github.com/meulengracht/snapd@v0.0.0-20210719210640-8bde69bcc84e/jsonutil/json_test.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2017 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package jsonutil_test
    21  
    22  import (
    23  	"encoding/json"
    24  	"strings"
    25  	"testing"
    26  
    27  	. "gopkg.in/check.v1"
    28  
    29  	"github.com/snapcore/snapd/jsonutil"
    30  )
    31  
    32  func Test(t *testing.T) { TestingT(t) }
    33  
    34  type utilSuite struct{}
    35  
    36  var _ = Suite(&utilSuite{})
    37  
    38  func (s *utilSuite) TestDecodeError(c *C) {
    39  	input := "{]"
    40  	var output interface{}
    41  	err := jsonutil.DecodeWithNumber(strings.NewReader(input), &output)
    42  	c.Assert(err, NotNil)
    43  	c.Assert(err, ErrorMatches, `invalid character ']' looking for beginning of object key string`)
    44  }
    45  
    46  func (s *utilSuite) TestDecodeErrorOnExcessData(c *C) {
    47  	input := "1000000000[1,2]"
    48  	var output interface{}
    49  	err := jsonutil.DecodeWithNumber(strings.NewReader(input), &output)
    50  	c.Assert(err, NotNil)
    51  	c.Assert(err, ErrorMatches, `cannot parse json value`)
    52  }
    53  
    54  func (s *utilSuite) TestDecodeSuccess(c *C) {
    55  	input := `{"a":1000000000, "b": 1.2, "c": "foo", "d":null}`
    56  	var output interface{}
    57  	err := jsonutil.DecodeWithNumber(strings.NewReader(input), &output)
    58  	c.Assert(err, IsNil)
    59  	c.Assert(output, DeepEquals, map[string]interface{}{
    60  		"a": json.Number("1000000000"),
    61  		"b": json.Number("1.2"),
    62  		"c": "foo",
    63  		"d": nil,
    64  	})
    65  }
    66  
    67  func (utilSuite) TestStructFields(c *C) {
    68  	type aStruct struct {
    69  		Foo int `json:"hello"`
    70  		Bar int `json:"potato,stuff"`
    71  	}
    72  	c.Assert(jsonutil.StructFields((*aStruct)(nil)), DeepEquals, []string{"hello", "potato"})
    73  }
    74  
    75  func (utilSuite) TestStructFieldsExcept(c *C) {
    76  	type aStruct struct {
    77  		Foo int `json:"hello"`
    78  		Bar int `json:"potato,stuff"`
    79  	}
    80  	c.Assert(jsonutil.StructFields((*aStruct)(nil), "potato"), DeepEquals, []string{"hello"})
    81  	c.Assert(jsonutil.StructFields((*aStruct)(nil), "hello"), DeepEquals, []string{"potato"})
    82  }
    83  
    84  func (utilSuite) TestStructFieldsSurvivesNoTag(c *C) {
    85  	type aStruct struct {
    86  		Foo int `json:"hello"`
    87  		Bar int
    88  	}
    89  	c.Assert(jsonutil.StructFields((*aStruct)(nil)), DeepEquals, []string{"hello"})
    90  }