Add new test for multi-line YAML strings

test/valid-config.yml

@@ -1,9 +1,10 @@
+---
 check_interval: 1
 
 monitors:
   - name: Command
     command: ['echo', '$PATH']
-    alert_down: [ 'log_command', 'log_shell' ]
+    alert_down: ['log_command', 'log_shell']
     alert_every: 0
   - name: Shell
     command_shell: >
@@ -11,12 +12,12 @@ monitors:
       echo 'another line';
       echo $PATH;
       exit 1
-    alert_down: [ 'log_command', 'log_shell' ]
+    alert_down: ['log_command', 'log_shell']
     alert_after: 5
     alert_every: 0
 
 alerts:
   log_command:
-    command: [ 'echo', 'regular', '"command!!!"', "{{.MonitorName}}" ]
+    command: ['echo', 'regular', '"command!!!"', "{{.MonitorName}}"]
   log_shell:
     command_shell: echo "Failure on {{.MonitorName}} User is $USER"