Add spy.named() and stub.named() (#29469)

types/sinon/index.d.ts

@@ -295,6 +295,11 @@ declare namespace Sinon {
          * Returns an Array with all callbacks return values in the order they were called, if no error is thrown.
          */
         invokeCallback(...args: any[]): void;
+        /**
+         * Set the displayName of the spy or stub.
+         * @param name
+         */
+        named(name: string): SinonSpy;
         /**
          * Returns the nth call.
          * Accessing individual calls helps with more detailed behavior verification when the spy is called more than once.
@@ -530,6 +535,11 @@ declare namespace Sinon {
          * @param val
          */
         value(val: any): SinonStub;
+        /**
+         * Set the displayName of the spy or stub.
+         * @param name
+         */
+        named(name: string): SinonStub;
         /**
          * Similar to callsArg.
          * Causes the stub to call the first callback it receives with the provided arguments (if any).

types/sinon/sinon-tests.ts

@@ -296,7 +296,7 @@ function testSpy() {
     const instance = new obj();
 
     let spy = sinon.spy();
-    const spyTwo = sinon.spy();
+    const spyTwo = sinon.spy().named('spyTwo');
 
     spy = sinon.spy(fn);
     spy = sinon.spy(instance, 'foo');
@@ -386,7 +386,7 @@ function testStub() {
     const instance = new obj();
 
     let stub = sinon.stub();
-    stub = sinon.stub(instance, 'foo');
+    stub = sinon.stub(instance, 'foo').named('namedStub');
 
     const spy: sinon.SinonSpy = stub;