Add support for Firestore unit tests on macOS (#2641)

* Rename Firestore/Example/App/macOS_example to macOS

* Update paths to macOS and names to Firestore_Example_macOS

* Add Firestore_Tests_macOS target

This uses a shared Tests Info.plist. This is important because it
configures NSPrincipalClass

* Teach sync_project about Firestore_Tests_macOS

* Add files to Firestore_Tests_macOS

* Add Firestore_Tests_macOS target to the Podfile

* Add HEADER_SEARCH_PATHS to match iOS

* Force C99/C++11 conformance

* pod install after adding Firestore_Tests_macOS

* Get macOS tests to link

* Add spec test json files to the macOS tests

* Remove development code signing

* Disable app sandboxing to allow GoogleTest death tests to succeed.

Author: wilhuff

Firestore/Example/App/macOS_example/AppDelegate.h renamed to Firestore/Example/App/macOS/AppDelegate.h

@@ -19,11 +19,11 @@
         <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
         <menu title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
             <items>
-                <menuItem title="macOS_example" id="1Xt-HY-uBw">
+                <menuItem title="Firestore_Example_macOS" id="1Xt-HY-uBw">
                     <modifierMask key="keyEquivalentModifierMask"/>
-                    <menu key="submenu" title="macOS_example" systemMenu="apple" id="uQy-DD-JDr">
+                    <menu key="submenu" title="Firestore_Example_macOS" systemMenu="apple" id="uQy-DD-JDr">
                         <items>
-                            <menuItem title="About macOS_example" id="5kV-Vb-QxS">
+                            <menuItem title="About Firestore_Example_macOS" id="5kV-Vb-QxS">
                                 <modifierMask key="keyEquivalentModifierMask"/>
                                 <connections>
                                     <action selector="orderFrontStandardAboutPanel:" target="-1" id="Exp-CZ-Vem"/>
@@ -37,7 +37,7 @@
                                 <menu key="submenu" title="Services" systemMenu="services" id="hz9-B4-Xy5"/>
                             </menuItem>
                             <menuItem isSeparatorItem="YES" id="4je-JR-u6R"/>
-                            <menuItem title="Hide macOS_example" keyEquivalent="h" id="Olw-nP-bQN">
+                            <menuItem title="Hide Firestore_Example_macOS" keyEquivalent="h" id="Olw-nP-bQN">
                                 <connections>
                                     <action selector="hide:" target="-1" id="PnN-Uc-m68"/>
                                 </connections>
@@ -55,7 +55,7 @@
                                 </connections>
                             </menuItem>
                             <menuItem isSeparatorItem="YES" id="kCx-OE-vgT"/>
-                            <menuItem title="Quit macOS_example" keyEquivalent="q" id="4sb-4s-VLi">
+                            <menuItem title="Quit Firestore_Example_macOS" keyEquivalent="q" id="4sb-4s-VLi">
                                 <connections>
                                     <action selector="terminate:" target="-1" id="Te7-pn-YzF"/>
                                 </connections>
@@ -668,7 +668,7 @@
                     <modifierMask key="keyEquivalentModifierMask"/>
                     <menu key="submenu" title="Help" systemMenu="help" id="F2S-fz-NVQ">
                         <items>
-                            <menuItem title="macOS_example Help" keyEquivalent="?" id="FKE-Sm-Kum">
+                            <menuItem title="Firestore_Example_macOS Help" keyEquivalent="?" id="FKE-Sm-Kum">
                                 <connections>
                                     <action selector="showHelp:" target="-1" id="y7X-2Q-9no"/>
                                 </connections>
@@ -678,7 +678,7 @@
                 </menuItem>
             </items>
         </menu>
-        <window title="macOS_example" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g">
+        <window title="Firestore_Example_macOS" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g">
             <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
             <rect key="contentRect" x="335" y="390" width="480" height="360"/>

Firestore/Example/App/macOS_example/AppDelegate.m renamed to Firestore/Example/App/macOS/AppDelegate.m

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>com.apple.security.app-sandbox</key>
-	<true/>
+	<false/>
 	<key>com.apple.security.files.user-selected.read-only</key>
 	<true/>
 	<key>com.apple.security.network.client</key>

Firestore/Example/App/macOS_example/Assets.xcassets/AppIcon.appiconset/Contents.json renamed to Firestore/Example/App/macOS/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1010"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DAFF0CF421E64AC30062958F"
+               BuildableName = "Firestore_Example_macOS.app"
+               BlueprintName = "Firestore_Example_macOS"
+               ReferencedContainer = "container:Firestore.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "544AB1912248072200F851E6"
+               BuildableName = "Firestore_Tests_macOS.xctest"
+               BlueprintName = "Firestore_Tests_macOS"
+               ReferencedContainer = "container:Firestore.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DAFF0CF421E64AC30062958F"
+            BuildableName = "Firestore_Example_macOS.app"
+            BlueprintName = "Firestore_Example_macOS"
+            ReferencedContainer = "container:Firestore.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DAFF0CF421E64AC30062958F"
+            BuildableName = "Firestore_Example_macOS.app"
+            BlueprintName = "Firestore_Example_macOS"
+            ReferencedContainer = "container:Firestore.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DAFF0CF421E64AC30062958F"
+            BuildableName = "Firestore_Example_macOS.app"
+            BlueprintName = "Firestore_Example_macOS"
+            ReferencedContainer = "container:Firestore.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>