fix(log/*): add preliminary logging tests

Author: Aaron Schlesinger

glide.lock

@@ -20,3 +20,4 @@ import:
   repo: https://github.com/golang/protobuf
 - package: launchpad.net/gocheck
   repo: https://github.com/go-check/check
+- package: github.com/arschles/assert

glide.yaml

@@ -0,0 +1,51 @@
+package log
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/arschles/assert"
+)
+
+var (
+	world = "world"
+)
+
+func getWriters() (io.Writer, *bytes.Buffer, io.Writer, *bytes.Buffer) {
+	var out, err bytes.Buffer
+	stdout, stderr := io.MultiWriter(os.Stdout, &out), io.MultiWriter(os.Stderr, &err)
+	return stdout, &out, stderr, &err
+}
+
+func TestMsg(t *testing.T) {
+	stdout, _, stderr, _ := getWriters()
+	lg := NewLogger(stdout, stderr, true)
+	lg.Msg("hello %s", world)
+}
+
+func TestErr(t *testing.T) {
+	stdout, _, stderr, _ := getWriters()
+	lg := NewLogger(stdout, stderr, true)
+	lg.Err("hello %s", world)
+}
+
+func TestInfo(t *testing.T) {
+	stdout, _, stderr, err := getWriters()
+	lg := NewLogger(stdout, stderr, true)
+	lg.Info("hello %s", world)
+	assert.Equal(t, err.Len(), 0, "stderr buffer length")
+}
+
+func TestDebug(t *testing.T) {
+	stdout, out, stderr, err := getWriters()
+	lgOn := NewLogger(stdout, stderr, true)
+	lgOff := NewLogger(stdout, stderr, false)
+	lgOff.Debug("hello %s", world)
+	assert.Equal(t, out.Len(), 0, "stdout buffer length")
+	assert.Equal(t, err.Len(), 0, "stderr buffer length")
+	lgOn.Debug("hello %s", world)
+	assert.Equal(t, err.Len(), 0, "stderr buffer length")
+	assert.True(t, out.Len() > 0, "stdout buffer was empty, expected it to have debug output")
+}