Add 16-bit register mock device

tester/device16_test.go

@@ -0,0 +1,42 @@
+package tester
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestCreate16(t *testing.T) {
+	c := qt.New(t)
+	bus := NewI2CBus(c)
+	d := NewI2CDevice16(c, 8)
+	bus.AddDevice(d)
+}
+
+func TestRead16(t *testing.T) {
+	c := qt.New(t)
+	bus := NewI2CBus(c)
+	d := NewI2CDevice16(c, 8)
+	bus.AddDevice(d)
+
+	// Setup a random register
+	d.Registers[3] = 0x1234
+
+	buf := []byte{0, 0}
+	err := bus.ReadRegister(8, 3, buf)
+	c.Assert(err, qt.IsNil)
+	c.Assert(buf[0], qt.Equals, byte(0x12))
+	c.Assert(buf[1], qt.Equals, byte(0x34))
+}
+
+func TestWrite16(t *testing.T) {
+	c := qt.New(t)
+	bus := NewI2CBus(c)
+	d := NewI2CDevice16(c, 8)
+	bus.AddDevice(d)
+
+	d.Registers[9] = 0x0
+	err := bus.WriteRegister(8, 9, []byte{0xbe, 0xad})
+	c.Assert(err, qt.IsNil)
+	c.Assert(d.Registers[9], qt.Equals, uint16(0xbead))
+}