Adds the ability to reset a form with new resetForm mutation

src/store.js

@@ -76,6 +76,13 @@ export const formulateMutations = (mutations = {}) => Object.assign({
     state.meta = Object.assign({}, state.meta, {
       [form]: Object.assign({}, state.meta[form] || {}, {[field]: data})
     })
+  },
+  resetForm (state, form) {
+    if (state.values[form]) {
+      state.values = Object.assign({}, state.values, {
+        [form]: map(state.values[form], (key, value) => undefined)
+      })
+    }
   }
 }, mutations)
 

tests/store.test.js

@@ -164,3 +164,15 @@ test('adds a validationError to existing field', async t => {
   })
   t.deepEqual(state.validationErrors, {form: {name: ['i dislike this field']}})
 })
+
+test('reset a form', async t => {
+  let state = {values: {login: {username: 'testuser', password: 'secret'}}}
+  formulateMutations().resetForm(state, 'login')
+  t.deepEqual(state.values, {login: {username: undefined, password: undefined}})
+})
+
+test('wont mutate undefined form on reset', async t => {
+  let state = {values: {login: {username: 'testuser', password: 'secret'}}}
+  formulateMutations().resetForm(state, 'register')
+  t.deepEqual(state.values, {login: {username: 'testuser', password: 'secret'}})
+})