Update pagination (#346)

test/server/utils.js

@@ -21,4 +21,76 @@ describe('utils', function () {
       assert.strictEqual(utils.toNative(true), true)
     })
   })
+
+  describe('getPage', function () {
+    var array = [1, 2, 3, 4, 5]
+    var perPage = 2
+
+    it('should return first page', function () {
+      assert.deepEqual(
+        utils.getPage(array, 1, perPage),
+        {
+          items: [1, 2],
+          current: 1,
+          first: 1,
+          next: 2,
+          last: 3
+        }
+      )
+    })
+
+    it('should return second page', function () {
+      assert.deepEqual(
+        utils.getPage(array, 2, perPage),
+        {
+          items: [3, 4],
+          current: 2,
+          first: 1,
+          prev: 1,
+          next: 3,
+          last: 3
+        }
+      )
+    })
+
+    it('should return third page (last)', function () {
+      assert.deepEqual(
+        utils.getPage(array, 3, perPage),
+        {
+          items: [5],
+          current: 3,
+          first: 1,
+          prev: 2,
+          last: 3
+        }
+      )
+    })
+
+    it('should return an empty array if page is greater than the last page', function () {
+      assert.deepEqual(
+        utils.getPage(array, 99, perPage),
+        {
+          items: []
+        }
+      )
+    })
+
+    it('should return the array if perPage is greater than the array size', function () {
+      assert.deepEqual(
+        utils.getPage(array, 1, 99),
+        {
+          items: array
+        }
+      )
+    })
+
+    it('should return an empty array if the array is empty', function () {
+      assert.deepEqual(
+        utils.getPage([], 1, 1),
+        {
+          items: []
+        }
+      )
+    })
+  })
 })