From b4306375e54006c67e8e7f55934c13ba12c4ab3c Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.ch>
Date: Sun, 7 Dec 2025 11:35:16 +0100
Subject: [PATCH] common/embed: check which interfaces are implemented

---
 common/embed/fs_test.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/common/embed/fs_test.go b/common/embed/fs_test.go
index 22992f0b..346ec193 100644
--- a/common/embed/fs_test.go
+++ b/common/embed/fs_test.go
@@ -6,6 +6,7 @@ package embed
 import (
 	_ "embed"
 	"io"
+	"io/fs"
 	"testing"
 
 	"akvorado/common/helpers"
@@ -30,6 +31,30 @@ func TestData(t *testing.T) {
 	if diff := helpers.Diff(string(got), expected); diff != "" {
 		t.Fatalf("ReadFull() (-got, +want):\n%s", diff)
 	}
+
+	// Small checks for interfaces
+	if _, ok := f.(io.Reader); !ok {
+		t.Fatal("f does not implement io.Reader")
+	}
+	if _, ok := f.(io.ReadCloser); !ok {
+		t.Fatal("f does not implement io.ReadCloser")
+	}
+	// Currently, this is not true, but this may become one day!
+	if _, ok := f.(fs.ReadDirFS); ok {
+		t.Error("f implements fs.ReadDirFS!")
+	}
+	if _, ok := f.(fs.ReadDirFile); ok {
+		t.Error("f implements fs.ReadDirFile!")
+	}
+	if _, ok := f.(fs.SubFS); ok {
+		t.Error("f implements fs.SubFS!")
+	}
+	if _, ok := f.(io.ReaderAt); ok {
+		t.Error("f implements io.ReaderAt!")
+	}
+	if _, ok := f.(io.Seeker); ok {
+		t.Error("f implements io.Seeker!")
+	}
 }
 
 func BenchmarkData(b *testing.B) {