blogposts: create new file for post and a helper func

blogposts/blogposts.go

@@ -1,15 +1,9 @@
 package blogposts
 
 import (
-	"io"
 	"io/fs"
 )
 
-type Post struct {
-	Title, Description, Body string
-	Tags                     []string
-}
-
 func NewPostsFromFS(fileSystem fs.FS) ([]Post, error) {
 	dir, err := fs.ReadDir(fileSystem, ".")
 	if err != nil {
@@ -25,25 +19,3 @@ func NewPostsFromFS(fileSystem fs.FS) ([]Post, error) {
 	}
 	return posts, nil
 }
-
-func getPost(fileSystem fs.FS, fileName string) (Post, error) {
-	postFile, err := fileSystem.Open(fileName)
-	if err != nil {
-		return Post{}, err
-	}
-	defer postFile.Close()
-
-	return newPost(postFile)
-}
-
-// NOTE: Does newPost have to be coupled to an fs.File ?
-// Do we use all the methods and data from this type? What do we really need?
-func newPost(postFile io.Reader) (Post, error) {
-	postData, err := io.ReadAll(postFile)
-	if err != nil {
-		return Post{}, err
-	}
-
-	post := Post{Title: string(postData)[7:]}
-	return post, nil
-}

blogposts/blogposts_test.go

@@ -33,7 +33,11 @@ func TestNewBlogPosts(t *testing.T) {
 
 	got := posts[0]
 	want := Post{Title: "Post 1"}
+	assertPost(t, got, want)
+}
 
+func assertPost(t testing.TB, got Post, want Post) {
+	t.Helper()
 	if !reflect.DeepEqual(got, want) {
 		t.Errorf("got %+v, want %+v", got, want)
 	}

blogposts/post.go

@@ -0,0 +1,33 @@
+package blogposts
+
+import (
+	"io"
+	"io/fs"
+)
+
+type Post struct {
+	Title, Description, Body string
+	Tags                     []string
+}
+
+func getPost(fileSystem fs.FS, fileName string) (Post, error) {
+	postFile, err := fileSystem.Open(fileName)
+	if err != nil {
+		return Post{}, err
+	}
+	defer postFile.Close()
+
+	return newPost(postFile)
+}
+
+// NOTE: Does newPost have to be coupled to an fs.File ?
+// Do we use all the methods and data from this type? What do we really need?
+func newPost(postFile io.Reader) (Post, error) {
+	postData, err := io.ReadAll(postFile)
+	if err != nil {
+		return Post{}, err
+	}
+
+	post := Post{Title: string(postData)[7:]}
+	return post, nil
+}