Simpleish level-based logging library and the start of some tests.

logging/log_test.go

@@ -0,0 +1,32 @@
+package logging
+
+import (
+	"os"
+	"testing"
+)
+
+type mockWriter struct {
+	written []byte
+}
+
+func (w *mockWriter) Write(p []byte) (n int, err os.Error) {
+	w.written = append(w.written, p...)
+	return len(p), nil
+}
+
+func TestDefaultLogging(t *testing.T) {
+	w := &mockWriter{make([]byte, 0)}
+	l := New(w, LogError, false)
+	l.Log(4, "Nothing should be logged yet")
+	l.Log(LogDebug, "or yet...")
+	l.Log(LogWarn, "or yet!")
+	if len(w.written) > 0 {
+		t.Errorf("Unexpected low-level logging output.")
+	}
+	l.Log(LogError, "Error!")
+	// Note: the below is deliberately fragile to ensure
+	// the right file:line is logged on errors. Sorry!
+	if s := string(w.written); s[20:] != "log_test.go:26: Error!\n" {
+		t.Errorf("Error incorrectly logged (check line numbers!)")
+	}
+}