Add integration test

tests/039_worker_deno_ns.test

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+args: run --reload tests/039_worker_deno_ns.ts
+output: tests/039_worker_deno_ns.ts.out

tests/039_worker_deno_ns.ts

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+const w1 = new Worker("./tests/039_worker_deno_ns/has_ns.ts");
+const w2 = new Worker("./tests/039_worker_deno_ns/no_ns.ts", {
+  deno: { noDenoNamespace: true }
+});
+let w1MsgCount = 0;
+let w2MsgCount = 0;
+w1.onmessage = (msg): void => {
+  console.log(msg.data);
+  w1MsgCount++;
+  if (w1MsgCount === 1) {
+    w1.postMessage("CONTINUE");
+  } else {
+    w2.postMessage("START");
+  }
+};
+w2.onmessage = (msg): void => {
+  console.log(msg.data);
+  w2MsgCount++;
+  if (w2MsgCount === 1) {
+    w2.postMessage("CONTINUE");
+  } else {
+    Deno.exit(0);
+  }
+};
+w1.postMessage("START");

tests/039_worker_deno_ns.ts.out

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+has_ns.ts: is window.Deno available: true
+[SPAWNED BY has_ns.ts] maybe_ns.ts: is window.Deno available: true
+no_ns.ts: is window.Deno available: false
+[SPAWNED BY no_ns.ts] maybe_ns.ts: is window.Deno available: false

tests/039_worker_deno_ns/has_ns.ts

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+onmessage = (msg): void => {
+  if (msg.data === "START") {
+    postMessage("has_ns.ts: is window.Deno available: " + !!window.Deno);
+  } else {
+    const worker = new Worker("./tests/039_worker_deno_ns/maybe_ns.ts");
+    worker.onmessage = (msg): void => {
+      postMessage("[SPAWNED BY has_ns.ts] " + msg.data);
+    };
+  }
+};

tests/039_worker_deno_ns/maybe_ns.ts

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+postMessage("maybe_ns.ts: is window.Deno available: " + !!window.Deno);

tests/039_worker_deno_ns/no_ns.ts

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+onmessage = (msg): void => {
+  if (msg.data === "START") {
+    postMessage("no_ns.ts: is window.Deno available: " + !!window.Deno);
+  } else {
+    const worker = new Worker("./tests/039_worker_deno_ns/maybe_ns.ts");
+    worker.onmessage = (msg): void => {
+      postMessage("[SPAWNED BY no_ns.ts] " + msg.data);
+    };
+  }
+};