[tests][ios] update Podfile

tests/ios/Podfile

@@ -1,3 +1,6 @@
+require 'json'
+package = JSON.parse(File.read('../../package.json'))
+
 install! 'cocoapods', :deterministic_uuids => false
 # Uncomment this line to define a global platform for your project
 # platform :ios, '8.0'
@@ -7,6 +10,7 @@ target 'testing' do
   # Uncomment this line if you're using Swift or would like to use dynamic frameworks
   # use_frameworks!
 
+  rnfb_version = package["version"]
   react_native_path = "../node_modules/react-native"
   pod "yoga", :path => "#{react_native_path}/ReactCommon/yoga"
 
@@ -33,7 +37,7 @@ target 'testing' do
   pod 'Fabric', '~> 1.7.11'
   pod 'Crashlytics', '~> 3.10.7'
 
-  pod 'RNFirebase', :path => '../../ios/RNFirebase.podspec'
+  pod 'RNFirebase', :path => '../../ios/RNFirebase.podspec', :version => "~> #{rnfb_version}"
 
   post_install do |installer|
     installer.pods_project.targets.each do |target|

tests/ios/Podfile.lock

@@ -305,6 +305,7 @@ EXTERNAL SOURCES:
     :path: "../node_modules/react-native"
   RNFirebase:
     :path: "../../ios/RNFirebase.podspec"
+    :version: "~> 5.0.0-rc5"
   yoga:
     :path: "../node_modules/react-native/ReactCommon/yoga"
 
@@ -347,6 +348,6 @@ SPEC CHECKSUMS:
   RNFirebase: 2b25fd2e60269f26bb0a76c71dcc942b35a77df0
   yoga: b1ce48b6cf950b98deae82838f5173ea7cf89e85
 
-PODFILE CHECKSUM: 33388e8d8d1b7c967a58d636efdd0c9f4d74a9b5
+PODFILE CHECKSUM: f795130025a049aa8df38dd82ec2841030247cc7
 
 COCOAPODS: 1.5.3