add test to demonstrate

Author: jgentner1

springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/app157/Bar.java

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+package test.org.springdoc.api.app157;
+
+/**
+ * A class without a String in it
+ */
+public class Bar {
+  private Object child;
+
+  public Object getChild() {
+    return this.child;
+  }
+}

springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/app157/Foo.java

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+package test.org.springdoc.api.app157;
+
+/**
+ * A class with a String in it
+ */
+public class Foo {
+  private String child;
+
+  public String getChild() {
+    return this.child;
+  }
+}

springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/app157/HelloController.java

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+/*
+ *
+ *  * Copyright 2019-2020 the original author or authors.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  *      https://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package test.org.springdoc.api.app157;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * Put Foo and Bar in the schema's components, make sure there is an ignored wrapper
+ * ({@code ResponseEntity}).
+ */
+@RestController
+public class HelloController {
+
+	@GetMapping( "/foo")
+	public ResponseEntity<Foo> getFoo() {
+		return new ResponseEntity<Foo>(HttpStatus.OK);
+	}
+
+	@GetMapping( "/bar")
+	public ResponseEntity<Bar> getBar() {
+		return new ResponseEntity<Bar>(HttpStatus.OK);
+	}
+
+
+}

springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/app157/SpringDocApp157Test.java

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+package test.org.springdoc.api.app157;
+
+import io.swagger.v3.core.converter.ModelConverters;
+import io.swagger.v3.core.util.Json;
+import org.junit.jupiter.api.Test;
+import org.springdoc.core.Constants;
+import org.springdoc.core.converters.ModelConverterRegistrar;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.test.web.servlet.MvcResult;
+import test.org.springdoc.api.AbstractSpringDocTest;
+
+import java.util.List;
+
+import static org.hamcrest.Matchers.*;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * This test is to make sure that a new model converter can access the parent of a type, even if
+ * the type is enclosed in an ignored wrapper.  We test this by setting up a model converter which
+ * adds "stringy" to the "required" property of a schema's parent, when the sub schema is a String.
+ */
+public class SpringDocApp157Test extends AbstractSpringDocTest {
+
+  @SpringBootApplication
+  static class SpringBootApp {}
+
+  @Test
+  public void testApp() throws Exception {
+    // Not sure why the converter isn't registered automatically. Register it here.
+    new ModelConverterRegistrar(List.of(new StringyConverter()));
+    mockMvc.perform(get(Constants.DEFAULT_API_DOCS_URL))
+        .andExpect(status().isOk())
+        .andExpect(jsonPath("$.openapi", is("3.0.1")))
+        .andExpect(jsonPath("$.components.schemas.Foo.required", is(List.of("stringy"))))
+        .andExpect(jsonPath("$.components.schemas.Bar", not(hasProperty("required"))));
+  }
+}

springdoc-openapi-webmvc-core/src/test/java/test/org/springdoc/api/app157/StringyConverter.java

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+package test.org.springdoc.api.app157;
+
+import com.fasterxml.jackson.databind.JavaType;
+import io.swagger.v3.core.converter.AnnotatedType;
+import io.swagger.v3.core.converter.ModelConverter;
+import io.swagger.v3.core.converter.ModelConverterContext;
+import io.swagger.v3.core.util.Json;
+import io.swagger.v3.oas.models.media.Schema;
+
+import java.util.Iterator;
+
+public class StringyConverter implements ModelConverter {
+
+  @Override
+  public Schema resolve(AnnotatedType type, ModelConverterContext context,
+    Iterator<ModelConverter> chain) {
+
+    JavaType javaType = Json.mapper().constructType(type.getType());
+
+    if (javaType.getRawClass().equals(String.class)) {
+      type.getParent().addRequiredItem("stringy");
+    }
+    return chain.next().resolve(type, context, chain);
+  }
+}