Disallow extra properties in rule options (#359)

Author: andreww2012

rules/assertion-arguments.js

@@ -399,6 +399,7 @@ const schema = [{
 			default: undefined,
 		},
 	},
+	additionalProperties: false,
 }];
 
 module.exports = {

rules/no-ignored-test-files.js

@@ -60,6 +60,7 @@ const schema = [{
 			type: 'array',
 		},
 	},
+	additionalProperties: false,
 }];
 
 module.exports = {

rules/no-import-test-files.js

@@ -72,6 +72,7 @@ const schema = [{
 			type: 'array',
 		},
 	},
+	additionalProperties: false,
 }];
 
 module.exports = {

rules/test-title-format.js

@@ -45,6 +45,7 @@ const schema = [
 				default: undefined,
 			},
 		},
+		additionalProperties: false,
 	},
 ];