Allowed named classes and functions as BlockNames

packages/jest-jasmine2/src/jasmine/Suite.js

@@ -38,7 +38,7 @@ import expectationResultFactory from '../expectation_result_factory';
 export default function Suite(attrs: Object) {
   this.id = attrs.id;
   this.parentSuite = attrs.parentSuite;
-  this.description = attrs.description;
+  this.description = convertDescriptorToString(attrs.description);
   this.throwOnExpectationFailure = !!attrs.throwOnExpectationFailure;
 
   this.beforeFns = [];
@@ -181,6 +181,25 @@ Suite.prototype.addExpectationResult = function() {
   }
 };
 
+function convertDescriptorToString(descriptor) {
+  if (typeof descriptor === 'string' || descriptor === undefined) {
+    return descriptor;
+  }
+
+  if (descriptor.name !== undefined) {
+    return descriptor.name;
+  }
+
+  const stringified = descriptor.toString();
+  const typeDescriptorMatch = stringified.match(/class|function/);
+  const indexOfNameSpace =
+    typeDescriptorMatch.index + typeDescriptorMatch[0].length;
+  const indexOfNameAfterSpace = stringified.search(/\(|\{/, indexOfNameSpace);
+  const name = stringified.substring(indexOfNameSpace, indexOfNameAfterSpace);
+
+  return name.trim();
+}
+
 function isAfterAll(children) {
   return children && children[0].result.status;
 }

types/Circus.js

@@ -9,7 +9,7 @@
 
 export type DoneFn = (reason?: string | Error) => void;
 export type BlockFn = () => void;
-export type BlockName = string;
+export type BlockName = string | Function;
 export type BlockMode = void | 'skip' | 'only';
 export type TestMode = BlockMode;
 export type TestName = string;