[Infra] Add check for unexpected test failures in build.sh

scripts/build.sh

@@ -110,10 +110,12 @@ source scripts/check_secrets.sh
 function RunXcodebuild() {
   echo xcodebuild "$@"
 
-  xcbeautify_cmd=(xcbeautify --renderer github-actions)
+  xcbeautify_cmd=(xcbeautify --renderer github-actions --disable-logging)
 
   result=0
-  xcodebuild "$@" | tee xcodebuild.log | "${xcbeautify_cmd[@]}" || result=$?
+  xcodebuild "$@" | tee xcodebuild.log | "${xcbeautify_cmd[@]}" \
+    && CheckUnexpectedFailures xcodebuild.log \
+    || result=$?
 
   if [[ $result == 65 ]]; then
     ExportLogs "$@"
@@ -122,7 +124,9 @@ function RunXcodebuild() {
     sleep 5
 
     result=0
-    xcodebuild "$@" | tee xcodebuild.log | "${xcbeautify_cmd[@]}" || result=$?
+    xcodebuild "$@" | tee xcodebuild.log | "${xcbeautify_cmd[@]}" \
+      && CheckUnexpectedFailures xcodebuild.log \
+      || result=$?
   fi
 
   if [[ $result != 0 ]]; then
@@ -138,6 +142,15 @@ function ExportLogs() {
   python "${scripts_dir}/xcresult_logs.py" "$@"
 }
 
+function CheckUnexpectedFailures() {
+  local log_file=$1
+
+  if grep -Eq "[1-9]\d* failures \([1-9]\d* unexpected\)" "$log_file"; then
+    echo "xcodebuild failed with unexpected failures." 1>&2
+    return 65
+  fi
+}
+
 if [[ "$xcode_major" -lt 15 ]]; then
   ios_flags=(
     -sdk 'iphonesimulator'