[test][intersection][union] Add cases where all points of g1 are the same as some points of g2.

test/algorithms/overlay/overlay_cases.hpp

@@ -528,6 +528,22 @@ static std::string case_102[2] =
     "POLYGON((3 6,4 5,5 4,3 2,1 4,3 6),(4 5,3 4,3.5 3.5,4 4,4 5))"
 };
 
+static std::string case_103[2] =
+{
+    // intersection
+    // all points of [1] the same as some points of [0]
+    "POLYGON((0 0,0 1,1 1,1 0,0 0))",
+    "POLYGON((0 0,0 1,1 0,0 0))"
+};
+
+static std::string case_104[2] =
+{
+    // union in hole
+    // all points of [1] the same as some points of [0]
+    "POLYGON((0 0,0 10,10 10,10 0,0 0),(1 1,9 1,9 9,1 9,1 1))",
+    "POLYGON((1 1,1 9,9 9,9 1,1 1))"
+};
+
 static std::string case_many_situations[2] = {
         "POLYGON((2 6,2 14,10 18,18 14,18 6,16 5,14 4,12 3,10 2,8 3,6 4,4 5,2 6))",
         "POLYGON((2 6,2 7,2 8,2 9,2 10,2 11,2 12,1 14"

test/algorithms/set_operations/intersection/intersection.cpp

@@ -339,6 +339,13 @@ void test_areal()
         case_102[0], case_102[1],
         0, -1, 3.1875);
 
+    test_one<Polygon, Polygon, Polygon>("case_103",
+        case_103[0], case_103[1],
+        1, -1, 0.5);
+    test_one<Polygon, Polygon, Polygon>("case_104",
+        case_104[0], case_104[1],
+        0, -1, 0.0);
+
     test_one<Polygon, Polygon, Polygon>("mysql_21964049",
         mysql_21964049[0], mysql_21964049[1],
         0, -1, 0.0);

test/algorithms/set_operations/union/union.cpp

@@ -237,6 +237,13 @@ void test_areal()
     test_one<Polygon, Polygon, Polygon>("102",
                 case_102[0], case_102[1], 1, 1, 17, 8.75);
 
+    test_one<Polygon, Polygon, Polygon>("103",
+                case_103[0], case_103[1],
+                1, 0, 5, 1.0);
+    test_one<Polygon, Polygon, Polygon>("104",
+                case_104[0], case_104[1],
+                1, 0, 5, 100.0);
+
     /*
     test_one<Polygon, Polygon, Polygon>(102,
         simplex_normal[0], simplex_reversed[1],