Allow chaining of FileSystem methods

Author: stefanhaller

pkg/integration/components/file_system.go

@@ -10,23 +10,25 @@ type FileSystem struct {
 }
 
 // This does _not_ check the files panel, it actually checks the filesystem
-func (self *FileSystem) PathPresent(path string) {
+func (self *FileSystem) PathPresent(path string) *FileSystem {
 	self.assertWithRetries(func() (bool, string) {
 		_, err := os.Stat(path)
 		return err == nil, fmt.Sprintf("Expected path '%s' to exist, but it does not", path)
 	})
+	return self
 }
 
 // This does _not_ check the files panel, it actually checks the filesystem
-func (self *FileSystem) PathNotPresent(path string) {
+func (self *FileSystem) PathNotPresent(path string) *FileSystem {
 	self.assertWithRetries(func() (bool, string) {
 		_, err := os.Stat(path)
 		return os.IsNotExist(err), fmt.Sprintf("Expected path '%s' to not exist, but it does", path)
 	})
+	return self
 }
 
 // Asserts that the file at the given path has the given content
-func (self *FileSystem) FileContent(path string, matcher *TextMatcher) {
+func (self *FileSystem) FileContent(path string, matcher *TextMatcher) *FileSystem {
 	self.assertWithRetries(func() (bool, string) {
 		_, err := os.Stat(path)
 		if os.IsNotExist(err) {
@@ -46,4 +48,5 @@ func (self *FileSystem) FileContent(path string, matcher *TextMatcher) {
 
 		return true, ""
 	})
+	return self
 }