Fix incompatibility with react-test-renderer (#147)

.size-snapshot.json

@@ -1,12 +1,12 @@
 {
   "dist/react-input-mask.js": {
-    "bundled": 38128,
-    "minified": 13804,
-    "gzipped": 4839
+    "bundled": 38566,
+    "minified": 13915,
+    "gzipped": 4878
   },
   "lib/react-input-mask.development.js": {
-    "bundled": 33933,
-    "minified": 14851,
-    "gzipped": 4649
+    "bundled": 34353,
+    "minified": 14960,
+    "gzipped": 4689
   }
 }

src/index.js

@@ -69,6 +69,12 @@ class InputElement extends React.Component {
   componentDidMount() {
     this.mounted = true;
 
+    // workaround for react-test-renderer
+    // https://github.com/sanniassin/react-input-mask/issues/147
+    if (!this.getInputDOMNode()) {
+      return;
+    }
+
     this.isWindowsPhoneBrowser = isWindowsPhoneBrowser();
 
     if (this.maskOptions.mask && this.getInputValue() !== this.value) {
@@ -200,6 +206,15 @@ class InputElement extends React.Component {
     }
 
     let input = findDOMNode(this);
+    const isDOMNode = typeof window !== 'undefined'
+                      &&
+                      input instanceof window.HTMLElement;
+
+    // workaround for react-test-renderer
+    // https://github.com/sanniassin/react-input-mask/issues/147
+    if (input && !isDOMNode) {
+      return null;
+    }
 
     if (input.nodeName !== 'INPUT') {
       input = input.querySelector('input');