Fix fatal syntax error "unexpected '-', expecting '{'"

[Hecke29]

caused by special chars in wsdl filename

This might also fix sebastianbergmann/phpunit-mock-objects#357 and fix #2573

Stumbled over that bug yesterday. Remote file could be load via http (http://example.org/soap.wsdl) but saved as local file with name (/home/user/my-dir/acme-soap.wsdl) lead to that error.

[codecov-io]

Codecov Report

Merging #3219 into 7.2 will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                7.2    #3219      +/-   ##
============================================
+ Coverage     81.43%   81.43%   +<.01%     
  Complexity     3393     3393              
============================================
  Files           137      137              
  Lines          8978     8979       +1     
============================================
+ Hits           7311     7312       +1     
  Misses         1667     1667

Impacted Files	Coverage Δ	Complexity Δ
src/Framework/TestCase.php	75.89% <100%> (+0.02%)	307 <0> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0102d46...1009f7b. Read the comment docs.

[sebastianbergmann]

Cherry-picked into 7.3 and merged to master from there.