Add Decade tests

index.js

@@ -2,6 +2,7 @@
 
 const ExtDate = require('./src/date')
 const Year = require('./src/year')
+const Decade = require('./src/decade')
 const Season = require('./src/season')
 const Bitmask = require('./src/bitmask')
 const types = require('./src/types')
@@ -21,6 +22,7 @@ function edtf(...args) {
 module.exports = Object.assign(edtf, {
   Date: ExtDate,
   Year,
+  Decade,
   Season,
   Bitmask,
   parse,

src/decade.js

@@ -18,6 +18,9 @@ class Decade {
   constructor(input) {
     V[this] = []
 
+    this.uncertain = 0
+    this.approximate = 0
+
     switch (typeof input) {
     case 'number':
       this.decade = input
@@ -104,17 +107,15 @@ class Decade {
   }
 
   toEDTF() {
-    let values = this.values.map(Decade.pad)
+    let decade = Decade.pad(this.decade)
 
     if (this.uncertain.value)
-      values = this.uncertain.marks(values, '?')
+      decade = decade + '?'
 
-    if (this.approximate.value) {
-      values = this.approximate.marks(values, '~')
-        .map(value => value.replace(/~\?/, '%'))
-    }
+    if (this.approximate.value)
+      decade = (decade + '~').replace(/\?~/, '%')
 
-    return values[0]
+    return decade
   }
 
   static pad(number) {

test/decade.js

@@ -0,0 +1,26 @@
+'use strict'
+
+const { Decade } = require('..')
+
+describe('Decade', () => {
+
+  describe('.edtf', () => {
+    it('default', () =>
+      expect(new Decade().edtf).to.match(/^\d\d\d$/))
+
+    it('DDD', () => {
+      expect(new Decade([198]).edtf).to.eql('198')
+      expect(new Decade(99).edtf).to.eql('099')
+    })
+
+    it('-DDD', () => {
+      expect(new Decade(-9).edtf).to.eql('-009')
+    })
+
+    it('DDD~', () => {
+      expect(new Decade({ values: [198], approximate: true }).edtf)
+        .to.eql('198~')
+    })
+  })
+})
+