Add Name() to Logger (#1273)

Adds the `Name()` function to `Logger`, which will return the logger's name, if configured.

logger.go

@@ -281,6 +281,12 @@ func (log *Logger) Core() zapcore.Core {
 	return log.core
 }
 
+// Name returns the Logger's underlying name,
+// or an empty string if the logger is unnamed.
+func (log *Logger) Name() string {
+	return log.name
+}
+
 func (log *Logger) clone() *Logger {
 	copy := *log
 	return &copy

logger_test.go

@@ -340,15 +340,17 @@ func TestLoggerNames(t *testing.T) {
 			}
 			log.Info("")
 			require.Equal(t, 1, logs.Len(), "Expected only one log entry to be written.")
-			assert.Equal(t, tt.expected, logs.AllUntimed()[0].LoggerName, "Unexpected logger name.")
+			assert.Equal(t, tt.expected, logs.AllUntimed()[0].LoggerName, "Unexpected logger name from entry.")
+			assert.Equal(t, tt.expected, log.Name(), "Unexpected logger name.")
 		})
 		withSugar(t, DebugLevel, nil, func(log *SugaredLogger, logs *observer.ObservedLogs) {
 			for _, n := range tt.names {
 				log = log.Named(n)
 			}
 			log.Infow("")
 			require.Equal(t, 1, logs.Len(), "Expected only one log entry to be written.")
-			assert.Equal(t, tt.expected, logs.AllUntimed()[0].LoggerName, "Unexpected logger name.")
+			assert.Equal(t, tt.expected, logs.AllUntimed()[0].LoggerName, "Unexpected logger name from entry.")
+			assert.Equal(t, tt.expected, log.base.Name(), "Unexpected logger name.")
 		})
 	}
 }