Fixes gh-1417 Remove ConditionalOnProperty for supporting yaml (#1418)

Author: dlsrb6342

spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/propagation/SleuthTagPropagationAutoConfiguration.java

@@ -42,7 +42,6 @@ public class SleuthTagPropagationAutoConfiguration {
 	protected static class TagPropagationConfiguration {
 
 		@Bean
-		@ConditionalOnProperty("spring.sleuth.propagation.tag.whitelisted-keys")
 		public FinishedSpanHandler finishedSpanHandler(SleuthProperties sleuthProperties,
 				SleuthTagPropagationProperties tagPropagationProperties) {
 			return new TagPropagationFinishedSpanHandler(sleuthProperties,

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/propagation/SleuthTagPropagationAutoConfigurationTests.java

@@ -31,9 +31,10 @@ public class SleuthTagPropagationAutoConfigurationTests {
 					AutoConfigurations.of(SleuthTagPropagationAutoConfiguration.class));
 
 	@Test
-	public void shouldNotCreateHandler() {
-		this.contextRunner.run((context) -> {
-			assertThat(context).doesNotHaveBean(TagPropagationFinishedSpanHandler.class);
+	public void shouldCreateHandlerByDefault() {
+		this.contextRunner
+				.withUserConfiguration(TraceAutoConfiguration.class).run((context) -> {
+			assertThat(context).hasSingleBean(TagPropagationFinishedSpanHandler.class);
 		});
 	}
 
@@ -60,4 +61,14 @@ public void shouldCreateHandler() {
 				});
 	}
 
+	@Test
+	public void shouldCreateHandlerWithYml() {
+		this.contextRunner
+				.withPropertyValues(
+						"spring.profiles.active=tag-propagation")
+				.withUserConfiguration(TraceAutoConfiguration.class).run((context) -> {
+					assertThat(context)
+							.hasSingleBean(TagPropagationFinishedSpanHandler.class);
+				});
+	}
 }

spring-cloud-sleuth-core/src/test/resources/application-tag-propagation.yml

@@ -0,0 +1,3 @@
+spring.sleuth.propagation.tag.whitelisted-keys:
+  - foo
+  - bar