Use Cypress so tests run & pass in a real browser

.gitignore

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-build/
-
 ### Node ###
 
 # Logs

.travis.yml

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 language: node_js
 # default is apparently 0.10.48 for some reason O.O
-node_js: '8.9'
+node_js: '10.16.0'
+
+# cache folder with Cypress binary (https://docs.cypress.io/guides/guides/continuous-integration.html#Travis)
+cache:
+  directories:
+    - ~/.cache

cypress.json

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+{
+  "video": false,
+  "modifyObstructiveCode": false
+}

cypress/integration/browserify.spec.js

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+const Physijs = require('../../browserify.js')
+
+describe('browserify', () => {
+  it('should create a scene', () => {
+    const scene = new Physijs.Scene()
+    expect(scene.type).to.eq('Scene')
+  })
+})

cypress/integration/webpack.spec.js

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+const Physijs = require('../../webpack.js')
+
+describe('webpack', () => {
+  it('should create a scene', () => {
+    const scene = new Physijs.Scene()
+    expect(scene.type).to.eq('Scene')
+  })
+})

cypress/plugins/index.js

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+const browserify = require('@cypress/browserify-preprocessor')
+const webpack = require('@cypress/webpack-preprocessor')
+
+const ammoPath = require.resolve('../../physijs/vendor/ammo.js')
+
+const bProcess = browserify({
+  browserifyOptions: {
+    // don't parse ammo
+    noParse: [ammoPath],
+    // override the preprocessor default (which runs babelify)
+    transform: []
+  }
+})
+
+const wProcess = webpack({
+  webpackOptions: {
+    // fast builds, build is only used for testing purposes
+    mode: 'development',
+    // don't parse ammo
+    module: {
+      noParse: ammoPath,
+    }
+  }
+})
+
+module.exports = (on) => {
+  // process webpack test w/ webpack and browserify test w/ browserify
+  on('file:preprocessor', (file) => {
+    if (file.filePath.includes('webpack.spec.js')) {
+      return wProcess(file)
+    }
+    return bProcess(file)
+  })
+}

cypress/support/index.js

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+require('./commands')
+
+// nothing to screenshot here
+Cypress.Screenshot.defaults({
+  screenshotOnRunFailure: false
+})