Make zap.AtomicLevel implement fmt.Stringer

level.go

@@ -98,6 +98,11 @@ func (lvl AtomicLevel) SetLevel(l zapcore.Level) {
 	lvl.l.Store(int32(l))
 }
 
+// String returns the string representation of the underlying Level.
+func (lvl AtomicLevel) String() string {
+	return lvl.Level().String()
+}
+
 // UnmarshalText unmarshals the text to an AtomicLevel. It uses the same text
 // representations as the static zapcore.Levels ("debug", "info", "warn",
 // "error", "dpanic", "panic", and "fatal").

level_test.go

@@ -111,6 +111,7 @@ func TestAtomicLevelText(t *testing.T) {
 			marshaled, err := lvl.MarshalText()
 			assert.NoError(t, err, `Unexpected error marshalling level "%v" to text.`, tt.expect)
 			assert.Equal(t, tt.text, string(marshaled), "Expected marshaled text to match")
+			assert.Equal(t, tt.text, lvl.String(), "Expected Stringer call to match")
 		}
 	}
 }