Validation should fail if required key is Go Zero Value for the corresponding type

[jawn-smith]

Here is what I am trying to do:

package main

import (
	"fmt"
	"strings"

	"github.com/xeipuuv/gojsonschema"
	"gopkg.in/yaml.v2"
)

func main() {
	yamlFile1 := `
test-string1: "foo"
test-string2: "bar"
`

	yamlFile2 := `
test-string1: "baz"
`

	schemaFile := `
{
  "$schema": "http://json-schema.org/draft/2020-12/schema",
  "$ref": "#/$defs/TestStruct",
  "$defs": {
    "TestStruct": {
      "properties": {
        "TestString1": {
          "type": "string"
        },
        "TestString2": {
          "type": "string"
        }
      },
      "additionalProperties": false,
      "type": "object",
      "required": [
        "TestString1",
        "TestString2"
      ]
    }
  }
}`
	type TestStruct struct {
		TestString1 string `yaml:"test-string1" json:"TestString1"`
		TestString2 string `yaml:"test-string2" json:"TestString2"`
	}

	var testStruct1 TestStruct
	yamlReader1 := strings.NewReader(yamlFile1)
	yaml.NewDecoder(yamlReader1).Decode(&testStruct1)

	var testStruct2 TestStruct
	yamlReader2 := strings.NewReader(yamlFile2)
	yaml.NewDecoder(yamlReader2).Decode(&testStruct2)

	sl := gojsonschema.NewSchemaLoader()
	loader1 := gojsonschema.NewStringLoader(schemaFile)
	sl.AddSchemas(loader1)

	testStructLoader1 := gojsonschema.NewGoLoader(testStruct1)
	testStructLoader2 := gojsonschema.NewGoLoader(testStruct2)

	schema, _ := sl.Compile(loader1)
	result, _ := schema.Validate(testStructLoader1)

	if result.Valid() {
		fmt.Println("testStruct1 successfully validated")
	} else {
		fmt.Println("testStruct1 FAILED validation")
	}

	result, _ = schema.Validate(testStructLoader2)

	if result.Valid() {
		fmt.Println("testStruct2 successfully validated")
	} else {
		fmt.Println("testStruct2 FAILED validation")
	}

}

In this example, the JSON schema requires both "TestString1" and "TestString2" to be present. It isn't present in one of the example YAML files, but it successfully validates anyway. Running this code yields:

testStruct1 successfully validated
testStruct2 successfully validated

Looking at the gojsonschema code, it only checks for if they key is present in the struct, rather than if the key has a non ZeroType value.