Add test for Simplify adding cracks (#1263)

* Add test CurvedWallSimplify

* Change code formatting to appease check_format

* Fix two remaining format issues

* Move CurvedWallSimplify to boolean_test and call it DISABLED_SimplifyCracks

Author: tomasf

test/boolean_test.cpp

@@ -161,6 +161,23 @@ TEST(Boolean, Simplify) {
   EXPECT_EQ(result2.NumTri(), 20);
 }
 
+TEST(Boolean, DISABLED_SimplifyCracks) {
+  Manifold cylinder =
+      Manifold::Cylinder(2, 50, 50, 180)
+          .Rotate(
+              -89.999999999999)  // Rotating by -90 makes the result too perfect
+          .Translate(vec3(50, 0, 50));
+  Manifold cube = Manifold::Cube(vec3(100, 2, 50));
+  Manifold refined = (cylinder + cube).RefineToLength(0.13071895424836602);
+  Manifold deformed =
+      refined.Warp([](vec3& p) { p.y += p.x - (p.x * p.x) / 100.0; });
+  Manifold simplified = deformed.Simplify(0.005);
+
+  // If Simplify adds cracks, volume decreases and surface area increases
+  EXPECT_NEAR(simplified.Volume(), 17848, 1);
+  EXPECT_NEAR(simplified.SurfaceArea(), 20930, 1);
+}
+
 TEST(Boolean, NoRetainedVerts) {
   Manifold cube = Manifold::Cube(vec3(1), true);
   Manifold oct = Manifold::Sphere(1, 4);