adding initial mocha tests

package.json

@@ -5,7 +5,7 @@
   "main": "moment-feiertage.js",
   "homepage": "https://github.com/DaniSchenk/moment-feiertage",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "mocha"
   },
   "repository": {
     "type": "git",
@@ -32,5 +32,8 @@
   "license": "ISC",
   "dependencies": {
     "moment": "^2.15.1"
+  },
+  "devDependencies": {
+    "mocha": "^5.2.0"
   }
 }

test.js

@@ -0,0 +1,64 @@
+const assert = require('assert');
+const moment = require('moment');
+const {
+  isHoliday
+} = require('./moment-feiertage');
+
+const allStates = ['BW', 'BY', 'BE', 'BB', 'HB', 'HH', 'HE', 'MV', 'NI', 'NW', 'RP', 'SL', 'SN', 'ST', 'SH', 'TH'];
+// test some non-holiday dates
+it('should return false', () => {
+  assert.equal(false, moment('2017-01-03').isHoliday());
+  assert.deepEqual({
+    allStates: false,
+    holidayName: '',
+    holidayStates: [],
+    testedStates: allStates
+  }, moment('2017-01-03').isHoliday([]));
+
+  for(const s of allStates) {
+    assert.equal(false, moment('2017-01-03').isHoliday(s));
+    assert.deepEqual({
+      allStates: false,
+      holidayName: '',
+      holidayStates: [],
+      testedStates: [s]
+    }, moment('2017-01-03').isHoliday([s]));
+  }
+});
+// test Christmas
+it('should return Christmas', () => {
+  assert.equal('1. Weihnachtsfeiertag', moment('2019-12-25').isHoliday());
+  assert.deepEqual({
+    allStates: true,
+    holidayName: '1. Weihnachtsfeiertag',
+    holidayStates: allStates,
+    testedStates: allStates
+  }, moment('2019-12-25').isHoliday([]));
+
+  for(const s of allStates) {
+    assert.equal('1. Weihnachtsfeiertag', moment('2019-12-25').isHoliday(s));
+    assert.deepEqual({
+      allStates: true,
+      holidayName: '1. Weihnachtsfeiertag',
+      holidayStates: [s],
+      testedStates: [s]
+    }, moment('2019-12-25').isHoliday([s]));
+  }
+});
+
+// test Christmas
+it('should return correct Object', () => {
+  assert.deepEqual({
+    allStates: false,
+    holidayName: 'Allerheiligen',
+    holidayStates: [ 'BW', 'BY', 'NW', 'RP', 'SL' ],
+    testedStates: allStates
+  }, moment('2018-11-01').isHoliday([]));
+
+  assert.deepEqual({
+    allStates: false,
+    holidayName: 'Allerheiligen',
+    holidayStates: [ 'BW' ],
+    testedStates: ['BW', 'SH', 'TH']
+  }, moment('2018-11-01').isHoliday(['BW', 'SH', 'TH']));
+});