[Test] Introduce SPM test sample app (#97)

Author: dennycd

.gitignore

@@ -33,3 +33,4 @@ bazel_format_virtual_environment/
 # SPM
 .build/
 Package.resolved
+.swiftpm/

scripts/build_test_spm_samples.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -ex
+
+## Build gRPC Sample App with Swift Package Manager and Verify Build Success
+
+# build configuration and paths
+SAMPLE_PRJ=tests/spm/gRPCSample/gRPCSample.xcodeproj
+SCHEME=gRPCSample
+DESTINATION='name=iPhone 11'
+
+# custom build flags
+BUILD_FLAGS="
+  GCC_TREAT_WARNINGS_AS_ERRORS=YES
+"
+
+# build via xcodebuild command line
+time xcodebuild \
+-project $SAMPLE_PRJ \
+-scheme $SCHEME \
+-verbose \
+-destination "${DESTINATION}" \
+build \
+$BUILD_FLAGS

tests/spm/README.md

@@ -0,0 +1,3 @@
+### Overview
+
+This folder contains test targets related to Swift Package Manager distribution of gRPC-iOS

tests/spm/gRPCSample/README.md

@@ -0,0 +1,8 @@
+### Overview
+
+Manually created sample app using gRPC via Swift Package Manager
+
+### Project Settings
+
+* XCode 13.3 (13E113)
+* SwiftUI & Swift

tests/spm/gRPCSample/build.xcconfig

@@ -0,0 +1,12 @@
+//
+//  build.xcconfig
+//  gRPCSample
+//
+//  Created by Denny Dai on 6/2/22.
+//
+
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+
+GCC_TREAT_WARNINGS_AS_ERRORS = YES