Jest (#792)

__tests__/server/utils.js

@@ -0,0 +1,58 @@
+const assert = require('assert')
+const utils = require('../../src/server/utils')
+
+describe('utils', () => {
+  describe('getPage', () => {
+    const array = [1, 2, 3, 4, 5]
+    const perPage = 2
+
+    test('should return first page', () => {
+      assert.deepEqual(utils.getPage(array, 1, perPage), {
+        items: [1, 2],
+        current: 1,
+        first: 1,
+        next: 2,
+        last: 3
+      })
+    })
+
+    test('should return second page', () => {
+      assert.deepEqual(utils.getPage(array, 2, perPage), {
+        items: [3, 4],
+        current: 2,
+        first: 1,
+        prev: 1,
+        next: 3,
+        last: 3
+      })
+    })
+
+    test('should return third page (last)', () => {
+      assert.deepEqual(utils.getPage(array, 3, perPage), {
+        items: [5],
+        current: 3,
+        first: 1,
+        prev: 2,
+        last: 3
+      })
+    })
+
+    test('should return an empty array if page is greater than the last page', () => {
+      assert.deepEqual(utils.getPage(array, 99, perPage), {
+        items: []
+      })
+    })
+
+    test('should return the array if perPage is greater than the array size', () => {
+      assert.deepEqual(utils.getPage(array, 1, 99), {
+        items: array
+      })
+    })
+
+    test('should return an empty array if the array is empty', () => {
+      assert.deepEqual(utils.getPage([], 1, 1), {
+        items: []
+      })
+    })
+  })
+})