fix: invalid Date object will throw a TypeError (#58) (#59)

* fix: Invalid Date object will throw a TypeError (#58)

* fixed lint error: unnecessary 'else' after 'return'

lib/date.js

@@ -1,8 +1,14 @@
 import { truncate } from './helpers'
 
 export default function inspectDate(dateObject, options) {
-  // If we need to - truncate the time portion, but never the date
-  const split = dateObject.toJSON().split('T')
+  const stringRepresentation = dateObject.toJSON()
+
+  if (stringRepresentation === null) {
+    return 'Invalid Date'
+  }
+
+  const split = stringRepresentation.split('T')
   const date = split[0]
+  // If we need to - truncate the time portion, but never the date
   return options.stylize(`${date}T${truncate(split[1], options.truncate - date.length - 1)}`, 'date')
 }

test/dates.js

@@ -5,6 +5,11 @@ describe('date', () => {
     expect(inspect(new Date(1475318637123))).to.equal('2016-10-01T10:43:57.123Z')
   })
 
+  it('returns "Invalid Date" if given an invalid Date object', () => {
+    // See: https://github.com/chaijs/loupe/issues/58
+    expect(inspect(new Date('not a date'))).to.equal('Invalid Date')
+  })
+
   describe('colors', () => {
     it('returns date with red color, if colour is set to true', () => {
       expect(inspect(new Date(1475318637123), { colors: true })).to.equal(