void example_fail() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_fail();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_fail)
+#endif
diff --git a/examples/float.c b/examples/float.c
index 9548c05..ed773f1 100644
--- a/examples/float.c
+++ b/examples/float.c
@@ -39,8 +39,5 @@ void example_float() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_float();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_float)
+#endif
diff --git a/examples/groups.c b/examples/groups.c
index b965ee3..6b427ff 100644
--- a/examples/groups.c
+++ b/examples/groups.c
@@ -96,8 +96,5 @@ void example_groups() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_groups();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_groups)
+#endif
diff --git a/examples/parameterized.c b/examples/parameterized.c
index 7289bde..189b4c2 100644
--- a/examples/parameterized.c
+++ b/examples/parameterized.c
@@ -79,8 +79,5 @@ void example_parameterized() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_parameterized();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_parameterized)
+#endif
diff --git a/examples/skip.c b/examples/skip.c
index 489f1ca..0f97a27 100644
--- a/examples/skip.c
+++ b/examples/skip.c
@@ -54,8 +54,5 @@ void example_skip() {
 }
 
 #ifndef XTEST_ALL_EXAMPLES
-int main(int argc, char **argv) {
-    example_skip();
-    return xtest_complete();
-}
-#endif
\ No newline at end of file
+XTEST_RUN_MAIN(example_skip)
+#endif
diff --git a/xtest.c b/xtest.c
index 92842be..274b344 100644
--- a/xtest.c
+++ b/xtest.c
@@ -1,5 +1,4 @@
 #include <setjmp.h>
-#include <math.h>
 
 #define XTEST_SOURCE
 
@@ -276,8 +275,10 @@ void
 xtest_assert_float(double expected, double actual, int precision, int invert, const char *expression, const char *file,
                    int line) {
 
-    double epsilon = pow(10, -(precision));
-    double diff = fabs(expected - actual);
+    double epsilon = 1.0;
+    for (int i = 0; i < precision; ++i) epsilon /= 10.0;
+    double diff = expected - actual;
+    if (diff < 0) diff = -diff;
     int equals = diff < epsilon;
     int failed = invert == equals; // invert = true: fail if equals, invert = false: fail if not equals
     if (!failed) return;
diff --git a/xtest.h b/xtest.h
index d7cd7e8..b9a37df 100644
--- a/xtest.h
+++ b/xtest.h
@@ -130,4 +130,15 @@ int xtest_complete();
 #define xtest_assert_mem_is_not(actual, expected, len) xtest_assert_(memcmp(actual, expected, len) != 0, #actual " is not " #expected " (" #len " bytes)", NULL, NULL, 1)
 
 
+#define XTEST_RUN_MAIN(fn) int main(int argc, char ** argv) { \
+        fn();                                                 \
+        return xtest_complete();                              \
+    }
+
+
+#define XTEST_MAIN(block) int main(int argc, char ** argv) { \
+        block                                                     \
+        return xtest_complete();                                  \
+    }
+
 #endif //XTEST_XTEST_H