Add script to determine if previous UI test results can be reused

check-previous-test-results.sh

@@ -0,0 +1,71 @@
+appfolder="$1"
+rootfolder="$2"
+changesfile="$3"
+platformkeyword="$4"
+
+previousrunfolder="$rootfolder/PreviousUITestResults"
+should_run_tests=false
+
+echo "Looking for $previousrunfolder"
+
+if test -e $previousrunfolder
+then
+	echo "Found previous build's test results folder"
+else
+	should_run_tests=true
+	echo "Previous test results folder not found"
+fi
+
+echo "Looking for $previousrunfolder/nunit_output.xml"
+
+if test -e $previousrunfolder/nunit_output.xml
+then
+	echo "Found previous NUnit results"
+else
+	should_run_tests=true
+	echo "Previous NUnit results not found"
+fi
+
+if test -e $changesfile
+then
+	echo "Found list of changes:"
+	changes_require_tests=false
+	cat $changesfile
+
+	# Look for platform-specific code changes
+	if grep -q $platformkeyword $changesfile
+	then
+		echo "Found changes to $platformkeyword stuff"
+		should_run_tests=true
+		changes_require_tests=true
+	fi
+
+	# Now check for universal stuff (Core, Issues...)
+	if grep -q -e 'Xamarin\.Forms\.Controls' -e 'Xamarin\.Forms\.Core' -e 'Xamarin\.Forms\.CustomAttributes' -e 'Xamarin\.Forms\.Xaml' $changesfile
+	then
+		echo "Found changes which require a UI Tests run"
+		should_run_tests=true
+		changes_require_tests=true
+	fi
+
+	if ! $changes_require_tests
+	then
+		echo "No changes which require a UI Tests run for $platformkeyword were found"
+	fi
+
+else
+	should_run_tests=false
+	echo "No changes in this build"
+fi
+
+if $should_run_tests
+then
+	echo "Can't reuse previous results; UI tests will be run."
+	touch $appfolder/noresults.xml
+	exit 1
+else
+	echo "We can just reuse the previous test results"
+	echo "##teamcity[importData type='nunit' path='$previousrunfolder/nunit_output.xml' parseOutOfDate='true']"
+	cp $previousrunfolder/nunit_output.xml $appfolder/nunit_output.xml
+	exit 0
+fi