diff --git a/.travis.yml b/.travis.yml
index 926cd6854..f93169838 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,8 +36,10 @@ matrix:
       compiler: clang
 
 before_script:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; brew install bash gcc; clang --version; gfortran --version; fi
-  - if [[ "$TRAVIS_OS_NAME $CC" == "osx gcc" ]]; then export CC=gcc-9 ; export CXX=g++-9 ; $CC --version; $CXX --version; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then if [ x`brew list | fgrep bash` != x'bash' ]; then brew install bash; fi; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then if [ x`brew list | fgrep gcc` != x'gcc' ]; then brew install gcc; fi; fi
+  - if [[ "$TRAVIS_OS_NAME $CC" == "osx gcc" ]]; then export CC=gcc-9 ; export CXX=g++-9 ; $CC --version; $CXX --version; gfortran --version; fi
   - cd ..
   - wget https://raw.githubusercontent.com/coin-or/coinbrew/master/coinbrew
   - export PROJECT_URL=https://github.com/$TRAVIS_REPO_SLUG
diff --git a/test/unitTest.cpp b/test/unitTest.cpp
index 3bb8b9395..e6561a6e2 100644
--- a/test/unitTest.cpp
+++ b/test/unitTest.cpp
@@ -70,9 +70,10 @@ int main (int argc, const char *argv[])
   /*
     Set parameter defaults.
   */
-  std::string mpsDir = dataDir + dirsep + "Sample" + dirsep ;
-  std::string netlibDir = dataDir + dirsep + "Netlib" + dirsep ;
-  std::string testModel = "p0033.mps" ;
+  //TKR: Don't set defaults, must be specified. 
+  std::string mpsDir = ""; // = dataDir + dirsep + "Sample" + dirsep ;
+  std::string netlibDir = ""; // = dataDir + dirsep + "Netlib" + dirsep ;
+  std::string testModel = ""; // = "p0033.mps" ;
   /*
     Process command line parameters. Assume params of the
     form 'keyword' or 'keyword=value'.
@@ -172,12 +173,14 @@ int main (int argc, const char *argv[])
 # endif
 
 
-  testingMessage( "Testing CoinModel\n" );
-  CoinModelUnitTest(mpsDir,netlibDir,testModel);
-
+  if (netlibDir != "" && mpsDir != "" && testModel != ""){
+     testingMessage( "Testing CoinModel\n" );
+     CoinModelUnitTest(mpsDir,netlibDir,testModel);
+  }
+  
   testingMessage( "Testing CoinError\n" );
   CoinErrorUnitTest();
-
+  
   testingMessage( "Testing CoinShallowPackedVector\n" );
   CoinShallowPackedVectorUnitTest();
 
@@ -198,12 +201,14 @@ int main (int argc, const char *argv[])
   CoinDenseVectorUnitTest<float>(0.0f);
 #endif
 
-  testingMessage( "Testing CoinMpsIO\n" );
-  CoinMpsIOUnitTest(mpsDir);
-
-  testingMessage( "Testing CoinLpIO\n" );
-  CoinLpIOUnitTest(mpsDir);
+  if (mpsDir != ""){
+     testingMessage( "Testing CoinMpsIO\n" );
+     CoinMpsIOUnitTest(mpsDir);
 
+     testingMessage( "Testing CoinLpIO\n" );
+     CoinLpIOUnitTest(mpsDir);
+  }
+  
   testingMessage( "Testing CoinMessageHandler\n" );
   if (!CoinMessageHandlerUnitTest())
   { allOK = false ; }