Organize tests

test/browser/spec/ol/tileurlfunction.test.js

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+import TileGrid from '../../../../src/ol/tilegrid/TileGrid.js';
+import {
+  createFromTemplate,
+  createFromTemplates,
+  createFromTileUrlFunctions,
+  expandUrl,
+} from '../../../../src/ol/tileurlfunction.js';
+import {createXYZ} from '../../../../src/ol/tilegrid.js';
+
+describe('ol.TileUrlFunction', function () {
+  describe('expandUrl', function () {
+    describe('with number range', function () {
+      it('creates expected URLs', function () {
+        const template = 'http://tile-{1-3}/{z}/{x}/{y}';
+        const urls = expandUrl(template);
+        expect(urls).to.eql([
+          'http://tile-1/{z}/{x}/{y}',
+          'http://tile-2/{z}/{x}/{y}',
+          'http://tile-3/{z}/{x}/{y}',
+        ]);
+      });
+      it('creates expected URLs', function () {
+        const template = 'http://tile-{9-11}/{z}/{x}/{y}';
+        const urls = expandUrl(template);
+        expect(urls).to.eql([
+          'http://tile-9/{z}/{x}/{y}',
+          'http://tile-10/{z}/{x}/{y}',
+          'http://tile-11/{z}/{x}/{y}',
+        ]);
+      });
+    });
+    describe('with character range', function () {
+      it('creates expected URLs', function () {
+        const template = 'http://tile-{c-e}/{z}/{x}/{y}';
+        const urls = expandUrl(template);
+        expect(urls).to.eql([
+          'http://tile-c/{z}/{x}/{y}',
+          'http://tile-d/{z}/{x}/{y}',
+          'http://tile-e/{z}/{x}/{y}',
+        ]);
+      });
+    });
+    describe('without range', function () {
+      it('creates expected URLs', function () {
+        const template = 'http://tiles.example.com/{z}/{x}/{y}';
+        const urls = expandUrl(template);
+        expect(urls).to.eql(['http://tiles.example.com/{z}/{x}/{y}']);
+      });
+    });
+  });
+
+  describe('createFromTemplate', function () {
+    const tileGrid = createXYZ();
+    it('creates expected URL', function () {
+      const tileUrl = createFromTemplate('{z}/{x}/{y}', tileGrid);
+      expect(tileUrl([3, 2, 1])).to.eql('3/2/1');
+      expect(tileUrl(null)).to.be(undefined);
+    });
+    it('accepts {-y} placeholder', function () {
+      const tileUrl = createFromTemplate('{z}/{x}/{-y}', tileGrid);
+      expect(tileUrl([3, 2, 2])).to.eql('3/2/5');
+    });
+    it('returns correct value for {-y} with custom tile grids', function () {
+      const customTileGrid = new TileGrid({
+        extent: [-180, -90, 180, 90],
+        origin: [-180, -90],
+        resolutions: [360 / 256, 360 / 512, 360 / 1024, 360 / 2048],
+      });
+      const tileUrl = createFromTemplate('{z}/{x}/{-y}', customTileGrid);
+      expect(tileUrl([3, 2, 2])).to.eql('3/2/1');
+    });
+    it('replaces multiple placeholder occurrences', function () {
+      const tileUrl = createFromTemplate('{z}/{z}{x}{y}', tileGrid);
+      expect(tileUrl([3, 2, 1])).to.eql('3/321');
+    });
+  });
+
+  describe('createFromTemplates', function () {
+    const tileGrid = createXYZ();
+    it('creates expected URL', function () {
+      const templates = ['http://tile-1/{z}/{x}/{y}'];
+      const tileUrlFunction = createFromTemplates(templates, tileGrid);
+      const tileCoord = [3, 2, 1];
+
+      expect(tileUrlFunction(tileCoord)).to.eql('http://tile-1/3/2/1');
+    });
+  });
+
+  describe('createFromTileUrlFunctions', function () {
+    const tileGrid = createXYZ();
+    it('creates expected URL', function () {
+      const tileUrl = createFromTileUrlFunctions([
+        createFromTemplate('a', tileGrid),
+        createFromTemplate('b', tileGrid),
+      ]);
+      const tileUrl1 = tileUrl([1, 0, 0]);
+      const tileUrl2 = tileUrl([1, 0, 1]);
+      expect(tileUrl1).not.to.be(tileUrl2);
+      expect(tileUrl(null)).to.be(undefined);
+    });
+  });
+});