[tests] build RN Android from source

tests/android/app/build.gradle

@@ -13,6 +13,11 @@ apply from: "../../node_modules/react-native/react.gradle"
 def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
+// comment out when not building RN from source
+configurations.all {
+  exclude group: 'com.facebook.react', module: 'react-native'
+}
+
 android {
   compileSdkVersion 27
 //  buildToolsVersion '27.0.2'
@@ -79,9 +84,13 @@ android {
 }
 
 dependencies {
-  implementation "com.facebook.react:react-native:+"
   implementation fileTree(dir: "libs", include: ["*.jar"])
+  // uncomment when not building RN from source:
+  // implementation "com.facebook.react:react-native:+"
 
+  // compile from source
+  // comment out when not building RN from source:
+  implementation project(':ReactAndroid')
 
 
   /* ----------------------------

tests/android/build.gradle

@@ -11,6 +11,7 @@ buildscript {
     classpath 'com.google.gms:google-services:4.0.1'
     classpath 'com.google.firebase:firebase-plugins:1.1.5'
     classpath 'io.fabric.tools:gradle:1.25.4'
+    classpath 'de.undercouch:gradle-download-task:3.1.2'
   }
 }
 

tests/android/settings.gradle

@@ -1,4 +1,9 @@
 rootProject.name = 'RNFTests'
+include ':ReactAndroid'
+
+project(':ReactAndroid').projectDir = new File(
+  rootProject.projectDir, '../node_modules/react-native/ReactAndroid')
+
 include ':jet'
 project(':jet').projectDir = new File(rootProject.projectDir, '../node_modules/jet/android')