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bloglist_backend/tests/list_helper.test.js

+const listHelper = require('../utils/list_helper')
+
+//dummy-testi, palauttaa aina 1 ja saa parametriksi blogilistan
+describe('dummy', () => {
+    test('dummy returns one', () => {
+        const blogs = []
+    
+        const result = listHelper.dummy(blogs)
+        expect(result).toBe(1)
+    })
+})
+
+describe('total likes', () => {
+    //testi tyhjälle listalle, palauttaa nollan
+    test('of empty list is zero', () => {
+        const emptyList = []
+        const result = listHelper.totalLikes(emptyList)
+        expect(result).toBe(0)
+      })
+      
+    //testi listalle, jossa yksi blogi, palauttaa kyseisen tykkäysmäärän
+    test('when list has only one blog equals the likes of that', () => {
+        const listWithOneBlog = [
+            {
+              _id: '5a422aa71b54a676234d17f8',
+              title: 'Go To Statement Considered Harmful',
+              author: 'Edsger W. Dijkstra',
+              url: 'http://www.u.arizona.edu/~rubinson/copyright_violations/Go_To_Considered_Harmful.html',
+              likes: 5,
+              __v: 0
+            }
+          ]
+
+      const result = listHelper.totalLikes(listWithOneBlog)
+      expect(result).toBe(5)
+    })
+
+    //testi isolle listalle, palauttaa tykkäysten summan
+    test('of a bigger list is calculated right', () => {
+        const bigList = [
+            {
+                _id: "5a422a851b54a676234d17f7",
+                title: "React patterns",
+                author: "Michael Chan",
+                url: "https://reactpatterns.com/",
+                likes: 7,
+                __v: 0
+              },
+              {
+                _id: "5a422aa71b54a676234d17f8",
+                title: "Go To Statement Considered Harmful",
+                author: "Edsger W. Dijkstra",
+                url: "http://www.u.arizona.edu/~rubinson/copyright_violations/Go_To_Considered_Harmful.html",
+                likes: 5,
+                __v: 0
+              },
+              {
+                _id: "5a422b3a1b54a676234d17f9",
+                title: "Canonical string reduction",
+                author: "Edsger W. Dijkstra",
+                url: "http://www.cs.utexas.edu/~EWD/transcriptions/EWD08xx/EWD808.html",
+                likes: 12,
+                __v: 0
+              },
+              {
+                _id: "5a422b891b54a676234d17fa",
+                title: "First class tests",
+                author: "Robert C. Martin",
+                url: "http://blog.cleancoder.com/uncle-bob/2017/05/05/TestDefinitions.htmll",
+                likes: 10,
+                __v: 0
+              },
+              {
+                _id: "5a422ba71b54a676234d17fb",
+                title: "TDD harms architecture",
+                author: "Robert C. Martin",
+                url: "http://blog.cleancoder.com/uncle-bob/2017/03/03/TDD-Harms-Architecture.html",
+                likes: 0,
+                __v: 0
+              },
+              {
+                _id: "5a422bc61b54a676234d17fc",
+                title: "Type wars",
+                author: "Robert C. Martin",
+                url: "http://blog.cleancoder.com/uncle-bob/2016/05/01/TypeWars.html",
+                likes: 2,
+                __v: 0
+              }  
+        ]
+
+        const result = listHelper.totalLikes(bigList)
+        expect(result).toBe(36)
+      })
+  })
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