More elements migrated to typescript

test/utils/utils.test.ts

@@ -0,0 +1,50 @@
+import { determineOrderDir, rangeOf } from '../../src/utils/utils';
+
+describe('utils', () => {
+  describe('determineOrderDir', () => {
+    it('returns ASC when current order field and selected field are different', () => {
+      expect(determineOrderDir('foo', 'bar')).toEqual('ASC');
+      expect(determineOrderDir('bar', 'foo')).toEqual('ASC');
+    });
+
+    it('returns ASC when no current order dir is provided', () => {
+      expect(determineOrderDir('foo', 'foo')).toEqual('ASC');
+      expect(determineOrderDir('bar', 'bar')).toEqual('ASC');
+    });
+
+    it('returns DESC when current order field and selected field are equal and current order dir is ASC', () => {
+      expect(determineOrderDir('foo', 'foo', 'ASC')).toEqual('DESC');
+      expect(determineOrderDir('bar', 'bar', 'ASC')).toEqual('DESC');
+    });
+
+    it('returns undefined when current order field and selected field are equal and current order dir is DESC', () => {
+      expect(determineOrderDir('foo', 'foo', 'DESC')).toBeUndefined();
+      expect(determineOrderDir('bar', 'bar', 'DESC')).toBeUndefined();
+    });
+  });
+
+  describe('rangeOf', () => {
+    const func = (i) => `result_${i}`;
+    const size = 5;
+
+    it('builds a range of specified size invike provided function', () => {
+      expect(rangeOf(size, func)).toEqual([
+        'result_1',
+        'result_2',
+        'result_3',
+        'result_4',
+        'result_5',
+      ]);
+    });
+
+    it('builds a range starting at provided pos', () => {
+      const startAt = 3;
+
+      expect(rangeOf(size, func, startAt)).toEqual([
+        'result_3',
+        'result_4',
+        'result_5',
+      ]);
+    });
+  });
+});