feat: filter and search by tag

internal/storage/storage_test.go

@@ -51,3 +51,20 @@ func TestNoteStorageGetUpdate(t *testing.T) {
 		t.Errorf("Updating a note should reflect it in storage. Wanted '%s', got '%s'\n", n1.Content, nn2.Content)
 	}
 }
+
+func TestNoteStorageSearch_Tags(t *testing.T) {
+	ns = NewNoteStorage()
+
+	n := note.NewNote()
+	n.Path = "note3.md"
+	n.ID = note.GenerateNoteID(n.Path)
+	n.Content = "no tag here"
+	n.Tags = []string{"devops", "go"}
+
+	ns.Create(n)
+
+	results := ns.Search("go")
+	if len(results) != 1 {
+		t.Fatalf("expected 1 result, got %d", len(results))
+	}
+}