jest-mock-random - npm Package Compare versions

Comparing version 1.0.1 to 1.0.2

__tests__/mockRandomWith.spec.js

@@ -1,7 +0,12 @@
-const mockRandomWith = require('../index');
+const {
+  mockRandomForEach,
+  mockRandom,
+  resetMockRandom,
+} = require('../index');
 
-describe('mockRandomWith', () => {
-  mockRandomWith([0.1, 0.2, 0.3]);
+afterEach(() => jest.restoreAllMocks()); // avoid mock by spy too leak between test
+describe('mockRandomForEach', () => {
+  mockRandomForEach([0.1, 0.2, 0.3]);
   describe('Array of values', () => {
-    mockRandomWith([0.1, 0.2, 0.3]);
+    mockRandomForEach([0.1, 0.2, 0.3]);
     it('mocks the Math random calls with the given array', () => {
@@ -26,3 +31,3 @@ const actual = [...new Array(3)].map(() => Math.random());
   describe('Corner case', () => {
-    mockRandomWith([]);
+    mockRandomForEach([]);
     it('throw Error in case we pass an empty array', () => {
@@ -35,3 +40,3 @@ const actual = () => Math.random();
   describe('Singular value', () => {
-    mockRandomWith(0.1);
+    mockRandomForEach(0.1);
     it('returns always the same value in case of passing a singular integer', () => {
@@ -51,3 +56,3 @@ const actual = [...new Array(3)].map(() => Math.random());
   describe('Invalid types warning with single value', () => {
-    mockRandomWith(45);
+    mockRandomForEach(45);
     it('logs a warning if the singular value passed is not a decimal', () => {
@@ -61,4 +66,14 @@ const spy = jest.spyOn(global.console, 'warn');
   });
+  describe('Value 0', () => {
+    mockRandomForEach(0);
+    it('does not logs a warning if the value is 0', () => {
+      const spy = jest.spyOn(global.console, 'warn');
+
+      Math.random();
+
+      expect(spy).not.toBeCalled();
+    });
+  });
   describe('Invalid types warning with array of values', () => {
-    mockRandomWith([1, 0.5, 'a']);
+    mockRandomForEach([1, 0.5, 'a']);
     it('logs a warning if any value of the passed array is not a decimal', () => {
@@ -74,3 +89,3 @@ const spy = jest.spyOn(global.console, 'warn');
     let b;
-    mockRandomWith(0.2);
+    mockRandomForEach(0.2);
     beforeAll(() => { b = [1]; });
@@ -83,2 +98,27 @@ it('allows other calls to beforeAll', () => {
   });
+  describe('Individual test mock random', () => {
+    afterEach(() => resetMockRandom());
+    it('mock random for a particular test', () => {
+      mockRandom([0, 0.1, 0.2]);
+
+      const actual = [...new Array(3)].map(() => Math.random());
+
+      expect(actual).toEqual([0, 0.1, 0.2]);
+    });
+    it('mocks individually each test where is declared', () => {
+      mockRandom(0.2);
+
+      const actual = [...new Array(3)].map(() => Math.random());
+
+      expect(actual).toEqual([0.2, 0.2, 0.2]);
+    });
+    it('resets the mock on resetMockRandom', () => {
+      mockRandom(0.2);
+
+      resetMockRandom();
+      const actual = [...new Array(3)].map(() => Math.random());
+
+      expect(actual).not.toEqual([0.2, 0.2, 0.2]);
+    });
+  });
 });

index.js

 // Warning in case the passed value is not a decimal
 // eslint-disable-next-line no-console
 const showWarning = () => console.warn('WARNING: The value that you are using to mock random is not a decimal and it is breaking the real contract');
-const isDecimal = number => !Number.isNaN(number) && number % 1 !== 0;
+const isDecimal = number => number === 0 || (!Number.isNaN(number) && number % 1 !== 0);
 const warnBrokenContract = (values) => {
@@ -13,3 +13,3 @@ if (!values.map(parseFloat).every(isDecimal)) {
 const mathCopy = Object.create(global.Math);
-const resetMathRandom = () => {
+const resetMockRandom = () => {
   global.Math = mathCopy;
@@ -39,3 +39,3 @@ };
 // Through a copy of the global Math object we mock the random method
-const createMathRandomMock = (values) => {
+const mockRandom = (values) => {
   const mockMath = Object.create(global.Math);
@@ -47,10 +47,10 @@ mockMath.random = randomMock(values);
 // When mockRandomWith is called it create the mock beforeEach and reset it after
-const mockRandomWith = (valuesArray) => {
+const mockRandomForEach = (valuesArray) => {
   // eslint-disable-next-line no-undef
   beforeEach(() => {
-    createMathRandomMock(valuesArray);
+    mockRandom(valuesArray);
   });
   // eslint-disable-next-line no-undef
   afterEach(() => {
-    resetMathRandom();
+    resetMockRandom();
   });
@@ -60,2 +60,6 @@ };
 
-module.exports = mockRandomWith;
+module.exports = {
+  mockRandomForEach,
+  mockRandom,
+  resetMockRandom,
+};

package.json

 {
   "name": "jest-mock-random",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Math.random() as a deterministic jest mock function",
@@ -5,0 +5,0 @@ "main": "index.js",

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Improved metrics

Total package byte prevSize

136739

increased by0.87%

Lines of code

175

increased by25.9%

No dependency changes