diff --git a/cmd/gignore/create_test.go b/cmd/gignore/create_test.go
index 5ba7dd9..202e746 100644
--- a/cmd/gignore/create_test.go
+++ b/cmd/gignore/create_test.go
@@ -31,12 +31,12 @@ func (m mockFileWriter) Write(content []byte) (int, error) {
 }
 
 func TestCreateSuccess(t *testing.T) {
+	var templateBuffer bytes.Buffer
 	client := gignore.New(
 		gignore.WithTemplateDirectory(gignore.DefaultTemplateDirectory),
+		gignore.WithFileWriter(mockFileWriter{out: &templateBuffer}),
 	)
 	ctx := context.WithValue(context.Background(), clientKey, client)
-	var templateBuffer bytes.Buffer
-	client.Writer = mockFileWriter{out: &templateBuffer}
 
 	var outBuffer bytes.Buffer
 	err := createTemplate(ctx, &outBuffer, "go")
diff --git a/gignore.go b/gignore.go
index 3916f5e..728b84c 100644
--- a/gignore.go
+++ b/gignore.go
@@ -16,7 +16,7 @@ const DefaultTemplateDirectory = "gitignoreio"
 // Client is a client for managing .gitignore templates.
 type Client struct {
 	registry *registry.TemplateRegistry
-	Writer   io.Writer
+	writer   io.Writer
 }
 
 // New creates a new Client with the provided options.
@@ -85,7 +85,7 @@ func (c *Client) Create(template string) error {
 		return err
 	}
 
-	_, err = c.Writer.Write(content)
+	_, err = c.writer.Write(content)
 	if err != nil {
 		return err
 	}
diff --git a/option.go b/option.go
index 9f11d1c..d07b086 100644
--- a/option.go
+++ b/option.go
@@ -1,5 +1,7 @@
 package gignore
 
+import "io"
+
 // Option is a function that configures a GignoreClient.
 type Option func(*Client)
 
@@ -9,3 +11,10 @@ func WithTemplateDirectory(directory string) Option {
 		c.registry.Directory = directory
 	}
 }
+
+// WithFileWriter sets the file writer for the GignoreClient.
+func WithFileWriter(writer io.Writer) Option {
+	return func(c *Client) {
+		c.writer = writer
+	}
+}