added a test

test-browser/commands/sendLowLevelTx.js

+const EventEmitter = require('events')
+class sendLowLevelTx extends EventEmitter {
+  command (address, value, callData, callback) {
+    this.api.perform((client, done) => {
+      this.api.execute(function (value) {
+        document.getElementById('deployAndRunLLTxSendTransaction').click
+        done()
+        if (callback) {
+          callback.call(this.api)
+        }
+        this.emit('complete')
+      })
+    })
+    return this
+  }
+}
+
+module.exports = sendLowLevelTx

test-browser/tests/specialFunctions.js

+'use strict'
+var init = require('../helpers/init')
+var sauce = require('./sauce')
+
+module.exports = {
+  before: function (browser, done) {
+    init(browser, done)
+  },
+  '@sources': function () {
+    return sources
+  },
+  'Use special functions receive/fullback': function (browser) {
+    browser.waitForElementVisible('#icon-panel', 10000)
+    .testContracts('receiveAndfFallback.sol', sources[0]['browser/Untitled.sol'], ['CheckSpecials'])
+    .clickLaunchIcon('udapp'
+      .selectContract('CheckSpecials')
+      .createContract('')
+      .clickInstance(0)
+      .perform((done) => {
+        browser.getAddressAtPosition(0, (address) => {
+          browser.sendLowLevelTx(address, '0', '0xaa')
+          .journalLastChild('dd')
+          .waitForElementVisible('label[id="deployAndRunLLTxError"]')
+          .assert.containsText('label[id="deployAndRunLLTxError"]', '')
+          .perform(done)
+        })
+      })
+    )
+  },
+  tearDown: sauce
+}
+
+var sources = [
+  {
+    'browser/receiveAndfFallback.sol': {
+      content: `
+        contract CheckSpecials {
+          receive() payable external{}
+          fallback() external {}
+        }
+      `
+    },
+    'browser/receiveOnly.sol': {
+      content: `
+        contract CheckSpecials {
+          receive() payable external{}
+        }
+      `
+    },
+    'browser/fallbackOnly.sol': {
+      content: `
+        contract CheckSpecials {
+          fallback() payable external{}
+        }
+      `
+    }
+  }
+]