$puppetversion and other top level variables not present when running tests

Seems 4.3.0 and 4.3.1 versions are affected:

Failure/Error: it

error during compilation: Evaluation Error: Error while evaluating a Function Call, 'versioncmp' parameter 'a' expects a String value, got Undef at ...

Example 1:

if (versioncmp($::puppetversion, '3') != -1) {

    ...

}

Example 2:

if versioncmp($::puppetversion, '4.0.0') >= 0 {

    ...

}