Added fp_t division

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/test_fixed_point.cpp b/tests/test_fixed_point.cpp
index 6d1a594..8c5c269 100644
--- a/tests/test_fixed_point.cpp
+++ b/tests/test_fixed_point.cpp
@@ -50,3 +50,49 @@ TEST_CASE("fp_t multiplication drops percision under 1 ULP") {
     fp_t b = fp_t::from_raw(0);
     CHECK(a * a == b);
 }
+
+TEST_CASE("fp_t division is basic") {
+    fp_t a = fp_t::from_int(10);
+    fp_t b = fp_t::from_int(2);
+    fp_t c = fp_t::from_int(5);
+    CHECK(a / b == c);
+}
+
+TEST_CASE("fp_t division is sign-symmetric") {
+    fp_t a = fp_t::from_int(1);
+    fp_t b = fp_t::from_raw(-3);
+    fp_t neg_a = fp_t::from_raw(-a.raw);
+    fp_t neg_b = fp_t::from_raw(-b.raw);
+    CHECK(neg_a / b == a / neg_b);
+}
+
+TEST_CASE("fp_t division rounds to nearest") {
+    fp_t a = fp_t::from_int(1);
+    fp_t b = fp_t::from_int(3);
+    fp_t c = fp_t::from_raw(21845);
+    CHECK(a / b == c);
+}
+
+TEST_CASE("fp_t division handles negative operands") {
+    fp_t a = fp_t::from_int(-10);
+    fp_t b = fp_t::from_int(2);
+    fp_t c = fp_t::from_int(-5);
+    CHECK(a / b == c);
+
+    fp_t d = fp_t::from_int(10);
+    fp_t e = fp_t::from_int(-2);
+    fp_t f = fp_t::from_int(-5);
+    CHECK(d / e == f);
+
+    fp_t g = fp_t::from_int(-10);
+    fp_t h = fp_t::from_int(-2);
+    fp_t i = fp_t::from_int(5);
+    CHECK(g / h == i);
+}
+
+TEST_CASE("fp_t division truncates precision below 1 ULP") {
+    fp_t a = fp_t::from_raw(1);
+    fp_t b = fp_t::from_int(100000);
+    fp_t c = fp_t::from_raw(0);
+    CHECK(a / b == c);
+}