After commit c018f5fd29 Fenrir is being switched over to go. If you do not want to be part of the testing process, please switch to master.

internal/presentation/indentation_test.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package presentation
+
+import "testing"
+
+func TestIndentationCountsVisibleWhitespaceAndIgnoresBlankRows(t *testing.T) {
+	for _, trial := range []struct {
+		text  string
+		level int
+		valid bool
+	}{
+		{"value", 0, true}, {"    value  ", 4, true}, {" \tvalue", 8, true},
+		{"\t \tvalue", 16, true}, {"\u00a0\u2003É", 2, true},
+		{"", 0, false}, {"   ", 0, false}, {"\t  ", 0, false},
+	} {
+		level, valid := Indentation_level([]rune(trial.text))
+		if level != trial.level || valid != trial.valid {
+			t.Fatalf("%q: %d %v", trial.text, level, valid)
+		}
+	}
+}