add hasRef (#419)

* add hasRef attribute

* add test to the hasRef feature

* Run Prettier

* Cleanup and add conditional for non-Node environments

Co-authored-by: Carl-Erik Kopseng <carlerik@gmail.com>

src/fake-timers-src.js

@@ -585,12 +585,18 @@ function withGlobal(_global) {
 
         if (addTimerReturnsObject) {
             const res = {
+                refed: true,
                 ref: function () {
+                    this.refed = true;
                     return res;
                 },
                 unref: function () {
+                    this.refed = false;
                     return res;
                 },
+                hasRef: function () {
+                    return this.refed;
+                },
                 refresh: function () {
                     clearTimeout(timer.id);
                     const args = [timer.func, timer.delay].concat(timer.args);

test/fake-timers-test.js

@@ -69,7 +69,6 @@ describe("issue #59", function () {
         clock.uninstall();
     });
 });
-
 describe("issue #73", function () {
     it("should install with date object", function () {
         const date = new Date("2015-09-25");
@@ -4834,6 +4833,7 @@ describe("#368 - timeout.refresh setTimeout arguments", function () {
             this.skip();
         }
     });
+
     it("should forward  arguments passed to setTimeout", function () {
         const clock = FakeTimers.install();
         const stub = sinon.stub();
@@ -5234,3 +5234,56 @@ describe("loop limit stack trace", function () {
         });
     });
 });
+
+describe("Node Timer: ref(), unref(),hasRef()", function () {
+    let clock;
+
+    before(function () {
+        if (!addTimerReturnsObject) {
+            this.skip();
+        }
+        clock = FakeTimers.install();
+    });
+
+    afterEach(function () {
+        clock.uninstall();
+    });
+
+    it("should return the ref status as true after initiation", function () {
+        const stub = sinon.stub();
+        const refStatusForTimeout = clock.setTimeout(stub, 0).hasRef();
+        const refStatusForInterval = clock.setInterval(stub, 0).hasRef();
+        assert.isTrue(refStatusForTimeout);
+        assert.isTrue(refStatusForInterval);
+        clock.uninstall();
+    });
+
+    it("should return the ref status as false after using unref", function () {
+        const stub = sinon.stub();
+        const refStatusForTimeout = clock.setTimeout(stub, 0).unref().hasRef();
+        const refStatusForInterval = clock
+            .setInterval(stub, 0)
+            .unref()
+            .hasRef();
+        assert.isFalse(refStatusForInterval);
+        assert.isFalse(refStatusForTimeout);
+        clock.uninstall();
+    });
+
+    it("should return the ref status as true after using unref and then ref ", function () {
+        const stub = sinon.stub();
+        const refStatusForTimeout = clock
+            .setTimeout(stub, 0)
+            .unref()
+            .ref()
+            .hasRef();
+        const refStatusForInterval = clock
+            .setInterval(stub, 0)
+            .unref()
+            .ref()
+            .hasRef();
+        assert.isTrue(refStatusForInterval);
+        assert.isTrue(refStatusForTimeout);
+        clock.uninstall();
+    });
+});