Add relaxed names for enum test

Add an extra test that demonstrate the use of relaxed binding for Enum
when it is used as a map key.

See gh-2465

spring-boot/src/test/java/org/springframework/boot/bind/RelaxedDataBinderTests.java

@@ -334,6 +334,15 @@ public class RelaxedDataBinderTests {
 		assertEquals("123", target.getNested().get(Bingo.THAT));
 	}
 
+	@Test
+	public void testBindNestedMapOfEnumRelaxedNames() throws Exception {
+		this.conversionService = new DefaultConversionService();
+		TargetWithNestedMapOfEnum target = new TargetWithNestedMapOfEnum();
+		bind(target, "nested.the-other: bar\n" + "nested.that_other: 123");
+		assertEquals("bar", target.getNested().get(Bingo.THE_OTHER));
+		assertEquals("123", target.getNested().get(Bingo.THAT_OTHER));
+	}
+
 	@Test
 	public void testBindNestedMapBracketReferenced() throws Exception {
 		TargetWithNestedMap target = new TargetWithNestedMap();
@@ -969,7 +978,7 @@ public class RelaxedDataBinderTests {
 	}
 
 	enum Bingo {
-		THIS, or, THAT, THE_OTHER
+		THIS, or, THAT, THE_OTHER, THAT_OTHER
 	}
 
 	public static class ValidatedTarget {