From 052144cabb126efe925a96f8a0597a0f2005d206 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Mon, 23 Feb 2026 20:36:05 +0100
Subject: add metalang99 testsuite (preprocessor stress testing)

---
 test/external/metalang99/tests/either.c | 66 +++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 test/external/metalang99/tests/either.c

(limited to 'test/external/metalang99/tests/either.c')

diff --git a/test/external/metalang99/tests/either.c b/test/external/metalang99/tests/either.c
new file mode 100644
index 0000000..4a29fb9
--- /dev/null
+++ b/test/external/metalang99/tests/either.c
@@ -0,0 +1,66 @@
+#include <metalang99/assert.h>
+#include <metalang99/either.h>
+#include <metalang99/nat.h>
+
+int main(void) {
+
+#define MATCH_IMPL(either)  ML99_match(v(either), v(MATCH_))
+#define MATCH_left_IMPL(x)  v(ML99_ASSERT_UNEVAL(x == 18))
+#define MATCH_right_IMPL(x) v(ML99_ASSERT_UNEVAL(x == 4))
+
+    // Pattern matching
+    {
+        ML99_EVAL(ML99_call(MATCH, ML99_left(v(18))));
+        ML99_EVAL(ML99_call(MATCH, ML99_right(v(4))));
+    }
+
+#undef MATCH_IMPL
+#undef MATCH_left_IMPL
+#undef MATCH_right_IMPL
+
+#define VAL v(abc ? +-148 % "hello world")
+
+    // ML99_isLeft
+    {
+        ML99_ASSERT(ML99_isLeft(ML99_left(VAL)));
+        ML99_ASSERT(ML99_not(ML99_isLeft(ML99_right(VAL))));
+    }
+
+    // ML99_IS_LEFT
+    {
+        ML99_ASSERT_UNEVAL(ML99_IS_LEFT(ML99_LEFT(VAL)));
+        ML99_ASSERT_UNEVAL(!ML99_IS_LEFT(ML99_RIGHT(VAL)));
+    }
+
+    // ML99_isRight
+    {
+        ML99_ASSERT(ML99_isRight(ML99_right(VAL)));
+        ML99_ASSERT(ML99_not(ML99_isRight(ML99_left(VAL))));
+    }
+
+    // ML99_IS_RIGHT
+    {
+        ML99_ASSERT_UNEVAL(ML99_IS_RIGHT(ML99_RIGHT(VAL)));
+        ML99_ASSERT_UNEVAL(!ML99_IS_RIGHT(ML99_LEFT(VAL)));
+    }
+
+    // ML99_eitherEq
+    {
+        ML99_ASSERT(ML99_eitherEq(v(ML99_natEq), ML99_left(v(123)), ML99_left(v(123))));
+        ML99_ASSERT(ML99_not(ML99_eitherEq(v(ML99_natEq), ML99_left(v(18)), ML99_left(v(123)))));
+
+        ML99_ASSERT(ML99_eitherEq(v(ML99_natEq), ML99_right(v(123)), ML99_right(v(123))));
+        ML99_ASSERT(ML99_not(ML99_eitherEq(v(ML99_natEq), ML99_right(v(18)), ML99_right(v(123)))));
+
+        ML99_ASSERT(ML99_not(ML99_eitherEq(v(ML99_natEq), ML99_left(v(123)), ML99_right(v(123)))));
+        ML99_ASSERT(ML99_not(ML99_eitherEq(v(ML99_natEq), ML99_left(v(123)), ML99_right(v(4)))));
+        ML99_ASSERT(ML99_not(ML99_eitherEq(v(ML99_natEq), ML99_right(v(123)), ML99_left(v(123)))));
+        ML99_ASSERT(ML99_not(ML99_eitherEq(v(ML99_natEq), ML99_right(v(123)), ML99_left(v(4)))));
+    }
+
+    // ML99_unwrapLeft
+    { ML99_ASSERT_EQ(ML99_unwrapLeft(ML99_left(v(123))), v(123)); }
+
+    // ML99_unwrapRight
+    { ML99_ASSERT_EQ(ML99_unwrapRight(ML99_right(v(123))), v(123)); }
+}
-- 
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