Vk add math steps

example/features/sample.feature

@@ -40,3 +40,7 @@ Feature: Cucumber test
   Scenario: I want to test all the form method
     Then user prints the message 'other testssttst' to console
 # Given user navigates to '${vars.base_url}'
+
+  @full_test
+  Scenario: I want to test math execute
+    Given user execute math(1+1)

package.json

@@ -36,6 +36,7 @@
     "cucumber-html-reporter": "^5.0.0",
     "fs-plus": "^3.1.1",
     "jsonpath": "^1.0.1",
+    "mathjs": "^6.2.2",
     "protractor": "^5.4.2",
     "protractor-cucumber": "^0.1.8",
     "protractor-cucumber-framework": "^1.0.2",

src/step_defs/common.js

@@ -6,6 +6,8 @@ const {
 } = helpers;
 const path = require('path');
 
+const { compile } = require('../support/helpers/math');
+
 /**
  * Sleeps the execution for a specific time in seconds
  */
@@ -89,3 +91,9 @@ Then(/^user saves a screenshot '(.*)'$/, (screenshotPath) => {
     vars.addVariable('img_num', imgNum += 1);
   }
 });
+
+Given(/^user execute math\((.*)\)/, (exp) => {
+  const result = compile(exp);
+  logger.info(result);
+  return result;
+});

src/support/helpers/math.js

@@ -0,0 +1,7 @@
+const math = require('mathjs');
+
+const compile = (expression = '') => math.evaluate(expression);
+
+module.exports = {
+  compile,
+};

test/support/helper/math.test.js

@@ -0,0 +1,26 @@
+const { compile } = require('../../../src/support/helpers/math');
+
+describe('Helper Math - exp', () => {
+  it('should return correctly result from given expression', () => {
+    const expression = '1+2*4';
+    const result = compile(expression);
+    expect(result).toEqual(9);
+  });
+
+  it('should return correctly result from given expression with variables', () => {
+    const item = 2;
+    const expression = `1+2*4/${item}`;
+    const result = compile(expression);
+    expect(result).toEqual(5);
+  });
+
+  it('should throw error in undefined variables or symbols', () => {
+    const item = 'a';
+    const expression = `1+2*4/${item}`;
+    try {
+      compile(expression);
+    } catch (error) {
+      expect(error.message).toEqual('Undefined symbol a');
+    }
+  });
+});