Jackson tester example

spring-web-lab/README.md

@@ -2,4 +2,5 @@
 
 ## Sources 🔗
 
-* [Java Senior Quiz 🧩](https://youtube.com/playlist?list=PLO5muTI694A5yRrEDNY1czqEUVbYHG_AH&si=KteWFowVcOSTQ8F-)
+* [Java Senior Quiz 🧩](https://youtube.com/playlist?list=PLO5muTI694A5yRrEDNY1czqEUVbYHG_AH&si=KteWFowVcOSTQ8F-)
+* [Action Jackson! Effective JSON processing in Spring Boot Applications by Joris Kuipers @ Spring I/O](https://youtu.be/BhiF6e24l5k?si=IxS0X6FtgfWzdP-c)

spring-web-lab/src/main/resources/application.yml

@@ -6,4 +6,8 @@
 
 #logging:
 #  level:
-#    org.springframework.boot.actuate: DEBUG
+#    org.springframework.boot.actuate: DEBUG
+
+#spring:
+#  jackson:
+#    default-property-inclusion: NON_NULL

spring-web-lab/src/test/java/pl/mperor/lab/spring/jackson/JacksonTest.java

@@ -0,0 +1,47 @@
+package pl.mperor.lab.spring.jackson;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
+import org.springframework.boot.test.json.JacksonTester;
+import org.springframework.boot.test.json.JsonContent;
+
+import java.io.IOException;
+import java.util.Map;
+
+@JsonTest
+public class JacksonTest {
+
+    @Autowired
+    private JacksonTester<Sample> sampleTester;
+    @Autowired
+    private JacksonTester<Map<String, Sample>> wrappedTester;
+
+    record Sample(int integer, String string) {}
+
+    @Test
+    void testSampleMarshalling() throws IOException {
+        var sample = new Sample(1, "Text");
+        JsonContent<Sample> content = sampleTester.write(sample);
+        Assertions.assertThat(content).isEqualToJson("""
+                {
+                    "integer" : 1,
+                    "string" : "Text"
+                }
+                """
+        );
+
+        var wrapped = Map.of("sample", sample);
+        Assertions.assertThat(wrappedTester.write(wrapped)).isEqualToJson("""
+                {
+                    "sample" : {
+                       "integer" : 1,
+                        "string" : "Text"
+                    }
+                }
+                """
+        );
+    }
+
+}