test: add picofont unit tests

Author: elgopher

picofont/picofont_test.go

@@ -0,0 +1,49 @@
+// Copyright 2025 Jacek Olszak
+// This code is licensed under MIT license (see LICENSE for details)
+
+package picofont_test
+
+import (
+	_ "embed"
+	"strings"
+	"testing"
+
+	"github.com/elgopher/pi"
+	"github.com/elgopher/pi/picofont"
+	"github.com/elgopher/pi/pitest"
+)
+
+//go:embed "font.png"
+var fontPNG []byte
+
+func TestPrint(t *testing.T) {
+	t.Run("should print each character", func(t *testing.T) {
+		pi.SetScreenSize(128, 128)
+
+		pi.Palette = pi.DecodePalette(fontPNG)
+		canvas := pi.DecodeCanvas(fontPNG)
+
+		var table strings.Builder
+
+		// print narrow characters
+		for i := 16; i < 128; i++ { // skip escape codes below 16 (such as LF)
+			table.WriteRune(rune(i))
+			table.WriteByte(' ')
+			if i%16 == 15 {
+				table.WriteByte('\n')
+			}
+		}
+		// print wide characters
+		for i := 128; i < 256; i++ {
+			table.WriteRune(rune(i))
+			if i%16 == 15 {
+				table.WriteByte('\n')
+			}
+		}
+		pi.SetColor(1)
+		// when
+		picofont.Print(table.String(), 0, 8)
+		// then
+		pitest.AssertSurfaceEqual(t, canvas, pi.Screen())
+	})
+}