Add tests for nested validation with nullable

blackbox-test/src/test/java/example/avaje/nested/AContactWithNullable.java

@@ -0,0 +1,25 @@
+package example.avaje.nested;
+
+import io.avaje.lang.Nullable;
+import io.avaje.validation.ValidPojo;
+import io.avaje.validation.constraints.NotNull;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+@ValidPojo
+public class AContactWithNullable {
+
+  @NotBlank
+  public String firstName;
+  @Size(max = 5)
+  public String lastName;
+
+  @Nullable
+  public AAddress address;
+
+  public AContactWithNullable(String firstName, String lastName) {
+    this.firstName = firstName;
+    this.lastName = lastName;
+  }
+
+}

blackbox-test/src/test/java/example/avaje/nested/ANestedTest.java

@@ -13,7 +13,7 @@ class ANestedTest {
   final Validator validator = Validator.builder().build();
 
   @Test
-  void valid() {
+  void validateNested() {
     var contact = new AContact("Rob", "TooLargeForHere");
     contact.address = new AAddress("", "TooBigHere", -1);
 

blackbox-test/src/test/java/example/avaje/nested/ANestedWithNullableTest.java

@@ -0,0 +1,83 @@
+package example.avaje.nested;
+
+import io.avaje.validation.ConstraintViolationException;
+import io.avaje.validation.Validator;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ANestedWithNullableTest {
+
+  final Validator validator = Validator.builder().build();
+
+  @Test
+  void validateNestedSkipNullAddress() {
+    var contact = new AContactWithNullable("Rob", "TooLargeForHere");
+    contact.address = null;
+
+    try {
+      validator.validate(contact);
+    } catch (ConstraintViolationException e) {
+      var violations = new ArrayList<>(e.violations());
+      assertThat(violations).hasSize(1);
+
+      var v0 = violations.get(0);
+      assertThat(v0.path()).isEqualTo("");
+      assertThat(v0.propertyName()).isEqualTo("lastName");
+      assertThat(v0.message()).isEqualTo("size must be between 0 and 5");
+    }
+  }
+
+  @Test
+  void validateNestedAddress() {
+    var contact = new AContactWithNullable("Rob", "TooLargeForHere");
+    contact.address = new AAddress("line1", "ok", 12);
+
+    try {
+      validator.validate(contact);
+    } catch (ConstraintViolationException e) {
+      var violations = new ArrayList<>(e.violations());
+      assertThat(violations).hasSize(1);
+
+      var v0 = violations.get(0);
+      assertThat(v0.path()).isEqualTo("");
+      assertThat(v0.propertyName()).isEqualTo("lastName");
+      assertThat(v0.message()).isEqualTo("size must be between 0 and 5");
+    }
+  }
+
+  @Test
+  void validateNested() {
+    var contact = new AContactWithNullable("Rob", "TooLargeForHere");
+    contact.address = new AAddress("", "TooBigHere", -1);
+
+    try {
+      validator.validate(contact);
+    } catch (ConstraintViolationException e) {
+      var violations = new ArrayList<>(e.violations());
+      assertThat(violations).hasSize(4);
+
+      var v0 = violations.get(0);
+      assertThat(v0.path()).isEqualTo("");
+      assertThat(v0.propertyName()).isEqualTo("lastName");
+      assertThat(v0.message()).isEqualTo("size must be between 0 and 5");
+
+      var v1 = violations.get(1);
+      assertThat(v1.path()).isEqualTo("address");
+      assertThat(v1.propertyName()).isEqualTo("line1");
+      assertThat(v1.message()).isEqualTo("must not be blank");
+
+      var v2 = violations.get(2);
+      assertThat(v2.path()).isEqualTo("address");
+      assertThat(v2.propertyName()).isEqualTo("line2");
+      assertThat(v2.message()).isEqualTo("size must be between 0 and 4");
+
+      var v3 = violations.get(3);
+      assertThat(v3.path()).isEqualTo("address");
+      assertThat(v3.propertyName()).isEqualTo("longValue");
+      assertThat(v3.message()).isEqualTo("must be greater than 0");
+    }
+  }
+}