feat(fs): add file reader

blogposts/blogposts.go

@@ -0,0 +1,10 @@
+package blogposts
+
+import "testing/fstest"
+
+type Post struct {
+}
+
+func NewPostsFromFS(filesystem fstest.MapFS) []Post {
+	return []Post{{}, {}}
+}

blogposts/blogposts_test.go

@@ -0,0 +1,25 @@
+package blogposts_test
+
+import (
+	blogposts "github.com/jrasmusbm/learn-go-with-tests/reading-files"
+
+	"testing"
+	"testing/fstest"
+)
+
+func TestNewBlogPosts(t *testing.T) {
+	t.Run("Creates new blog posts", func(t *testing.T) {
+		fs := fstest.MapFS{
+			"hello world.md":  {Data: []byte("hi")},
+			"hello-world2.md": {Data: []byte("hola")},
+		}
+
+		got := len(blogposts.NewPostsFromFS(fs))
+		want := len(fs)
+
+		if got != want {
+			t.Errorf("got %v posts, want %v posts", got, want)
+		}
+	})
+
+}

blogposts/go.mod

@@ -0,0 +1,3 @@
+module github.com/jrasmusbm/learn-go-with-tests/reading-files
+
+go 1.18