config and engine can load with unsaved text

1 files changed, 27 insertions, 0 deletions

diff --git a/internal/config/load_test.go b/internal/config/load_test.go
index 1cc3ac9..13ef9d8 100644
--- a/internal/config/load_test.go
+++ b/internal/config/load_test.go
@@ -115,3 +115,30 @@ func TestLockFile(t *testing.T) {
 		t.Errorf("LockFile = %q, want %q", got, want)
 	}
 }
+
+// TestLoadWithOverriddenText: LoadWith reads the text the caller supplies
+// instead of a file's own, so an editor can check what it has not saved yet
+// (GUI design §1.3); the files on disk are neither read differently nor
+// changed.
+func TestLoadWithOverriddenText(t *testing.T) {
+	h := t.TempDir()
+	t.Setenv("HOME", h)
+	main := filepath.Join(h, "krino.conf")
+	if err := os.MkdirAll(filepath.Join(h, "dirs"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	os.WriteFile(main, []byte("(include \"dl\")\n"), 0o644)
+	os.WriteFile(filepath.Join(h, "dirs", "dl.conf"), []byte("(path \"/tmp\")\n"), 0o644)
+
+	over := map[string][]byte{filepath.Join(h, "dirs", "dl.conf"): []byte("(path \"/tmp\")\n(rule \"r\" (move \"Out\"))\n")}
+	cfg, errs := LoadWith(main, over)
+	if len(errs) > 0 || len(cfg.Dirs) != 1 || len(cfg.Dirs[0].Rules) != 1 {
+		t.Fatalf("overridden text not used: %v %+v", errs, cfg.Dirs)
+	}
+	if _, errs := LoadWith(main, map[string][]byte{main: []byte("(include \"dl\"")}); len(errs) == 0 {
+		t.Error("a mistake in the overridden main file was not reported")
+	}
+	if cfg, errs := Load(main); len(errs) > 0 || len(cfg.Dirs[0].Rules) != 0 {
+		t.Errorf("the files on disk were read differently: %v %+v", errs, cfg.Dirs)
+	}
+}