Support Customizing Observation Conventions

Closes gh-12534

core/src/test/java/org/springframework/security/authentication/ObservationAuthenticationManagerTests.java

@@ -93,4 +93,9 @@ public class ObservationAuthenticationManagerTests {
 		assertThat(context.getAuthenticationResult()).isNull();
 	}
 
+	@Test
+	void conventionSetterThrowsWhenNull() {
+		assertThatExceptionOfType(IllegalArgumentException.class)
+				.isThrownBy(() -> this.tested.setConvention(null));
+	}
 }

core/src/test/java/org/springframework/security/authentication/ObservationReactiveAuthenticationManagerTests.java

@@ -96,4 +96,10 @@ public class ObservationReactiveAuthenticationManagerTests {
 		assertThat(context.getAuthenticationResult()).isNull();
 	}
 
+	@Test
+	void conventionSetterThrowsWhenNull() {
+		assertThatExceptionOfType(IllegalArgumentException.class)
+				.isThrownBy(() -> this.tested.setConvention(null));
+	}
+
 }

core/src/test/java/org/springframework/security/authorization/ObservationAuthorizationManagerTests.java

@@ -118,4 +118,9 @@ public class ObservationAuthorizationManagerTests {
 		assertThat(context.getDecision()).isEqualTo(this.grant);
 	}
 
+	@Test
+	void conventionSetterThrowsWhenNull() {
+		assertThatExceptionOfType(IllegalArgumentException.class)
+				.isThrownBy(() -> this.tested.setConvention(null));
+	}
 }

core/src/test/java/org/springframework/security/authorization/ObservationReactiveAuthorizationManagerTests.java

@@ -117,4 +117,9 @@ public class ObservationReactiveAuthorizationManagerTests {
 		assertThat(context.getDecision()).isEqualTo(this.grant);
 	}
 
+	@Test
+	void conventionSetterThrowsWhenNull() {
+		assertThatExceptionOfType(IllegalArgumentException.class)
+				.isThrownBy(() -> this.tested.setConvention(null));
+	}
 }