From ad114db07124cdbbeb495066faadb2ed7945ffa6 Mon Sep 17 00:00:00 2001
From: Sawyer Hollenshead <sawyerh@users.noreply.github.com>
Date: Fri, 9 Mar 2018 10:42:40 -0500
Subject: [PATCH] Accept negative currency masked values (#254)

---
 packages/core/src/components/TextField/Mask.jsx      | 2 +-
 packages/core/src/components/TextField/Mask.test.jsx | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/components/TextField/Mask.jsx b/packages/core/src/components/TextField/Mask.jsx
index c9ee9b3dd4..602d13bd12 100644
--- a/packages/core/src/components/TextField/Mask.jsx
+++ b/packages/core/src/components/TextField/Mask.jsx
@@ -31,7 +31,7 @@ export class Mask extends React.PureComponent {
 
     // 0 = number, 1 = decimals
     const parts = value.split('.');
-    const digitsRegex = /\d/g;
+    const digitsRegex = /^-|\d/g; // include a check for a beginning "-" for negative numbers
     const a = parts[0].match(digitsRegex).join('');
     const b = parts.length >= 2 && parts[1].match(digitsRegex).join('');
 
diff --git a/packages/core/src/components/TextField/Mask.test.jsx b/packages/core/src/components/TextField/Mask.test.jsx
index 892c27e0b0..460993ba04 100644
--- a/packages/core/src/components/TextField/Mask.test.jsx
+++ b/packages/core/src/components/TextField/Mask.test.jsx
@@ -114,5 +114,12 @@ describe('Mask', function() {
 
       expect(input.prop('value')).toBe('12,345,678.90');
     });
+
+    it('accepts negative values', () => {
+      const data = render({ mask: 'currency' }, { value: '-1,234' });
+      const input = data.wrapper.find('input');
+
+      expect(input.prop('value')).toBe('-1,234');
+    });
   });
 });