infer compress type before decode NBT fail

save/playerdata_test.go

@@ -0,0 +1,33 @@
+package save
+
+import (
+	"compress/gzip"
+	"os"
+	"testing"
+)
+
+func TestPlayerData(t *testing.T) {
+	f, err := os.Open("testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	r, err := gzip.NewReader(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	data, err := ReadPlayerData(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	want := PlayerData{
+		Pos:    [3]float64{-41.5, 65, -89.5},
+		Motion: [3]float64{0, -0.0784000015258789, 0},
+	}
+
+	if data != want {
+		t.Errorf("player data parse error: get %v, want %v", data, want)
+	}
+}