Add travis retry all tests except for backend and linting (oppia#2890)

.travis.yml

@@ -83,25 +83,25 @@ install:
 - source scripts/setup_gae.sh || exit 1
 
 script:
-- if [ $RUN_E2E_TESTS_MAIN_EDITOR == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="mainEditor"; fi
-- if [ $RUN_E2E_TESTS_EDITOR_FEATURES == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="editorFeatures"; fi
-- if [ $RUN_E2E_TESTS_EXTENSIONS == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="extensions"; fi
-- if [ $RUN_E2E_TESTS_LIBRARY == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="library"; fi
-- if [ $RUN_E2E_TESTS_MISC == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="misc"; fi
-- if [ $RUN_E2E_TESTS_I18N == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="i18n"; fi
+- if [ $RUN_E2E_TESTS_MAIN_EDITOR == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="mainEditor"; fi
+- if [ $RUN_E2E_TESTS_EDITOR_FEATURES == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="editorFeatures"; fi
+- if [ $RUN_E2E_TESTS_EXTENSIONS == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="extensions"; fi
+- if [ $RUN_E2E_TESTS_LIBRARY == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="library"; fi
+- if [ $RUN_E2E_TESTS_MISC == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="misc"; fi
+- if [ $RUN_E2E_TESTS_I18N == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="i18n"; fi
 - if [ $RUN_BACKEND_TESTS == 'true' ] && [ $REPORT_BACKEND_COVERAGE == 'true' ]; then bash scripts/run_backend_tests.sh --generate_coverage_report; fi
 - if [ $RUN_BACKEND_TESTS == 'true' ] && [ $REPORT_BACKEND_COVERAGE == 'false' ]; then bash scripts/run_backend_tests.sh; fi
 - if [ $RUN_LINT == 'true' ]; then bash scripts/install_third_party.sh; python scripts/pre_commit_linter.py --path=.; fi
 # Travis aborts test run if nothing is printed back to STDOUT for some time.
 # -x is used to avoid that.
-- if [ $RUN_FRONTEND_TESTS == 'true' ]; then bash -x scripts/run_frontend_tests.sh --run-minified-tests=true; fi
+- if [ $RUN_FRONTEND_TESTS == 'true' ]; then travis_retry bash -x scripts/run_frontend_tests.sh --run-minified-tests=true; fi
 # Run e2e tests in production mode.
-- if [ $RUN_E2E_TESTS_MAIN_EDITOR_PROD == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="mainEditor" --prod_env; fi
-- if [ $RUN_E2E_TESTS_EDITOR_FEATURES_PROD == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="editorFeatures" --prod_env; fi
-- if [ $RUN_E2E_TESTS_EXTENSIONS_PROD == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="extensions" --prod_env; fi
-- if [ $RUN_E2E_TESTS_LIBRARY_PROD == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="library" --prod_env; fi
-- if [ $RUN_E2E_TESTS_MISC_PROD == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="misc" --prod_env; fi
-- if [ $RUN_E2E_TESTS_I18N_PROD == 'true' ]; then bash scripts/run_e2e_tests.sh --suite="i18n" --prod_env; fi
+- if [ $RUN_E2E_TESTS_MAIN_EDITOR_PROD == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="mainEditor" --prod_env; fi
+- if [ $RUN_E2E_TESTS_EDITOR_FEATURES_PROD == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="editorFeatures" --prod_env; fi
+- if [ $RUN_E2E_TESTS_EXTENSIONS_PROD == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="extensions" --prod_env; fi
+- if [ $RUN_E2E_TESTS_LIBRARY_PROD == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="library" --prod_env; fi
+- if [ $RUN_E2E_TESTS_MISC_PROD == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="misc" --prod_env; fi
+- if [ $RUN_E2E_TESTS_I18N_PROD == 'true' ]; then travis_retry bash scripts/run_e2e_tests.sh --suite="i18n" --prod_env; fi
 
 after_success:
 - if [ $RUN_BACKEND_TESTS == 'true' ] && [ $REPORT_BACKEND_COVERAGE == 'true' ]; then codecov; fi