Missed a spot for disabling tests

Author: dolio

.travis.yml

@@ -82,7 +82,7 @@ install:
 # any command which exits with a non-zero exit code causes the build to fail.
 script:
  - if [ -f configure.ac ]; then autoreconf -i; fi
- - cabal configure --enable-tests --enable-benchmarks -v2  # -v2 provides useful information for debugging
+ - cabal configure --enable-tests $TESTS --enable-benchmarks -v2  # -v2 provides useful information for debugging
  - cabal build   # this builds all libraries and executables (including tests/benchmarks)
  - if [ "$TESTS" = '--disable-tests' ]; then cabal test; fi
 # - cabal check