fix: support using delimiter in scope-enum

@commitlint/rules/src/scope-enum.test.ts

@@ -11,6 +11,7 @@ const messagesByScope = {
 	multiple: {
 		multiple: 'foo(bar,baz): qux',
 		multipleCommaSpace: 'foo(bar, baz): qux',
+		multipleSlash: 'foo(bar/baz): qux',
 	},
 	none: {
 		empty: 'foo: baz',
@@ -143,6 +144,16 @@ describe('Scope Enum Validation', () => {
 					expect(message).toEqual('scope must be one of [bar]');
 				});
 			});
+
+			test(`Succeeds with a 'multipleSlash' message when the scopes are included in enum`, async () => {
+				const [actual, message] = scopeEnum(
+					await parse(messages['multipleSlash']),
+					'always',
+					['bar/baz']
+				);
+				expect(actual).toBeTruthy();
+				expect(message).toEqual('scope must be one of [bar/baz]');
+			});
 		});
 	});
 
@@ -181,6 +192,16 @@ describe('Scope Enum Validation', () => {
 					expect(message).toEqual('scope must not be one of [bar, baz]');
 				});
 			});
+
+			test(`Fails with a 'multipleSlash' message when the scopes are included in enum`, async () => {
+				const [actual, message] = scopeEnum(
+					await parse(messages['multipleSlash']),
+					'never',
+					['bar/baz']
+				);
+				expect(actual).toBeFalsy();
+				expect(message).toEqual('scope must not be one of [bar/baz]');
+			});
 		});
 	});
 });

@commitlint/rules/src/scope-enum.ts

@@ -20,10 +20,10 @@ export const scopeEnum: SyncRule<string[]> = (
 	let isValid;
 
 	if (when === 'never') {
-		isValid = !messageScopes.some(isScopeInEnum);
+		isValid = !messageScopes.some(isScopeInEnum) && !isScopeInEnum(scope);
 		errorMessage.splice(1, 0, 'not');
 	} else {
-		isValid = messageScopes.every(isScopeInEnum);
+		isValid = messageScopes.every(isScopeInEnum) || isScopeInEnum(scope);
 	}
 
 	return [isValid, message(errorMessage)];