add test suite

src/__swaps__/screens/Swap/__tests__/NiceIncrementerFormatter.test.ts

@@ -0,0 +1,40 @@
+import { niceIncrementFormatter } from '@/__swaps__/utils/swaps';
+import { SLIDER_WIDTH } from '../constants';
+
+type TestCase = {
+  incrementDecimalPlaces: number;
+  inputAssetBalance: number | string;
+  inputAssetUsdPrice: number;
+  niceIncrement: number | string;
+  percentageToSwap: number;
+  sliderXPosition: number;
+  stripSeparators?: boolean;
+  isStablecoin?: boolean;
+} & {
+  testName: string;
+  expectedResult: string;
+};
+
+const TEST_CASES: TestCase[] = [
+  {
+    incrementDecimalPlaces: 0,
+    inputAssetBalance: 45.47364224817269,
+    inputAssetUsdPrice: 0.9995363790000001,
+    niceIncrement: '1',
+    percentageToSwap: 0.5,
+    sliderXPosition: SLIDER_WIDTH / 2,
+    stripSeparators: true,
+    isStablecoin: true,
+    testName: 'DAI Stablecoin',
+    expectedResult: '22.74',
+  },
+];
+
+describe('NiceIncremenetFormatter', () => {
+  TEST_CASES.forEach(({ testName, expectedResult, ...params }, index) => {
+    // eslint-disable-next-line jest/valid-title
+    test(testName || `test-${index}`, () => {
+      expect(niceIncrementFormatter({ ...params })).toBe(expectedResult);
+    });
+  });
+});