Adding read command

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

onerng_test.go

@@ -0,0 +1,34 @@
+package onerng
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNoiseCommand(t *testing.T) {
+	fmt.Println(DisableWhitener)
+	fmt.Println(EnableRF)
+	fmt.Println(DisableAvalanche)
+
+	fmt.Println(Default)
+	fmt.Println(Silent)
+
+	testdata := []struct {
+		flags ReadMode
+		cmd   string
+	}{
+		{Default, "cmd0\n"},
+		{DisableWhitener, "cmd1\n"},
+		{EnableRF, "cmd2\n"},
+		{EnableRF | DisableWhitener, "cmd3\n"},
+		{DisableAvalanche, "cmd4\n"},
+		{DisableAvalanche | DisableWhitener, "cmd5\n"},
+		{DisableAvalanche | EnableRF, "cmd6\n"},
+		{DisableAvalanche | EnableRF | DisableWhitener, "cmd7\n"},
+	}
+	for _, d := range testdata {
+		assert.Equal(t, d.cmd, NoiseCommand(d.flags), d.cmd, d.flags)
+	}
+}