test added

Author: Fedr

source/MRTest/MRMeshBuilderTests.cpp

@@ -50,7 +50,10 @@ static void testBuildWithDups( const char * objMesh, int numVerts, int numComps
 
 TEST( MRMesh, MeshBuildWithDups )
 {
-    // this test case passed always
+    // first 4 triangles subdivide a square with center point,
+    // following 4 triangles subdivide the opposite side of same triangle,
+    // all 5 points are shared,
+    // expected that only center vetrex is duplicated and single connected component remains
     testBuildWithDups
     (
         "v 0 0.5 0\n"
@@ -68,7 +71,7 @@ TEST( MRMesh, MeshBuildWithDups )
         "f 1 4 5\n", 6, 1
     );
 
-    // this test start passing only after recent improvements (but will fail in case vertex reordering)
+    // same situation as above with the order of triangles changed
     testBuildWithDups
     (
         "v 0 0.5 0\n"
@@ -85,6 +88,29 @@ TEST( MRMesh, MeshBuildWithDups )
         "f 1 5 4\n"
         "f 3 5 1\n", 6, 1
     );
+
+    // first 4 triangles subdivide a square with center point,
+    // following 4 triangles subdivide same square with center point,
+    // 3 points on one diagonal are shared,
+    // it is divided properly on two components if the rings are computed from the smallest by id next triangle
+    testBuildWithDups
+    (
+        "v -1 0 -1\n"
+        "v  1 0 -1\n"
+        "v -1 0  1\n"
+        "v  1 0  1\n"
+        "v -1 0 -1\n"
+        "v  1 0  1\n"
+        "v  0 0  0\n"
+        "f 7 1 3\n"
+        "f 1 7 2\n"
+        "f 7 3 4\n"
+        "f 2 7 4\n"
+        "f 5 7 2\n"
+        "f 7 3 6\n"
+        "f 2 7 6\n"
+        "f 7 5 3\n", 10, 2
+    );
 }
 
 } //namespace MeshBuilder