Added tests for page

src/utils/page.test.js

@@ -0,0 +1,66 @@
+import {
+  getNextPageIndexLimited,
+  getNextPageIndexInfinte,
+  getPrevPageIndexLimited,
+  getPrevPageIndexInfinte
+} from './page.js';
+
+describe('getNextPageIndexLimited', () => {
+  it('returns next page index as expected', () => {
+    const testCases = [
+      { currentPageIndex: -5, pagesCount: 3, expected: 0 },
+      { currentPageIndex: 0, pagesCount: 3, expected: 1 },
+      { currentPageIndex: 1, pagesCount: 3, expected: 2 },
+      { currentPageIndex: 2, pagesCount: 3, expected: 2 },
+      { currentPageIndex: 7, pagesCount: 3, expected: 2 },
+    ]
+    testCases.forEach(({ currentPageIndex, pagesCount, expected }) => {
+      expect(getNextPageIndexLimited(currentPageIndex, pagesCount)).toBe(expected);
+    });
+  });
+});
+
+describe('getNextPageIndexInfinte', () => {
+  it('returns next page index as expected', () => {
+    const testCases = [
+      { currentPageIndex: -5, pagesCount: 3, expected: 1 },
+      { currentPageIndex: 0, pagesCount: 3, expected: 1 },
+      { currentPageIndex: 1, pagesCount: 3, expected: 2 },
+      { currentPageIndex: 2, pagesCount: 3, expected: 0 },
+      { currentPageIndex: 7, pagesCount: 3, expected: 0 },
+    ]
+    testCases.forEach(({ currentPageIndex, pagesCount, expected }) => {
+      expect(getNextPageIndexInfinte(currentPageIndex, pagesCount)).toBe(expected);
+    });
+  });
+});
+
+describe('getPrevPageIndexLimited', () => {
+  it('returns prev page index as expected', () => {
+    const testCases = [
+      { currentPageIndex: -5, pagesCount: 3, expected: 0 },
+      { currentPageIndex: 0, pagesCount: 3, expected: 0 },
+      { currentPageIndex: 1, pagesCount: 3, expected: 0 },
+      { currentPageIndex: 2, pagesCount: 3, expected: 1 },
+      { currentPageIndex: 7, pagesCount: 3, expected: 2 },
+    ]
+    testCases.forEach(({ currentPageIndex, pagesCount, expected }) => {
+      expect(getPrevPageIndexLimited(currentPageIndex, pagesCount)).toBe(expected);
+    });
+  });
+});
+
+describe('getPrevPageIndexInfinte', () => {
+  it('returns prev page index as expected', () => {
+    const testCases = [
+      { currentPageIndex: -5, pagesCount: 3, expected: 2 },
+      { currentPageIndex: 0, pagesCount: 3, expected: 2 },
+      { currentPageIndex: 1, pagesCount: 3, expected: 0 },
+      { currentPageIndex: 2, pagesCount: 3, expected: 1 },
+      { currentPageIndex: 7, pagesCount: 3, expected: 1 },
+    ]
+    testCases.forEach(({ currentPageIndex, pagesCount, expected }) => {
+      expect(getPrevPageIndexInfinte(currentPageIndex, pagesCount)).toBe(expected);
+    });
+  });
+});