Polish new response fields test and add equivalent for request fields

See gh-399

spring-restdocs-core/src/test/java/org/springframework/restdocs/payload/RequestFieldsSnippetTests.java

@@ -368,6 +368,20 @@ public class RequestFieldsSnippetTests extends AbstractSnippetTests {
 										.build());
 	}
 
+	@Test
+	public void requestWithArrayContainingFieldThatIsSometimesNull() throws IOException {
+		this.snippets.expectRequestFields()
+				.withContents(tableWithHeader("Path", "Type", "Description")
+						.row("`assets[].name`", "`String`", "one"));
+		new RequestFieldsSnippet(Arrays.asList(fieldWithPath("assets[].name")
+				.description("one").type(JsonFieldType.STRING)))
+						.document(this.operationBuilder.request("http://localhost")
+								.content("{\"assets\": [" + "{\"name\": \"sample1\"}, "
+										+ "{\"name\": null}, "
+										+ "{\"name\": \"sample2\"}]}")
+								.build());
+	}
+
 	private String escapeIfNecessary(String input) {
 		if (this.templateFormat.equals(TemplateFormats.markdown())) {
 			return input;

spring-restdocs-core/src/test/java/org/springframework/restdocs/payload/ResponseFieldsSnippetTests.java

@@ -379,22 +379,19 @@ public class ResponseFieldsSnippetTests extends AbstractSnippetTests {
 	}
 
 	@Test
-	public void responseWithSomeNullOcurrencesOfAField() throws IOException {
+	public void responseWithArrayContainingFieldThatIsSometimesNull() throws IOException {
 		this.snippets.expectResponseFields()
 				.withContents(tableWithHeader("Path", "Type", "Description")
 						.row("`assets[].name`", "`String`", "one"));
-		new ResponseFieldsSnippet(Arrays.asList(
-				fieldWithPath("assets[].name").description("one")))
-				.document(this.operationBuilder.response()
-						.content(
-								"{\"assets\": [" +
-										"{\"name\": \"sample1\"}, " +
-										"{\"name\": null}, " +
-										"{\"name\": \"sample2\"}]}")
-						.build());
+		new ResponseFieldsSnippet(Arrays.asList(fieldWithPath("assets[].name")
+				.description("one").type(JsonFieldType.STRING)))
+						.document(this.operationBuilder.response()
+								.content("{\"assets\": [" + "{\"name\": \"sample1\"}, "
+										+ "{\"name\": null}, "
+										+ "{\"name\": \"sample2\"}]}")
+								.build());
 	}
 
-
 	private String escapeIfNecessary(String input) {
 		if (this.templateFormat.equals(TemplateFormats.markdown())) {
 			return input;