Add File function to create specified file

Author: jclebreton

README.md

@@ -39,6 +39,16 @@ func TestFoo(t *testing.T) {
 }
 ```
 
+### Creating specified files:
+```
+func TestFoo(t *testing.T) {
+  filet.File(t, "conf.yaml", "") // Creates a specified file
+
+  // Creates a specified file with string "some content"
+  filet.File(t, "/tmp/conf.yaml", "some content")
+}
+```
+
 ### Cleaning up after yourself:
 Filet lets you clean up after your files with `CleanUp`, which is
 most cleanly used at the beginning of a function with `defer`. For example:

filet.go

@@ -2,9 +2,11 @@ package filet
 
 import (
 	"bytes"
-	"github.com/spf13/afero"
+	"os"
 	"path/filepath"
 	"testing"
+
+	"github.com/spf13/afero"
 )
 
 // Files keeps track of files that we've used so we can clean up.
@@ -39,6 +41,22 @@ func TmpFile(t *testing.T, dir string, content string) afero.File {
 	return file
 }
 
+/*
+File Creates a specified file for us to use when testing
+*/
+func File(t *testing.T, path string, content string) afero.File {
+	file, err := appFs.OpenFile(path, os.O_RDWR|os.O_CREATE, 0600)
+	if err != nil {
+		t.Error("Failed to create the file: "+path, err)
+		return nil
+	}
+
+	file.WriteString(content)
+	Files = append(Files, file.Name())
+
+	return file
+}
+
 /*
 FileSays returns true if the file at the path contains the expected byte array
 content.

filet_test.go

@@ -1,9 +1,11 @@
 package filet
 
 import (
-	"github.com/stretchr/testify/assert"
 	"path/filepath"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestTmpDir(t *testing.T) {
@@ -29,6 +31,19 @@ func TestTmpFile(t *testing.T) {
 		"TmpFile should create a file with content")
 }
 
+func TestFile(t *testing.T) {
+	defer CleanUp(t)
+
+	// Test that file is actually created
+	file := File(t, "conf.yaml", "")
+	require.FileExists(t, file.Name(), "File should create the file")
+
+	// Test that the content exists in the file
+	file = File(t, "conf.yaml", "hey there")
+	result := FileSays(t, file.Name(), []byte("hey there"))
+	assert.True(t, result, "File should create a file with content")
+}
+
 func TestFileSays(t *testing.T) {
 	defer CleanUp(t)