skip test if in node

sdk/core/core-tracing/test/cache.spec.ts

@@ -3,20 +3,23 @@
 
 import assert from "assert";
 import * as fs from "fs";
+import { Context } from "mocha";
 import * as path from "path";
 
 const validOpenTelemetryVersions = ["0.20.0"];
 
 describe("cache", () => {
-  const packageJson = JSON.parse(
-    fs.readFileSync(path.join(__dirname, "../package.json"), { encoding: "utf8" })
-  );
-
-  it("ensure current @opentelemetry/api has been validated", () => {
+  it("ensure current @opentelemetry/api has been validated", function(this: Context) {
+    if (!fs) {
+      this.skip();
+    }
     // This test ensures that we make a conscious and deliberate decision whether two tracers are compatible.
     // When upgrading our @opentelemetry/api version, if the changes to the _tracer_ are incompatible we should
     // Update GLOBAL_TRACER_SYMBOL to be unique by incrementing the version and remove the existing entries in `validOpenTelemetryVersions`. Otherwise we can share a tracer cache.
     // When finished, you can add this version to the `validOpenTelemetryVersions` array.
+    const packageJson = JSON.parse(
+      fs.readFileSync(path.join(__dirname, "../package.json"), { encoding: "utf8" })
+    );
     assert.ok(
       validOpenTelemetryVersions.includes(packageJson["dependencies"]["@opentelemetry/api"]),
       "Detected new version of @opentelemetry/api. Please ensure compatibility with current versions or bump the cache version to ensure uniqueness, then add it to the `validOpenTelemetryVersions` list."