Move PreviewTests into their own scheme. (#2492)

* Use xcresultparser for coverage as there are 2 schemes now.

PreviewTests/SupportingFiles/Info.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

PreviewTests/SupportingFiles/PreviewTests.xctestplan

@@ -0,0 +1,32 @@
+{
+  "configurations" : [
+    {
+      "id" : "D789E5F1-30B8-4A23-B20E-281ACE05CFD6",
+      "name" : "Default",
+      "options" : {
+
+      }
+    }
+  ],
+  "defaultOptions" : {
+    "defaultTestExecutionTimeAllowance" : 60,
+    "environmentVariableEntries" : [
+      {
+        "key" : "IS_RUNNING_UNIT_TESTS",
+        "value" : "1"
+      }
+    ],
+    "testExecutionOrdering" : "random",
+    "testTimeoutsEnabled" : true
+  },
+  "testTargets" : [
+    {
+      "target" : {
+        "containerPath" : "container:ElementX.xcodeproj",
+        "identifier" : "7A17BE29BAC81ADBAC6349D9",
+        "name" : "PreviewTests"
+      }
+    }
+  ],
+  "version" : 1
+}

PreviewTests/SupportingFiles/target.yml

@@ -0,0 +1,51 @@
+name: PreviewTests
+
+schemes:
+  PreviewTests:
+    analyze:
+      config: Debug
+    archive:
+      config: Release
+    build:
+      targets:
+        PreviewTests: all
+    profile:
+      config: Release
+    run:
+      config: Debug
+      disableMainThreadChecker: false
+    test:
+      config: Debug
+      disableMainThreadChecker: false
+      gatherCoverageData: true
+      coverageTargets:
+        - ElementX
+      testPlans:
+        - path: PreviewTests.xctestplan
+          defaultPlan: true
+
+targets:
+  PreviewTests:
+    type: bundle.unit-test
+    platform: iOS
+    
+    buildToolPlugins:
+    - plugin: PrefireTestsPlugin
+      package: Prefire
+
+    dependencies:
+    - target: ElementX
+    - package: SnapshotTesting
+
+    info:
+      path: ../SupportingFiles/Info.plist
+
+    settings:
+      base:
+        PRODUCT_NAME: PreviewTests
+        PRODUCT_BUNDLE_IDENTIFIER: ${BASE_BUNDLE_IDENTIFIER}.preview.tests
+      debug:
+      release:
+
+    sources:
+    - path: ../SupportingFiles