1 files changed, 21 insertions, 0 deletions
diff --git a/core/tests/diop.c b/core/tests/diop.c
new file mode 100644
index 0000000..1f9aea4
--- /dev/null
+++ b/core/tests/diop.c
@@ -0,0 +1,21 @@
+#include <tri.h>
+
+static tri_t f;
+
+static tri_t filter(tri_t t)
+{
+	tri_t r = tri_diop(OON, OOO, OOP, t, f);
+	return r;
+}
+
+int main()
+{
+	/* very much not enough testing */
+	f = tri_parse_default("111111111", 9);
+
+	tri_t a = tri_parse_default("iii000111", 9);
+	tri_t b = tri_parse_default("i01i01i01", 9);
+
+	tri_t r = tri_diop(NNN, NNN, NNN, a, b);
+	assert(tri_eq(filter(r), tri_parse_default("iiiiiiiii", 9)));
+}