Remove assumptions about ordering when comparing JSON in tests

See gh-30514

spring-boot-project/spring-boot-autoconfigure/build.gradle

@@ -233,6 +233,7 @@ dependencies {
 	testImplementation("org.junit.jupiter:junit-jupiter")
 	testImplementation("org.mockito:mockito-core")
 	testImplementation("org.mockito:mockito-junit-jupiter")
+	testImplementation("org.skyscreamer:jsonassert")
 	testImplementation("org.springframework:spring-test")
 	testImplementation("org.springframework.kafka:spring-kafka-test")
 	testImplementation("org.springframework.security:spring-security-test")

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/gson/GsonAutoConfigurationTests.java

@@ -29,6 +29,7 @@ import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.LongSerializationPolicy;
 import org.junit.jupiter.api.Test;
+import org.skyscreamer.jsonassert.JSONAssert;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
@@ -150,7 +151,7 @@ class GsonAutoConfigurationTests {
 	void customGsonBuilder() {
 		this.contextRunner.withUserConfiguration(GsonBuilderConfig.class).run((context) -> {
 			Gson gson = context.getBean(Gson.class);
-			assertThat(gson.toJson(new DataObject())).isEqualTo("{\"data\":1,\"owner\":null}");
+			JSONAssert.assertEquals(gson.toJson(new DataObject()), "{\"data\":1,\"owner\":null}", false);
 		});
 	}