json2go/json2go_test.go (view raw)
Oleksandr Smirnov
Oleksandr Smirnov
olexsmir@gmail.com refactor: use an actual parser instead of reflection..., 11 days ago
olexsmir@gmail.com refactor: use an actual parser instead of reflection..., 11 days ago
| 1 | package json2go |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "reflect" |
| 7 | "strings" |
| 8 | "testing" |
| 9 | ) |
| 10 | |
| 11 | func field(indentLvl int, name, type_ string, json_ ...string) string { |
| 12 | indent := strings.Repeat("\t", indentLvl) |
| 13 | if strings.Contains(type_, "struct") { |
| 14 | return fmt.Sprintf("\n%s%s %s", indent, name, type_) |
| 15 | } |
| 16 | |
| 17 | tag := strings.ToLower(name) |
| 18 | if len(json_) == 1 { |
| 19 | tag = json_[0] |
| 20 | } |
| 21 | return fmt.Sprintf("\n%s%s %s `json:\"%s\"`", indent, name, type_, tag) |
| 22 | } |
| 23 | |
| 24 | func TestTransform(t *testing.T) { |
| 25 | tests := map[string]struct { |
| 26 | input string |
| 27 | check func(t *testing.T, result string) |
| 28 | structName string |
| 29 | err error |
| 30 | }{ |
| 31 | "simple object": { |
| 32 | input: `{"name": "Olex", "active": true, "age": 420}`, |
| 33 | check: func(t *testing.T, result string) { |
| 34 | if !strings.Contains(result, "type Out struct") { |
| 35 | t.Errorf("missing Out struct") |
| 36 | } |
| 37 | if !strings.Contains(result, "Name string `json:\"name\"`") { |
| 38 | t.Errorf("missing Name field") |
| 39 | } |
| 40 | if !strings.Contains(result, "Active bool `json:\"active\"`") { |
| 41 | t.Errorf("missing Active field") |
| 42 | } |
| 43 | if !strings.Contains(result, "Age int `json:\"age\"`") { |
| 44 | t.Errorf("missing Age field") |
| 45 | } |
| 46 | }, |
| 47 | }, |
| 48 | "invalid json": { |
| 49 | err: ErrInvalidJSON, |
| 50 | input: `{"invalid":json}`, |
| 51 | }, |
| 52 | "invalid struct name, starts with number": { |
| 53 | err: ErrInvalidStructName, |
| 54 | structName: "1Name", |
| 55 | }, |
| 56 | "invalid struct name, has space": { |
| 57 | err: ErrInvalidStructName, |
| 58 | structName: "Name Name2", |
| 59 | }, |
| 60 | "invalid struct name, has non letter/number": { |
| 61 | err: ErrInvalidStructName, |
| 62 | structName: "Name$", |
| 63 | }, |
| 64 | "snake_case to CamelCase": { |
| 65 | input: `{"first_name": "Bob", "last_name": "Bobberson"}`, |
| 66 | check: func(t *testing.T, result string) { |
| 67 | if !strings.Contains(result, "FirstName string `json:\"first_name\"`") { |
| 68 | t.Errorf("missing FirstName field") |
| 69 | } |
| 70 | if !strings.Contains(result, "LastName string `json:\"last_name\"`") { |
| 71 | t.Errorf("missing LastName field") |
| 72 | } |
| 73 | }, |
| 74 | }, |
| 75 | "nested object and array": { |
| 76 | input: `{"user": {"name": "Alice", "score": 95.5}, "tags": ["go", "json"]}`, |
| 77 | check: func(t *testing.T, result string) { |
| 78 | if !strings.Contains(result, "type Out struct") { |
| 79 | t.Errorf("missing Out struct") |
| 80 | } |
| 81 | if !strings.Contains(result, "Tags []string") { |
| 82 | t.Errorf("missing Tags field") |
| 83 | } |
| 84 | if !strings.Contains(result, "User OutUser") { |
| 85 | t.Errorf("missing User field") |
| 86 | } |
| 87 | if !strings.Contains(result, "type OutUser struct") { |
| 88 | t.Errorf("missing OutUser struct") |
| 89 | } |
| 90 | }, |
| 91 | }, |
| 92 | "empty nested object": { |
| 93 | input: `{"user": {}}`, |
| 94 | check: func(t *testing.T, result string) { |
| 95 | if !strings.Contains(result, "type Out struct") { |
| 96 | t.Errorf("missing Out struct") |
| 97 | } |
| 98 | if !strings.Contains(result, "type OutUser struct") { |
| 99 | t.Errorf("missing OutUser struct") |
| 100 | } |
| 101 | }, |
| 102 | }, |
| 103 | "array of object": { |
| 104 | input: `[{"name": "John"}, {"name": "Jane"}]`, |
| 105 | check: func(t *testing.T, result string) { |
| 106 | if !strings.Contains(result, "type Out []OutItem") { |
| 107 | t.Errorf("missing Out array type") |
| 108 | } |
| 109 | if !strings.Contains(result, "type OutItem struct") { |
| 110 | t.Errorf("missing OutItem struct") |
| 111 | } |
| 112 | }, |
| 113 | }, |
| 114 | "empty array": { |
| 115 | input: `{"items": []}`, |
| 116 | check: func(t *testing.T, result string) { |
| 117 | if !strings.Contains(result, "Items []any `json:\"items\"`") { |
| 118 | t.Errorf("missing Items field") |
| 119 | } |
| 120 | }, |
| 121 | }, |
| 122 | "null": { |
| 123 | input: `{"item": null}`, |
| 124 | check: func(t *testing.T, result string) { |
| 125 | if !strings.Contains(result, "Item any `json:\"item\"`") { |
| 126 | t.Errorf("missing Item field") |
| 127 | } |
| 128 | }, |
| 129 | }, |
| 130 | "numbers": { |
| 131 | input: `{"pos": 123, "neg": -321, "float": 420.69}`, |
| 132 | check: func(t *testing.T, result string) { |
| 133 | if !strings.Contains(result, "Pos int `json:\"pos\"`") { |
| 134 | t.Errorf("missing Pos field") |
| 135 | } |
| 136 | if !strings.Contains(result, "Neg int `json:\"neg\"`") { |
| 137 | t.Errorf("missing Neg field") |
| 138 | } |
| 139 | if !strings.Contains(result, "Float float64 `json:\"float\"`") { |
| 140 | t.Errorf("missing Float field") |
| 141 | } |
| 142 | }, |
| 143 | }, |
| 144 | } |
| 145 | |
| 146 | for tname, tt := range tests { |
| 147 | t.Run(tname, func(t *testing.T) { |
| 148 | sn := "Out" |
| 149 | if tt.structName != "" { |
| 150 | sn = tt.structName |
| 151 | } |
| 152 | |
| 153 | result, err := Transform(sn, tt.input, true) |
| 154 | assertEqualErr(t, tt.err, err) |
| 155 | if tt.check != nil { |
| 156 | tt.check(t, result) |
| 157 | } |
| 158 | }) |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | func assertEqualErr(t *testing.T, expected, actual error) { |
| 163 | t.Helper() |
| 164 | if expected == nil && actual == nil { |
| 165 | return |
| 166 | } |
| 167 | |
| 168 | if expected == nil || actual == nil { |
| 169 | t.Errorf("expected: %v, got: %v", expected, actual) |
| 170 | return |
| 171 | } |
| 172 | |
| 173 | if !errors.Is(actual, expected) { |
| 174 | t.Errorf("expected error: %v, got: %v", expected, actual) |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | func assertEqual[T any](t *testing.T, expected, actual T) { |
| 179 | t.Helper() |
| 180 | if !reflect.DeepEqual(expected, actual) { |
| 181 | t.Errorf("expected: %v, got: %v\n", expected, actual) |
| 182 | } |
| 183 | } |