// TestPingWireErrors performs negative tests against wire encode and decode
// of MsgPing to confirm error paths work correctly.
func TestPingWireErrors(t *testing.T) {
	pver := btcwire.ProtocolVersion

	tests := []struct {
		in       *btcwire.MsgPing // Value to encode
		buf      []byte           // Wire encoding
		pver     uint32           // Protocol version for wire encoding
		max      int              // Max size of fixed buffer to induce errors
		writeErr error            // Expected write error
		readErr  error            // Expected read error
	}{
		// Latest protocol version with intentional read/write errors.
		{
			&btcwire.MsgPing{Nonce: 123123}, // 0x1e0f3
			[]byte{0xf3, 0xe0, 0x01, 0x00},
			pver,
			2,
			io.ErrShortWrite,
			io.ErrUnexpectedEOF,
		},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode to wire format.
		w := newFixedWriter(test.max)
		err := test.in.BtcEncode(w, test.pver)
		if err != test.writeErr {
			t.Errorf("BtcEncode #%d wrong error got: %v, want: %v",
				i, err, test.writeErr)
			continue
		}

		// Decode from wire format.
		var msg btcwire.MsgPing
		r := newFixedReader(test.max, test.buf)
		err = msg.BtcDecode(r, test.pver)
		if err != test.readErr {
			t.Errorf("BtcDecode #%d wrong error got: %v, want: %v",
				i, err, test.readErr)
			continue
		}
	}
}

// TestPingWire tests the MsgPing wire encode and decode for various protocol
// versions.
func TestPingWire(t *testing.T) {
	tests := []struct {
		in   btcwire.MsgPing // Message to encode
		out  btcwire.MsgPing // Expected decoded message
		buf  []byte          // Wire encoding
		pver uint32          // Protocol version for wire encoding
	}{
		// Latest protocol version.
		{
			btcwire.MsgPing{Nonce: 123123}, // 0x1e0f3
			btcwire.MsgPing{Nonce: 123123}, // 0x1e0f3
			[]byte{0xf3, 0xe0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00},
			btcwire.ProtocolVersion,
		},

		// Protocol version BIP0031Version+1
		{
			btcwire.MsgPing{Nonce: 456456}, // 0x6f708
			btcwire.MsgPing{Nonce: 456456}, // 0x6f708
			[]byte{0x08, 0xf7, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00},
			btcwire.BIP0031Version + 1,
		},

		// Protocol version BIP0031Version
		{
			btcwire.MsgPing{Nonce: 789789}, // 0xc0d1d
			btcwire.MsgPing{Nonce: 0},      // No nonce for pver
			[]byte{},                       // No nonce for pver
			btcwire.BIP0031Version,
		},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode the message to wire format.
		var buf bytes.Buffer
		err := test.in.BtcEncode(&buf, test.pver)
		if err != nil {
			t.Errorf("BtcEncode #%d error %v", i, err)
			continue
		}
		if !bytes.Equal(buf.Bytes(), test.buf) {
			t.Errorf("BtcEncode #%d\n got: %s want: %s", i,
				spew.Sdump(buf.Bytes()), spew.Sdump(test.buf))
			continue
		}

		// Decode the message from wire format.
		var msg btcwire.MsgPing
		rbuf := bytes.NewReader(test.buf)
		err = msg.BtcDecode(rbuf, test.pver)
		if err != nil {
			t.Errorf("BtcDecode #%d error %v", i, err)
			continue
		}
		if !reflect.DeepEqual(msg, test.out) {
			t.Errorf("BtcDecode #%d\n got: %s want: %s", i,
				spew.Sdump(msg), spew.Sdump(test.out))
			continue
		}
	}
}