Add node tests

test/node/ol/geom/flat/straightchunk.test.js

@@ -0,0 +1,70 @@
+import expect from '../../../expect.js';
+import {matchingChunk} from '../../../../../src/ol/geom/flat/straightchunk.js';
+
+describe('ol/geom/flat/straightchunk.js', function () {
+  describe('matchingChunk', function () {
+    describe('single segment with stride == 3', function () {
+      const flatCoords = [0, 0, 42, 1, 1, 42];
+      const stride = 3;
+
+      it('returns whole line with angle delta', function () {
+        const got = matchingChunk(Math.PI / 4, flatCoords, 0, 6, stride);
+        expect(got).to.eql([0, 6]);
+      });
+
+      it('returns whole line with zero angle delta', function () {
+        const got = matchingChunk(0, flatCoords, 0, 6, stride);
+        expect(got).to.eql([0, 6]);
+      });
+    });
+
+    describe('short line string', function () {
+      const flatCoords = [0, 0, 1, 0, 1, 1, 0, 1];
+      const stride = 2;
+
+      it('returns whole line if straight enough', function () {
+        const got = matchingChunk(Math.PI, flatCoords, 0, 8, stride);
+        expect(got).to.eql([0, 8]);
+      });
+
+      it('returns first matching chunk if all chunk lengths are the same', function () {
+        const got = matchingChunk(Math.PI / 4, flatCoords, 0, 8, stride);
+        expect(got).to.eql([0, 4]);
+      });
+    });
+
+    describe('longer line string', function () {
+      const flatCoords = [
+        0,
+        0,
+        1,
+        0,
+        1,
+        1,
+        0,
+        1,
+        0,
+        -1,
+        -1,
+        -1,
+        -1,
+        0,
+        -1,
+        2,
+        -2,
+        4,
+      ];
+      const stride = 2;
+
+      it('returns stright chunk from within the linestring', function () {
+        const got = matchingChunk(0, flatCoords, 0, 18, stride);
+        expect(got).to.eql([10, 16]);
+      });
+
+      it('returns long chunk at the end if angle and length within threshold', function () {
+        const got = matchingChunk(Math.PI / 4, flatCoords, 0, 18, stride);
+        expect(got).to.eql([10, 18]);
+      });
+    });
+  });
+});