Add some tests for JSON mime types in rest endpoints

spring-cloud-function-web/src/test/java/org/springframework/cloud/function/web/RestApplicationTests.java

@@ -16,9 +16,12 @@
 package org.springframework.cloud.function.web;
 
 import java.net.URI;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -58,6 +61,16 @@ public class RestApplicationTests {
 						String.class).getBody()).isEqualTo(sse("foo", "bar"));
 	}
 
+	@Test
+	public void wordsJson() throws Exception {
+		assertThat(rest
+				.exchange(
+						RequestEntity.get(new URI("http://localhost:" + port + "/words"))
+								.accept(MediaType.APPLICATION_JSON).build(),
+						String.class)
+				.getBody()).isEqualTo("[\"foo\",\"bar\"]");
+	}
+
 	@Test
 	public void words() throws Exception {
 		assertThat(rest.exchange(
@@ -71,6 +84,32 @@ public class RestApplicationTests {
 				"foo\nbar", String.class)).isEqualTo("[FOO][BAR]");
 	}
 
+	@Test
+	@Ignore("Not working even though the JSON stream is")
+	// Not working because we convert the JSON to objects in
+	// FunctionExtractingFunctionCatalog, so all we need from Spring Reactive is a String,
+	// and the StringDecoder splits on newlines
+	public void uppercaseJsonArray() throws Exception {
+		assertThat(rest
+				.exchange(
+						RequestEntity.post(new URI("http://localhost:" + port + "/maps"))
+								.contentType(MediaType.APPLICATION_JSON)
+								.body("[{\"value\":\"foo\"},{\"value\":\"bar\"}]"),
+						String.class)
+				.getBody()).isEqualTo("{\"value\":\"FOO\"}{\"value\":\"BAR\"}");
+	}
+
+	@Test
+	public void uppercaseJsonStream() throws Exception {
+		assertThat(rest
+				.exchange(
+						RequestEntity.post(new URI("http://localhost:" + port + "/maps"))
+								.contentType(MediaType.APPLICATION_JSON)
+								.body("{\"value\":\"foo\"}\n{\"value\":\"bar\"}"),
+						String.class)
+				.getBody()).isEqualTo("{\"value\":\"FOO\"}{\"value\":\"BAR\"}");
+	}
+
 	@Test
 	public void uppercaseSSE() throws Exception {
 		assertThat(rest.exchange(
@@ -92,6 +131,14 @@ public class RestApplicationTests {
 			return flux -> flux.map(value -> "[" + value.trim().toUpperCase() + "]");
 		}
 
+		@Bean
+		public Function<Flux<HashMap<String, String>>, Flux<Map<String, String>>> maps() {
+			return flux -> flux.map(value -> {
+				value.put("value", value.get("value").trim().toUpperCase());
+				return value;
+			});
+		}
+
 		@Bean
 		public Supplier<Flux<String>> words() {
 			return () -> Flux.fromArray(new String[] { "foo", "bar" });