From d900c5dfca88b1d2ce0f28ca6ca057c7b5e5870e Mon Sep 17 00:00:00 2001
From: Iacopo Pazzaglia <iacopo.pazzaglia@hotmail.it>
Date: Sat, 27 Jan 2018 21:37:36 +0100
Subject: [PATCH] Allow tabBarTestIDProps to be a function that receive the
 focused status (#3303)

---
 packages/react-navigation/src/views/TabView/TabView.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/react-navigation/src/views/TabView/TabView.js b/packages/react-navigation/src/views/TabView/TabView.js
index 82a564b0..b978a1c9 100644
--- a/packages/react-navigation/src/views/TabView/TabView.js
+++ b/packages/react-navigation/src/views/TabView/TabView.js
@@ -64,13 +64,15 @@ class TabView extends React.PureComponent {
     return options.tabBarOnPress;
   };
 
-  _getTestIDProps = ({ route }) => {
+  _getTestIDProps = ({ route, focused }) => {
     const options = this.props.router.getScreenOptions(
       this.props.childNavigationProps[route.key],
       this.props.screenProps || {}
     );
 
-    return options.tabBarTestIDProps;
+    return typeof options.tabBarTestIDProps === 'function'
+      ? options.tabBarTestIDProps({ focused })
+      : options.tabBarTestIDProps;
   };
 
   _renderIcon = ({ focused, route, tintColor }) => {