diff --git a/bin/travis/_includes.sh b/bin/travis/_includes.sh
index 86cb6f4cd..2ce54076d 100755
--- a/bin/travis/_includes.sh
+++ b/bin/travis/_includes.sh
@@ -33,11 +33,13 @@ function assert_env_vars {
 ORCA_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
 export ORCA_ROOT
 export ORCA_FIXTURE_DIR=${ORCA_FIXTURE_DIR:="$ORCA_ROOT/../orca-build"}
+export ORCA_FIXTURE_PROFILE=${ORCA_FIXTURE_PROFILE:="orca"}
 export ORCA_SUT_DIR=${ORCA_SUT_DIR:=${TRAVIS_BUILD_DIR}}
+export ORCA_SUT_HAS_NIGHTWATCH_TESTS=$(cd "$ORCA_SUT_DIR"; find . -regex ".*/Nightwatch/.*" -name \*.js)
 export ORCA_SUT_MACHINE_NAME=${ORCA_SUT_NAME##*\/}
-export ORCA_FIXTURE_PROFILE=${ORCA_FIXTURE_PROFILE:="orca"}
 export ORCA_TELEMETRY_ENABLE=${ORCA_TELEMETRY_ENABLE:="FALSE"}
 export ORCA_AMPLITUDE_USER_ID=${ORCA_AMPLITUDE_USER_ID:="$ORCA_SUT_NAME:$ORCA_SUT_BRANCH"}
+export ORCA_ENABLE_NIGHTWATCH=${ORCA_ENABLE_NIGHTWATCH:="TRUE"}
 export ORCA_YARN_DIR="${ORCA_FIXTURE_DIR}/docroot/core"
 export DRUPAL_NIGHTWATCH_IGNORE_DIRECTORIES="node_modules,vendor,.*,sites/*/files,sites/*/private,sites/simpletest"
 export DRUPAL_NIGHTWATCH_OUTPUT="sites/default/reports/nightwatch"
@@ -48,9 +50,6 @@ export DRUPAL_TEST_DB_URL="sqlite://localhost/sites/default/files/db.sqlite"
 export DRUPAL_TEST_WEBDRIVER_CHROME_ARGS="--disable-gpu --headless --no-sandbox"
 export DRUPAL_TEST_WEBDRIVER_HOSTNAME="localhost"
 export DRUPAL_TEST_WEBDRIVER_PORT="4444"
-# This "bult-in" variable isn't available to scripts and must be set manually.
-TRAVIS_NODE_VERSION="$(node -v 2> /dev/null)"
-export TRAVIS_NODE_VERSION
 
 # Override the available columns setting to prevent Drush output from wrapping
 # too narrowly.
diff --git a/bin/travis/install.sh b/bin/travis/install.sh
index bdd51fc3c..7272a7006 100755
--- a/bin/travis/install.sh
+++ b/bin/travis/install.sh
@@ -13,11 +13,10 @@ cd "$(dirname "$0")" || exit; source _includes.sh
 
 assert_env_vars
 
-RUN_NIGHTWATCH=TRUE
 case "$ORCA_JOB" in
-  "STATIC_CODE_ANALYSIS") unset RUN_NIGHTWATCH ;;
-  "DEPRECATED_CODE_SCAN") orca debug:packages; eval "orca fixture:init -f --sut=$ORCA_SUT_NAME --sut-only --no-site-install"; unset RUN_NIGHTWATCH ;;
-  "DEPRECATED_CODE_SCAN_CONTRIB") orca debug:packages; eval "orca fixture:init -f --no-site-install"; unset RUN_NIGHTWATCH ;;
+  "STATIC_CODE_ANALYSIS") unset ORCA_ENABLE_NIGHTWATCH ;;
+  "DEPRECATED_CODE_SCAN") orca debug:packages; eval "orca fixture:init -f --sut=$ORCA_SUT_NAME --sut-only --no-site-install"; unset ORCA_ENABLE_NIGHTWATCH ;;
+  "DEPRECATED_CODE_SCAN_CONTRIB") orca debug:packages; eval "orca fixture:init -f --no-site-install"; unset ORCA_ENABLE_NIGHTWATCH ;;
   "ISOLATED_RECOMMENDED") orca debug:packages CURRENT_RECOMMENDED; eval "orca fixture:init -f --sut=$ORCA_SUT_NAME --sut-only --core=CURRENT_RECOMMENDED --profile=$ORCA_FIXTURE_PROFILE" ;;
   "INTEGRATED_RECOMMENDED") orca debug:packages CURRENT_RECOMMENDED; eval "orca fixture:init -f --sut=$ORCA_SUT_NAME --core=CURRENT_RECOMMENDED --profile=$ORCA_FIXTURE_PROFILE" ;;
   "CORE_PREVIOUS") orca debug:packages PREVIOUS_RELEASE; eval "orca fixture:init -f --sut=$ORCA_SUT_NAME --core=PREVIOUS_RELEASE --profile=$ORCA_FIXTURE_PROFILE" ;;
@@ -28,8 +27,7 @@ case "$ORCA_JOB" in
   "CUSTOM") eval "orca fixture:init -f --sut=$ORCA_SUT_NAME --profile=$ORCA_FIXTURE_PROFILE ${ORCA_CUSTOM_FIXTURE_INIT_ARGS:=}" ;;
 esac
 
-# Install yarn on relevant jobs if Node is installed and a fixture exists.
-if [[ "$RUN_NIGHTWATCH" && "$TRAVIS_NODE_VERSION" && -d "$ORCA_YARN_DIR" ]]; then
+if [[ "$ORCA_ENABLE_NIGHTWATCH" && "$ORCA_SUT_HAS_NIGHTWATCH_TESTS" && -d "$ORCA_YARN_DIR" ]]; then
   (
     cd "$ORCA_YARN_DIR" || exit
     eval "yarn install"
diff --git a/bin/travis/script.sh b/bin/travis/script.sh
index 55bdfc156..1540b2eea 100755
--- a/bin/travis/script.sh
+++ b/bin/travis/script.sh
@@ -20,11 +20,10 @@ assert_env_vars
 # Thus if the SUT changes it, only its own tests are run.
 [[ "$ORCA_FIXTURE_PROFILE" = "orca" ]] || SUT_ONLY="--sut-only"
 
-RUN_NIGHTWATCH=TRUE
 case "$ORCA_JOB" in
-  "STATIC_CODE_ANALYSIS") eval "orca qa:static-analysis $ORCA_SUT_DIR"; unset RUN_NIGHTWATCH ;;
-  "DEPRECATED_CODE_SCAN") eval "orca qa:deprecated-code-scan --sut=$ORCA_SUT_NAME"; unset RUN_NIGHTWATCH ;;
-  "DEPRECATED_CODE_SCAN_CONTRIB") eval "orca qa:deprecated-code-scan --contrib"; unset RUN_NIGHTWATCH ;;
+  "STATIC_CODE_ANALYSIS") eval "orca qa:static-analysis $ORCA_SUT_DIR"; unset ORCA_ENABLE_NIGHTWATCH ;;
+  "DEPRECATED_CODE_SCAN") eval "orca qa:deprecated-code-scan --sut=$ORCA_SUT_NAME"; unset ORCA_ENABLE_NIGHTWATCH ;;
+  "DEPRECATED_CODE_SCAN_CONTRIB") eval "orca qa:deprecated-code-scan --contrib"; unset ORCA_ENABLE_NIGHTWATCH ;;
   "ISOLATED_RECOMMENDED") eval "orca qa:automated-tests --sut=$ORCA_SUT_NAME --sut-only" ;;
   "INTEGRATED_RECOMMENDED")
     eval "orca qa:automated-tests --sut=$ORCA_SUT_NAME $SUT_ONLY --phpunit"
@@ -47,9 +46,7 @@ case "$ORCA_JOB" in
   "CUSTOM") eval "orca qa:automated-tests --sut=$ORCA_SUT_NAME ${ORCA_CUSTOM_TESTS_RUN_ARGS:=}" ;;
 esac
 
-# Run Nightwatch tests on relevant jobs if Node is installed and a fixture
-# exists.
-if [[ "$RUN_NIGHTWATCH" && "$TRAVIS_NODE_VERSION" && -d "$ORCA_YARN_DIR" ]]; then
+if [[ "$ORCA_ENABLE_NIGHTWATCH" && "$ORCA_SUT_HAS_NIGHTWATCH_TESTS" && -d "$ORCA_YARN_DIR" ]]; then
   (
     cd "$ORCA_YARN_DIR" || exit
     orca fixture:run-server &
diff --git a/config/VERSION b/config/VERSION
index 2e7bd9108..53b5bbb12 100644
--- a/config/VERSION
+++ b/config/VERSION
@@ -1 +1 @@
-v1.5.0
+v1.5.1
diff --git a/example/.travis.yml b/example/.travis.yml
index 2d3f6aae5..4ce988618 100644
--- a/example/.travis.yml
+++ b/example/.travis.yml
@@ -33,8 +33,7 @@ version: ~> 1.0
 # @see https://docs.acquia.com/acquia-cloud/arch/tech-platform/
 php: "7.2"
 
-# Uncomment the following line to run Nightwatch tests in your package.
-# node_js: "lts/*"
+node_js: "lts/*"
 
 addons:
   # Chrome is used via ChromeDriver by PHPUnit and Behat.
diff --git a/src/Command/Debug/DebugEnvVarsCommand.php b/src/Command/Debug/DebugEnvVarsCommand.php
index ba98be0bb..216405f14 100644
--- a/src/Command/Debug/DebugEnvVarsCommand.php
+++ b/src/Command/Debug/DebugEnvVarsCommand.php
@@ -25,8 +25,10 @@ class DebugEnvVarsCommand extends Command {
     'ORCA_PACKAGES_CONFIG_ALTER',
     'ORCA_PHPCS_STANDARD',
     'ORCA_ROOT',
+    'ORCA_ENABLE_NIGHTWATCH',
     'ORCA_SUT_BRANCH',
     'ORCA_SUT_DIR',
+    'ORCA_SUT_HAS_NIGHTWATCH_TESTS',
     'ORCA_SUT_MACHINE_NAME',
     'ORCA_SUT_NAME',
     'ORCA_TELEMETRY_ENABLE',