Fix quotes in test (#4)

* Fix quotes in test

* query the first output file to pick up the 'name' value again and output it

grep with start and end position constaints

Author: Grifs

src/yq/config.vsh.yaml

@@ -67,7 +67,8 @@ test_resources:
       set -e
       echo "name: 'bar'" > test.yaml
       "$meta_executable" --input test.yaml --output output.yaml --eval '.name = "foo"'
-      grep 'name: "foo"' output.yaml
+      "$meta_executable" --input output.yaml --output output2.yaml --eval '.name'
+      grep "^foo$" output2.yaml
 
 engines:
   - type: docker