*: Reorganize code

metadata/metadata_test.go

@@ -0,0 +1,30 @@
+package metadata
+
+import (
+	"os"
+	"path"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestExtractDocumentLeadingH1(t *testing.T) {
+	_, filename, _, _ := runtime.Caller(0)
+	dir := path.Join(path.Dir(filename), "..")
+	err := os.Chdir(dir)
+	if err != nil {
+		panic(err)
+	}
+
+	filename = "testdata/header.md"
+
+	markdown, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+
+	actual := ExtractDocumentLeadingH1(markdown)
+
+	assert.Equal(t, "a", actual)
+}