{
					"none",
					HandlerOptions{},
					`time=2000-01-02T03:04:05.000Z level=INFO msg="a message"`,
					func(s string) string { return s },
				},
				{
					"replace",
					HandlerOptions{ReplaceAttr: upperCaseKey},
					`TIME=2000-01-02T03:04:05.000Z LEVEL=INFO MSG="a message"`,
					strings.ToUpper,
				},
			} {
				t.Run(opts.name, func(t *testing.T) {
					var buf bytes.Buffer
					h := NewTextHandler(&buf, &opts.opts)

			wantJSON: `{"time":"2000-01-02T03:04:05Z","level":"INFO","msg":"message","a":"one","b":2,"":"v"}`,
		},
		{
			name:     "cap keys",
			replace:  upperCaseKey,
			attrs:    attrs,
			wantText: "TIME=2000-01-02T03:04:05.000Z LEVEL=INFO MSG=message A=one B=2",
			wantJSON: `{"TIME":"2000-01-02T03:04:05Z","LEVEL":"INFO","MSG":"message","A":"one","B":2}`,
		},
		{

		want string
	}{
		{
			"none",
			HandlerOptions{},
			`{"time":"2000-01-02T03:04:05Z","level":"INFO","msg":"m","a":1,"m":{"b":2}}`,
		},
		{
			"replace",
			HandlerOptions{ReplaceAttr: upperCaseKey},
			`{"TIME":"2000-01-02T03:04:05Z","LEVEL":"INFO","MSG":"m","A":1,"M":{"b":2}}`,
		},
	} {
		t.Run(test.name, func(t *testing.T) {
			var buf bytes.Buffer
			h := NewJSONHandler(&buf, &test.opts)