Add groups to test suite

test/day2.test.js

@@ -2,45 +2,53 @@ import {expect} from 'chai';
 import day2 from '../src/day2';
 
 describe('day2 tests', () => {
-    it('should return undefined when no parameters are passed', () => {
-        expect(day2()).to.be.undefined;
-    });
+    describe('check data type', () => {
+        it('should return undefined when no parameters are passed', () => {
+            expect(day2()).to.be.undefined;
+        });
 
-    it('should return a string when a string is passed', () => {
-        expect(day2('a string')).to.be.a('string');
-    });
+        it('should return a string when a string is passed', () => {
+            expect(day2('a string')).to.be.a('string');
+        });
 
-    it('should return a number when a number is passed', () => {
-        expect(day2(10)).to.be.a('Number');
-    });
+        it('should return a number when a number is passed', () => {
+            expect(day2(10)).to.be.a('Number');
+        });
 
-    it('should not be a string when a number is passed', () => {
-        expect(day2(10)).to.not.be.a('string');
+        it('should not be a string when a number is passed', () => {
+            expect(day2(10)).to.not.be.a('string');
+        });
     });
 
-    it('should equal the string passed', () => {
-        expect(day2('same string')).to.equal('same string');
-    });
+    describe('checking equals', () => {
+        it('should equal the string passed', () => {
+            expect(day2('same string')).to.equal('same string');
+        });
 
-    it('should deep equal the object passed', () => {
-        const givenObject = {
-            hello: 'world'
-        };
+        it('should deep equal the object passed', () => {
+            const givenObject = {
+                hello: 'world'
+            };
 
-        expect(day2(givenObject)).to.deep.equal(givenObject);
+            expect(day2(givenObject)).to.deep.equal(givenObject);
+        });
     });
 
-    it('should contain part of the string passed', () => {
-        const givenString = 'hello world';
+    describe('checking contains', () => {
+        it('should contain part of the string passed', () => {
+            const givenString = 'hello world';
 
-        expect(day2(givenString)).to.contain('world');
+            expect(day2(givenString)).to.contain('world');
+        });
     });
 
-    it('should throw an error when "error" is passed', () => {
-        function wrappedFunction() {
-            day2('error');
-        }
+    describe('checking errors', () => {
+        it('should throw an error when "error" is passed', () => {
+            function wrappedFunction() {
+                day2('error');
+            }
 
-        expect(wrappedFunction).to.throw('Cannot pass error');
+            expect(wrappedFunction).to.throw('Cannot pass error');
+        });
     });
 });