http_test.go

package gfx

import (
	"image"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestGetPNG(t *testing.T) {
	ts := testServer(palettedPNGHandler)
	defer ts.Close()

	m, err := GetPNG(ts.URL)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	p := m.(image.PalettedImage)

	if got, want := p.Bounds(), IR(0, 0, 6, 6); !got.Eq(want) {
		t.Fatalf("p.Bounds() = %v, want %v", got, want)
	}

	for _, tc := range []struct {
		x int
		y int
		i uint8
	}{
		{0, 0, 0},
		{2, 4, 6},
	} {
		if got, want := p.ColorIndexAt(tc.x, tc.y), tc.i; got != want {
			t.Fatalf("p.ColorIndexAt(%d, %d) = %v, want %v", tc.x, tc.y, got, want)
		}
	}
}

func TestGetTileset(t *testing.T) {
	ts := testServer(palettedPNGHandler)
	defer ts.Close()

	tileset, err := GetTileset(PaletteAmmo8, Pt(3, 3), ts.URL)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if got, want := len(tileset.Tiles), 4; got != want {
		t.Fatalf("len(tileset.Tiles) = %d, want %d", got, want)
	}
}

func testServer(hf http.HandlerFunc) *httptest.Server {
	return httptest.NewServer(hf)
}

func palettedPNGHandler(w http.ResponseWriter, r *http.Request) {
	w.Write(palettedPNGData)
}

var palettedPNGData = []byte{
	0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
	0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x06, 0x04, 0x03, 0x00, 0x00, 0x00, 0x12, 0xe2, 0xf2,
	0x7b, 0x00, 0x00, 0x00, 0x24, 0x50, 0x4c, 0x54, 0x45, 0x18, 0x14, 0x25, 0x00, 0x99, 0xdb, 0x12,
	0x4e, 0x89, 0x3e, 0x89, 0x48, 0xe4, 0x3b, 0x44, 0x26, 0x5c, 0x42, 0xfe, 0xae, 0x34, 0xf7, 0x76,
	0x22, 0x2c, 0xe8, 0xf5, 0x63, 0xc7, 0x4d, 0xff, 0xff, 0xff, 0x19, 0x3c, 0x3e, 0xc5, 0xc7, 0x7e,
	0x7a, 0x00, 0x00, 0x00, 0x20, 0x49, 0x44, 0x41, 0x54, 0x08, 0xd7, 0x63, 0x60, 0xe0, 0xb4, 0x64,
	0xe0, 0x62, 0x0e, 0x66, 0x60, 0x60, 0xdd, 0xca, 0xe0, 0x9e, 0x21, 0xc4, 0xe0, 0x9e, 0xa8, 0xc8,
	0xe0, 0x9e, 0x24, 0x01, 0x00, 0x23, 0xc5, 0x03, 0xa8, 0x32, 0xa9, 0x7a, 0x6f, 0x00, 0x00, 0x00,
	0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82,
}