Pr 384 (#505)

* Add ToUpper and ToLower to Template funcMap

Add basic ToUpper and ToLower support for Template pipelines.

* Add integration test

* Add ToLower/ToUpper documentation

* Make casing consistent on new template functions

Author: aelsabbahy

docs/manual.md

@@ -870,6 +870,8 @@ Available functions beyond text/template [built-in functions](https://golang.org
 * `readFile "fileName"` - Reads file content into a string, trims whitespace. Useful when a file contains a token.
   * **NOTE:** Goss will error out during during the parsing phase if the file does not exist, no tests will be executed.
 * `regexMatch "(some)?reg[eE]xp"` - Tests the piped input against the regular expression argument.
+* `toLower` - Changes piped input to lowercase
+* `toUpper` - Changes piped input to UPPERCASE
 
 **NOTE:** gossfiles containing text/template `{{}}` controls will no longer work with `goss add/autoadd`. One way to get around this is to split your template and static goss files and use [gossfile](#gossfile) to import.
 

integration-tests/goss/goss-shared.yaml

@@ -18,8 +18,8 @@ command:
     exit-status: 0
     skip: true
 file:
-{{range mkSlice "/etc/passwd" "/etc/group"}}
-  {{.}}:
+{{range mkSlice "/etc/PAsswD" "/etc/group"}}
+  {{. | toLower}}:
     exists: true
     mode: '0644'
     owner: root

template.go

@@ -47,6 +47,8 @@ var funcMap = map[string]interface{}{
 	"readFile":   readFile,
 	"getEnv":     getEnv,
 	"regexMatch": regexMatch,
+	"toUpper":    strings.ToUpper,
+	"toLower":    strings.ToLower,
 }
 
 func NewTemplateFilter(varsFile string) func([]byte) []byte {