Restores DataValues.tests.js as dataValues.tests.js

Accidentally deleted in patch set 2a9a54c787c34ff351d5c7317755c41b592f9ac9 while
DataValues.tests.js should have been renamed in dataValues.tests.js instead.

Change-Id: I1c8864388a09e2e6a881ec1f40598cd0d9b70ae9