x.json2: refactor json tests (#16638)

vlib/x/json2/decode_struct_test.v

@@ -0,0 +1,60 @@
+import x.json2 as json
+
+type StringAlias = string
+type BoolAlias = bool
+type IntAlias = int
+
+type SumTypes = bool | int | string
+
+struct StructType[T] {
+mut:
+	val T
+}
+
+struct StructTypeOptional[T] {
+mut:
+	val ?T
+}
+
+struct StructTypePointer[T] {
+mut:
+	val &T
+}
+
+fn test_types() {
+	assert json.decode[StructType[string]]('{"val": ""}')!.val == ''
+	assert json.decode[StructType[string]]('{"val": "0"}')!.val == '0'
+	assert json.decode[StructType[string]]('{"val": "1"}')!.val == '1'
+	assert json.decode[StructType[string]]('{"val": "2"}')!.val == '2'
+	assert json.decode[StructType[string]]('{"val": 0}')!.val == '0'
+	assert json.decode[StructType[string]]('{"val": 1}')!.val == '1'
+	assert json.decode[StructType[string]]('{"val": 2}')!.val == '2'
+	assert json.decode[StructType[string]]('{"val": "true"}')!.val == 'true'
+	assert json.decode[StructType[string]]('{"val": "false"}')!.val == 'false'
+	assert json.decode[StructType[string]]('{"val": true}')!.val == 'true'
+	assert json.decode[StructType[string]]('{"val": false}')!.val == 'false'
+
+	assert json.decode[StructType[bool]]('{"val": ""}')!.val == false
+	assert json.decode[StructType[bool]]('{"val": "0"}')!.val == false
+	assert json.decode[StructType[bool]]('{"val": "1"}')!.val == true
+	assert json.decode[StructType[bool]]('{"val": "2"}')!.val == true
+	assert json.decode[StructType[bool]]('{"val": 0}')!.val == false
+	assert json.decode[StructType[bool]]('{"val": 1}')!.val == true
+	assert json.decode[StructType[bool]]('{"val": 2}')!.val == true
+	assert json.decode[StructType[bool]]('{"val": "true"}')!.val == true
+	assert json.decode[StructType[bool]]('{"val": "false"}')!.val == false
+	assert json.decode[StructType[bool]]('{"val": true}')!.val == true
+	assert json.decode[StructType[bool]]('{"val": false}')!.val == false
+
+	assert json.decode[StructType[int]]('{"val": ""}')!.val == 0
+	assert json.decode[StructType[int]]('{"val": "0"}')!.val == 0
+	assert json.decode[StructType[int]]('{"val": "1"}')!.val == 1
+	assert json.decode[StructType[int]]('{"val": "2"}')!.val == 2
+	assert json.decode[StructType[int]]('{"val": 0}')!.val == 0
+	assert json.decode[StructType[int]]('{"val": 1}')!.val == 1
+	assert json.decode[StructType[int]]('{"val": 2}')!.val == 2
+	assert json.decode[StructType[int]]('{"val": "true"}')!.val == 1
+	assert json.decode[StructType[int]]('{"val": "false"}')!.val == 0
+	assert json.decode[StructType[int]]('{"val": true}')!.val == 1
+	assert json.decode[StructType[int]]('{"val": false}')!.val == 0
+}