Increase testNodeJs timeout to 30s

Tweak shape-contour intersection test

buildSrc/src/main/kotlin/org/openrndr/extra/convention/kotlin-multiplatform.gradle.kts

@@ -76,7 +76,13 @@ kotlin {
 
     js(IR) {
         browser()
-        nodejs()
+        nodejs {
+            testTask {
+                useMocha {
+                    timeout = "30s"
+                }
+            }
+        }
     }
 
     sourceSets {

orx-composition/src/commonTest/kotlin/TestComposition.kt

@@ -45,7 +45,13 @@ class TestComposition {
 }
 
 class TestCompositionIntersections {
+    @Test
+    fun `use a shape as a mask for line segments`() {
+        // Make sure intersections do not fail randomly, which was fixed in
+        // https://github.com/openrndr/orx/commit/e8f50b3dd153ed82de121e9017cf42f6ea95ac8e
         val bounds = Rectangle(Vector2.ZERO, 640.0, 480.0)
+
+        // Create a 2D torus
         val outline = Shape(
             listOf(
                 Circle(bounds.center, 70.0).contour.reversed,
@@ -55,13 +61,12 @@ class TestCompositionIntersections {
 
         val radius = outline.bounds.dimensions.length / 2
         val off = outline.bounds.center
-    val num = radius.toInt()
 
-    @Test
-    fun `use a shape as a mask for line segments`() {
-        // Make sure intersections do not fail randomly, which was fixed in
-        // https://github.com/openrndr/orx/commit/e8f50b3dd153ed82de121e9017cf42f6ea95ac8e
-        val svg = List(50) {
+        val compositions = List(100) {
+            // Create compositions featuring horizontal lines
+            // visible inside the torus shape. Change the number of
+            // lines to make sure the calculations are not cached.
+            val num = radius.toInt() + it
             drawComposition {
                 lineSegments(List(num) { segNum ->
                     val yNorm = (segNum / (num - 1.0))
@@ -76,8 +81,8 @@ class TestCompositionIntersections {
             }
         }
 
-        val shapes = svg.last().findShapes()
-        val dimensions = svg.last().bounds.dimensions
+        val shapes = compositions.last().findShapes()
+        val dimensions = compositions.last().bounds.dimensions
 
         assertTrue(shapes.isNotEmpty(), "shapes should not be empty")
         assertTrue(shapes.first().shape.contours.isNotEmpty(), "contour should not be empty")