Improve missing cassette errors (DataDog#280)

Author: NouemanKHAL

features/support/vcr.ts

@@ -9,6 +9,7 @@ import { After, Before } from "@cucumber/cucumber";
 import { World } from "./world";
 import { ITestCaseHookParameter } from "@cucumber/cucumber/lib/support_code_library_builder/types";
 import { MODES } from "@pollyjs/utils";
+import { FetchError } from "node-fetch";
 
 Polly.register(NodeHttpAdapter);
 Polly.register(FSPersister);
@@ -70,9 +71,18 @@ Before(function (
     ) {
       fs.mkdirSync(path.dirname(frozen), { recursive: true });
       fs.writeFileSync(frozen, JSON.stringify(date));
+    } else if (this.polly?.mode == MODES.REPLAY) {
+      throw new Error(`Time file '${frozen}' not found: create one setting \`RECORD=true\` or ignore it using \`RECORD=none\``);
     }
   }
 
+  const cassette = path.join(recordingsDir, this.polly?.recordingId, "recording.har")
+  const cassetteExists = fs.existsSync(cassette)
+
+  if (!cassetteExists && this.polly?.mode == MODES.REPLAY) {
+    throw new Error(`Cassette '${cassette}' not found: create one setting \`RECORD=true\` or ignore it using \`RECORD=none\``);
+  }
+
   const now = date.getTime() / 1000;
   const name = pickle.name?.replace(/[^A-Za-z0-9]+/g, "_").substr(0, 100);
   const prefix =