packer.Ui tests

Makefile

@@ -3,4 +3,7 @@ all:
 	go get -d
 	go build -a -o bin/packer
 
-.PHONY: all
+test:
+	go test ./...
+
+.PHONY: all test

packer/environment_test.go

+package packer
+
+

packer/ui_test.go

+package packer
+
+import (
+	"bytes"
+	"testing"
+	"cgl.tideland.biz/asserts"
+)
+
+// Our test Ui that just writes to bytes.Buffers.
+var bufferUi = &ReaderWriterUi{ new(bytes.Buffer), new(bytes.Buffer) }
+
+func TestReaderWriterUi_Say(t *testing.T) {
+	assert := asserts.NewTestingAsserts(t, true)
+
+	bufferUi.Say("foo")
+	assert.Equal(readWriter(bufferUi), "foo", "basic output")
+
+	bufferUi.Say("%d", 5)
+	assert.Equal(readWriter(bufferUi), "5", "formatting")
+}
+
+// This reads the output from the bytes.Buffer in our test object
+// and then resets the buffer.
+func readWriter(ui *ReaderWriterUi) (result string) {
+	buffer := ui.Writer.(*bytes.Buffer)
+	result = buffer.String()
+	buffer.Reset()
+	return
+}