Add tests

Author: Daniel-Cortez

source/compiler/tests/__timestamp.meta

@@ -0,0 +1,8 @@
+{
+  'test_type': 'runtime',
+  'output': """
+result: 0
+__timestamp.amx returns 0
+  """,
+  'should_fail': False
+}

source/compiler/tests/__timestamp.pwn

@@ -0,0 +1,13 @@
+#include <console>
+#include <string>
+
+main()
+{
+	new day_seconds = __timestamp % (60 * 60 * 24);
+	new hour = day_seconds / (60 * 60);
+	new minute = (day_seconds % (60 * 60)) / 60;
+	new second = day_seconds % 60;
+	new buf[9];
+	strformat(buf, _, _, "%02d:%02d:%02d", hour, minute, second);
+	printf("result: %d\n", strcmp(buf, __time));
+}