From 0bdb14cbf3531adba94c25c4de3cdcc059eab814 Mon Sep 17 00:00:00 2001
From: Vadim <korobeinikovv@mail.ru>
Date: Wed, 27 Jan 2021 21:17:40 +0300
Subject: [PATCH] Added tests for page

---
 src/utils/page.test.js | 66 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 src/utils/page.test.js

diff --git a/src/utils/page.test.js b/src/utils/page.test.js
new file mode 100644
index 0000000..f491a2d
--- /dev/null
+++ b/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);
+    });
+  });
+});