e.trim is not a function fix

old-ui/app/components/add-token/add-token.component.js

@@ -501,7 +501,8 @@ class AddTokenScreen extends Component {
   }
 
   handleCustomDecimalsChange = (value) => {
-    const customDecimals = (value && value.trim())
+    let customDecimals = Number(value && value.toString().trim())
+    customDecimals = isNaN(customDecimals) ? '' : customDecimals
     const validDecimals = customDecimals !== null &&
       customDecimals !== '' &&
       customDecimals >= 0 &&

test/unit/ui/add-token.spec.js

@@ -40,4 +40,41 @@ describe('Add Token Screen', function () {
     })
 
   })
+
+  describe('#HandleCustomDecimalsChange', () => {
+    it.only('sets correct decimals', () => {
+      addTokenComponent.instance().handleCustomDecimalsChange(18)
+      const state = addTokenComponent.state()
+      assert.equal(state.customDecimals, 18)
+      assert.equal(state.customDecimalsError, null)
+    })
+
+    it.only('sets correct decimals', () => {
+      addTokenComponent.instance().handleCustomDecimalsChange(0)
+      const state = addTokenComponent.state()
+      assert.equal(state.customDecimals, 0)
+      assert.equal(state.customDecimalsError, null)
+    })
+
+    it.only('sets customDecimalsError', () => {
+      addTokenComponent.instance().handleCustomDecimalsChange('test')
+      const state = addTokenComponent.state()
+      assert.equal(state.customDecimals, '')
+      assert.equal(state.customDecimalsError, 'Decimals must be at least 0, and not over 36.')
+    })
+
+    it.only('sets customDecimalsError', () => {
+      addTokenComponent.instance().handleCustomDecimalsChange({})
+      const state = addTokenComponent.state()
+      assert.equal(state.customDecimals, '')
+      assert.equal(state.customDecimalsError, 'Decimals must be at least 0, and not over 36.')
+    })
+
+    it.only('sets customDecimalsError', () => {
+      addTokenComponent.instance().handleCustomDecimalsChange()
+      const state = addTokenComponent.state()
+      assert.equal(state.customDecimals, '')
+      assert.equal(state.customDecimalsError, 'Decimals must be at least 0, and not over 36.')
+    })
+  })
 })