test(NODE-3299): convert txn legacy spec tests

Author: durran

test/integration/transactions/transactions.spec.test.js

@@ -0,0 +1,34 @@
+import * as path from 'path';
+
+import { loadSpecTests } from '../../spec';
+import { runUnifiedSuite } from '../../tools/unified-spec-runner/runner';
+
+const SKIPPED_TESTS = [
+  // TODO(NODE-5925) - secondary read preference not allowed in transactions.
+  'readPreference inherited from defaultTransactionOptions',
+  // TODO(NODE-5924) - Fix modification of readConcern object post message send.
+  'readConcern local in defaultTransactionOptions',
+  'defaultTransactionOptions override client options',
+  'transaction options inherited from defaultTransactionOptions',
+  'transaction options inherited from client',
+  'causal consistency disabled'
+  // TODO(NODE-5855) - Gone away after NODE-5929
+];
+
+describe('Transactions Spec Unified Tests', function () {
+  this.beforeEach(function () {
+    if (this.configuration.topologyType === 'LoadBalanced') {
+      if (this.currentTest) {
+        this.currentTest.skipReason =
+          'TODO(NODE-5931) - Fix socket leaks in load balancer transaction tests.';
+      }
+    }
+    this.skip();
+  });
+
+  runUnifiedSuite(loadSpecTests(path.join('transactions', 'unified')), test => {
+    return SKIPPED_TESTS.includes(test.description)
+      ? 'TODO(NODE-5924/NODE-5925): Skipping failing transaction tests'
+      : false;
+  });
+});