test: Enable scram tests on travis

.travis.yml

@@ -27,7 +27,7 @@ matrix:
     # Run tests/paths that require password authentication
     - node_js: lts/erbium
       env:
-        - CC=clang CXX=clang++ npm_config_clang=1 PGUSER=postgres PGDATABASE=postgres PGPASSWORD=test-password
+        - CC=clang CXX=clang++ npm_config_clang=1 PGUSER=postgres PGDATABASE=postgres PGPASSWORD=test-password SCRAM_TEST_PGUSER=scram_test SCRAM_TEST_PGPASSWORD=test4scram
       before_script: |
         sudo -u postgres sed -i \
           -e '/^local/ s/trust$/peer/' \
@@ -36,6 +36,9 @@ matrix:
         sudo -u postgres psql -c "ALTER ROLE postgres PASSWORD 'test-password'; SELECT pg_reload_conf()"
         yarn build
         node packages/pg/script/create-test-tables.js postgresql:///
+        sudo -u postgres -- psql \
+          -c "SET password_encryption = 'scram-sha-256'" \
+          -c "CREATE ROLE scram_test login password 'test4scram'"
 
     - node_js: lts/carbon
       addons: