Mocha Tests: should read from and write to an example table using transactions failed

[flaky-bot]

Note: #984 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: a911886
buildURL: Build Status, Sponge
status: failed

Test output

expected '' to match /The first album's marketing budget: 100000/
AssertionError: expected '' to match /The first album's marketing budget: 100000/
    at Context.it (system-test/spanner.test.js:364:12)

[flaky-bot]

commit: 9206e89
buildURL: Build Status, Sponge
status: failed

Test output

expected '' to match /The first album's marketing budget: 100000/
AssertionError: expected '' to match /The first album's marketing budget: 100000/
    at Context.it (system-test/spanner.test.js:364:12)

[flaky-bot]

Test passed for commit f9e47d9 (Build Status, Sponge)! Closing this issue.