SERVER-43973 Use a unique test name for each thread in ParallelTester

(cherry picked from commit 66cc9d9c2e7db216881afc605669028c55042e5e)
(cherry picked from commit 1679ee2b3a5247b104752c489b0d029c30d576af)

1 files changed, 10 insertions, 2 deletions

diff --git a/jstests/libs/parallelTester.js b/jstests/libs/parallelTester.js
index 78c22377c33..87e8fa65a28 100644
--- a/jstests/libs/parallelTester.js
+++ b/jstests/libs/parallelTester.js
@@ -396,11 +396,19 @@ if (typeof _threadInject != "undefined") {
         for (var i in params) {
             var param = params[i];
             var test = param.shift();
+
+            // Make a shallow copy of TestData so we can override the test name to
+            // prevent tests on different threads that to use jsTestName() as the
+            // collection name from colliding.
+            const clonedTestData = Object.assign({}, TestData);
+            clonedTestData.testName = `ParallelTesterThread${i}`;
+
             var t;
             if (newScopes)
-                t = new ScopedThread(wrapper, test, param, {TestData: TestData});
+                t = new ScopedThread(wrapper, test, param, {TestData: clonedTestData});
             else
-                t = new Thread(wrapper, test, param, {TestData: TestData});
+                t = new Thread(wrapper, test, param, {TestData: clonedTestData});
+
             runners.push(t);
         }