Add "json" as output type (#513)

Co-authored-by: Norwin <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/513
Reviewed-by: Norwin <noerw@noreply.gitea.io>
Reviewed-by: strk <strk@noreply.gitea.io>

modules/print/table_test.go

@@ -0,0 +1,40 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package print
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestToSnakeCase(t *testing.T) {
+	assert.EqualValues(t, "some_test_var_at2d", toSnakeCase("SomeTestVarAt2d"))
+}
+
+func TestPrint(t *testing.T) {
+	tData := &table{
+		headers: []string{"A", "B"},
+		values: [][]string{
+			{"new a", "some bbbb"},
+			{"AAAAA", "b2"},
+		},
+	}
+
+	buf := &bytes.Buffer{}
+
+	tData.fprint(buf, "json")
+	result := []struct {
+		A string
+		B string
+	}{}
+	assert.NoError(t, json.NewDecoder(buf).Decode(&result))
+
+	if assert.Len(t, result, 2) {
+		assert.EqualValues(t, "new a", result[0].A)
+	}
+}