Began adding signMsg unit test

test/unit/id-management-test.js

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+var assert = require('assert')
+var IdManagement = require('../../app/scripts/lib/id-management')
+var sinon = require('sinon')
+
+describe('IdManagement', function() {
+
+  beforeEach(function() {
+    // sinon allows stubbing methods that are easily verified
+    this.sinon = sinon.sandbox.create()
+    window.localStorage = {} // Hacking localStorage support into JSDom
+  })
+
+  afterEach(function() {
+    // sinon requires cleanup otherwise it will overwrite context
+    this.sinon.restore()
+  })
+
+  describe('#signMsg', function () {
+    const address = '0x926cD0393816429a580037475ec23eD65fDC893B'
+    const message = '0x0987654321abcdef'
+    const privateKey = '0xd291f7aa01b94941b446f260bca42c0752762571428ad4ed6239613c66365cf4'
+    const expectedResult = 'foo'
+
+    const idManagement = new IdManagement()
+    const exportKeyStub = sinon.stub(idManagement, 'exportPrivateKey', () => privateKey)
+
+    const result = idManagement.signMsg(address, message)
+    console.log(result)
+    assert.equal(result, expectedResult)
+  })
+})