add unit test files

test/unit/browser.spec.js

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+import Browser from '../../src/js/browser'
+
+describe('Browser', () => {
+  it('has a function named isFirefox that returns a boolean value', () => {
+    expect(typeof Browser.isFirefox).toBe('function')
+    expect(typeof Browser.isFirefox()).toBe('boolean')
+  })
+
+  it('has a function named isIE that returns a boolean value', () => {
+    expect(typeof Browser.isIE).toBe('function')
+    expect(typeof Browser.isIE()).toBe('boolean')
+  })
+
+  it('has a function named isEdge that returns a boolean value', () => {
+    expect(typeof Browser.isEdge).toBe('function')
+    expect(typeof Browser.isEdge()).toBe('boolean')
+  })
+
+  it('has a function named isChrome that returns a boolean value', () => {
+    expect(typeof Browser.isChrome).toBe('function')
+    expect(typeof Browser.isChrome()).toBe('boolean')
+  })
+
+  it('has a function named isSafari that returns a boolean value', () => {
+    expect(typeof Browser.isSafari).toBe('function')
+    expect(typeof Browser.isSafari()).toBe('boolean')
+  })
+})

test/unit/functions.spec.js

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+import { addWrapper, capitalizePrint } from '../../src/js/functions'
+
+describe('addWrapper()', () => {
+  it('add a div wrapper to a raw html', () => {
+    const params = {
+      font: 'TimesNewRoman',
+      font_size: '12px'
+    }
+    expect(addWrapper('<span>Test</span>', params)).toBe('<div style="font-family:' + params.font + ' !important; font-size: ' + params.font_size + ' !important; width:100%;"><span>Test</span></div>')
+  })
+})
+
+describe('capitalizePrint()', () => {
+  it('should capitalize the first letter of a string', () => {
+    expect(capitalizePrint('test')).toBe('Test')
+  })
+})

test/unit/html.spec.js

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+import Html from '../../src/js/html'
+
+describe('Html', () => {
+  it('has a method named print', () => {
+    expect(typeof Html.print).toBe('function')
+  })
+})

test/unit/image.spec.js

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+import Image from '../../src/js/image'
+
+describe('Image', () => {
+  it('has a method named print', () => {
+    expect(typeof Image.print).toBe('function')
+  })
+})

test/unit/json.spec.js

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+import Json from '../../src/js/json'
+
+describe('Json', () => {
+  it('has a method named print', () => {
+    expect(typeof Json.print).toBe('function')
+  })
+})

test/unit/modal.spec.js

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+import Modal from '../../src/js/modal'
+
+describe('Modal', () => {
+  it('has a method named show', () => {
+    expect(typeof Modal.show).toBe('function')
+  })
+
+  it('has a method named close', () => {
+    expect(typeof Modal.close).toBe('function')
+  })
+})

test/unit/pdf.spec.js

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+import Pdf from '../../src/js/pdf'
+
+describe('Pdf', () => {
+  it('has a method named print', () => {
+    expect(typeof Pdf.print).toBe('function')
+  })
+})

test/unit/print.spec.js

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+import Print from '../../src/js/print'
+
+describe('Print', () => {
+  it('has a method named send', () => {
+    expect(typeof Print.send).toBe('function')
+  })
+})