fix: ContainerId not detected post version 0.2.2 (#2270)

* ?? only checks for null and undefined

* added unit test to cover the fix

* added unit test to cover the fix

* lint fixes

* lint fixes - line too long

Author: abhee11

detectors/node/opentelemetry-resource-detector-container/src/detectors/ContainerDetector.ts

@@ -108,7 +108,7 @@ export class ContainerDetector implements Detector {
   private async _getContainerId(): Promise<string | undefined> {
     try {
       return (
-        (await this._getContainerIdV1()) ?? (await this._getContainerIdV2())
+        (await this._getContainerIdV1()) || (await this._getContainerIdV2())
       );
     } catch (e) {
       if (e instanceof Error) {

detectors/node/opentelemetry-resource-detector-container/test/ContainerDetector.test.ts

@@ -94,6 +94,16 @@ describe('ContainerDetector', () => {
       assert.ok(resource);
     });
 
+    it('should return a correctCgroupV2Data resource with v1Detector returns empty string ', async () => {
+      readStub = sinon.stub(ContainerDetector, 'readFileAsync' as any);
+      sinon.stub(containerDetector, '_getContainerIdV1' as any).resolves('');
+      sinon
+        .stub(containerDetector, '_getContainerIdV2' as any)
+        .resolves(correctCgroupV2Data);
+      const containerId = await containerDetector['_getContainerId']();
+      assert.strictEqual(containerId, correctCgroupV2Data);
+    });
+
     it('should return a resource without attribute container.id when cgroup file does not contain valid Container ID', async () => {
       readStub = sinon
         .stub(ContainerDetector, 'readFileAsync' as any)