add test case

test/test_all.scad

@@ -26,6 +26,7 @@ include <test_parse_number.scad>;
 include <test_cross_sections.scad>;
 include <test_paths2sections.scad>;
 include <test_in_polyline.scad>;
+include <test_triangulate.scad>;
 
 // Path
 include <test_circle_path.scad>;

test/test_triangulate.scad

@@ -0,0 +1,26 @@
+include <unittest.scad>;    
+include <triangulate.scad>; 
+
+module test_triangulate() {
+    echo("==== test_triangulate ====");
+
+
+    shape = [
+        [0, 0],
+        [10, 0],
+        [12, 5],
+        [5, 10],
+        [10, 15],
+        [0, 20],
+        [-5, 18],
+        [-18, 3],
+        [-4, 10]
+    ];
+
+    expected = [[8, 0, 1], [1, 2, 3], [3, 4, 5], [5, 6, 7], [8, 1, 3], [5, 7, 8], [8, 3, 5]];
+    actual = triangulate(shape);
+
+    assertEqualPoints(expected, actual);
+}
+
+test_triangulate();