Adding upstream version 0.0~git20250520.a1d9079+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

exp/font/font_test.go

@@ -0,0 +1,57 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux || darwin
+
+package font
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+)
+
+func looksLikeATTF(b []byte) error {
+	if len(b) < 256 {
+		return fmt.Errorf("not a TTF: not enough data")
+	}
+	b = b[:256]
+
+	// Look for the 4-byte magic header. See
+	// http://www.microsoft.com/typography/otspec/otff.htm
+	switch string(b[:4]) {
+	case "\x00\x01\x00\x00", "ttcf":
+		// No-op.
+	default:
+		return fmt.Errorf("not a TTF: missing magic header")
+	}
+
+	// Look for a glyf table.
+	if i := bytes.Index(b, []byte("glyf")); i < 0 {
+		return fmt.Errorf(`not a TTF: missing "glyf" table`)
+	} else if i%0x10 != 0x0c {
+		return fmt.Errorf(`not a TTF: invalid "glyf" offset 0x%02x`, i)
+	}
+	return nil
+}
+
+func TestLoadDefault(t *testing.T) {
+	def, err := buildDefault()
+	if err != nil {
+		t.Skip("default font not found")
+	}
+	if err := looksLikeATTF(def); err != nil {
+		t.Errorf("default font: %v", err)
+	}
+}
+
+func TestLoadMonospace(t *testing.T) {
+	mono, err := buildMonospace()
+	if err != nil {
+		t.Skip("mono font not found")
+	}
+	if err := looksLikeATTF(mono); err != nil {
+		t.Errorf("monospace font: %v", err)
+	}
+}