Test `JsonGenerator`

core-groovy-modules/core-groovy/src/test/groovy/com/baeldung/json/JsonParserTest.groovy

@@ -1,5 +1,6 @@
 package com.baeldung.json
 
+import groovy.json.JsonGenerator
 import spock.lang.Specification
 
 import java.text.SimpleDateFormat
@@ -8,20 +9,42 @@ class JsonParserTest extends Specification {
 
     JsonParser jsonParser
 
-    void setup () {
+    void setup() {
         jsonParser = new JsonParser()
     }
 
-    def 'Should parse to Account given Json String' () {
+    def 'Should parse to Account given Json String'() {
         given:
-            def json = '{"id":"1234","value":15.6}'
+        def json = '{"id":"1234","value":15.6}'
+
         when:
-            def account = jsonParser.toObject(json)
+        def account = jsonParser.toObject(json)
+
         then:
-            account
+        account
-            account instanceof Account
+        account instanceof Account
-            account.id == '1234'
+        account.id == '1234'
-            account.value == 15.6
+        account.value == 15.6
+    }
+
+    def 'Should format date and exclude value field'() {
+        given:
+        def account = new Account(
+                id: '123',
+                value: 15.6,
+                createdAt: new SimpleDateFormat('MM/dd/yyyy').parse('14/01/2023')
+        )
+
+        def jsonGenerator = new JsonGenerator.Options()
+                .dateFormat('MM/dd/yyyy')
+                .excludeFieldsByName('value')
+                .build()
+
+        when:
+        def accountToJson = jsonGenerator.toJson(account)
+
+        then:
+        accountToJson == '{"createdAt":"01/31/2024","id":"123"}'
     }
 
     /*def 'Should parse to Account given Json String with date property' () {
@@ -52,15 +75,20 @@ class JsonParserTest extends Specification {
             json == '{"value":15.6,"createdAt":"2018-01-01T00:00:00+0000","id":"123"}'
     }*/
 
-    def 'Should prettify given a json string' () {
+    def 'Should prettify given a json string'() {
         given:
-            String json = '{"value":15.6,"createdAt":"01/01/2018","id":"123456"}'
+        String json = '{"value":15.6,"createdAt":"01/01/2018","id":"123456"}'
+
         when:
-            def jsonPretty = jsonParser.prettyfy(json)
+        def jsonPretty = jsonParser.prettyfy(json)
+
         then:
-            jsonPretty
+        jsonPretty
-            jsonPretty == '{\n    "value": 15.6,\n    "createdAt": "01/01/2018",\n    "id": "123456"\n}'
+        jsonPretty == '''\
+{
+    "value": 15.6,
+    "createdAt": "01/01/2018",
+    "id": "123456"
+}'''
     }
-
-
 }