Feat/Add testID prop for locating the view in end-to-end tests (ptomasroos#212)

Author: jamesl1001

MultiSlider.js

@@ -47,6 +47,7 @@ export default class MultiSlider extends React.Component {
     vertical: false,
     minMarkerOverlapDistance: 0,
     minMarkerOverlapStepDistance: 0,
+    testID: '',
   };
 
   constructor(props) {
@@ -562,7 +563,7 @@ export default class MultiSlider extends React.Component {
     );
 
     return (
-      <View>
+      <View testID={this.props.testID}>
         {this.props.enableLabel && (
           <Label
             oneMarkerValue={this.state.valueOne}

README.md

@@ -102,3 +102,4 @@ Feel free to contribute to this part of the documentation.
 | minMarkerOverlapDistance | 0 | number | if this is > 0 and allowOverlap is false, this value will determine the closest two markers can come to each other (in pixels, not steps). This can be used for cases where you have two markers large cursors and you don't want them to overlap. Note that markers will still overlap at the start if starting values are too near. CANNOT be combined with minMarkerOverlapDistance |
 | minMarkerOverlapStepDistance | 0 | number | if this is > 0 and allowOverlap is false, this value will determine the closest two markers can come to each other (in steps, not pixels). This can be used for cases where you have two markers large cursors and you don't want them to overlap. Note that markers will still overlap at the start if starting values are too near. CANNOT be combined with minMarkerOverlapStepDistance |
 | imageBackgroundSource | undefined | string | Specifies the source as required by [ImageBackground](https://facebook.github.io/react-native/docs/imagebackground)|
+| testID |  | string | Used to locate this view in end-to-end tests. |