compose should return exit code from test runner

Author: Garvin

.travis.yml

@@ -6,4 +6,4 @@ services:
   - docker
 
 script:
-- docker-compose -f docker-compose-test.yaml up --force-recreate --build test-runner 
+- docker-compose -f docker-compose-test.yaml up --force-recreate --exit-code-from test-runner --build test-runner 

test/DatatablesParser.Tests/test-runner.sh

@@ -1,10 +1,11 @@
 #!/bin/bash
 
 echo "Restore and build while db servers are starting"
+
 dotnet restore
 dotnet build
 echo "Testing connections to test db servers"
-while !  nc -w 1 mssql 1433 && nc -w 1 mysql 3306  ; do 
+while ! ( nc -w 1 mssql 1433 &> /dev/null && nc -w 1 mysql 3306 &> /dev/null ) ; do 
     sleep 1; 
     echo "Test db servers not ready. Trying again"
 done