diff --git a/packages/angular/test/build.sh b/packages/angular/test/build.sh
index d91b9cb1771..f597a55f9e6 100755
--- a/packages/angular/test/build.sh
+++ b/packages/angular/test/build.sh
@@ -22,6 +22,12 @@ FULL_BASE_DIR="${BASE_DIR}/."
 # The full path to the built application.
 BUILD_APP_DIR="${BUILD_DIR}/${APP_DIR}/"
 
+# Make sure the full app directory exists.
+if [ ! -d $FULL_APP_DIR ]; then
+  echo "Could not find test app: ${FULL_APP_DIR}"
+  exit 1
+fi
+
 # Make the build directory if it does not already exist.
 mkdir -p $BUILD_DIR
 
diff --git a/packages/react/test/build.sh b/packages/react/test/build.sh
index a646dc74ba8..51467aee36b 100755
--- a/packages/react/test/build.sh
+++ b/packages/react/test/build.sh
@@ -22,6 +22,12 @@ FULL_BASE_DIR="${BASE_DIR}/."
 # The full path to the built application.
 BUILD_APP_DIR="${BUILD_DIR}/${APP_DIR}/"
 
+# Make sure the full app directory exists.
+if [ ! -d $FULL_APP_DIR ]; then
+  echo "Could not find test app: ${FULL_APP_DIR}"
+  exit 1
+fi
+
 # Make the build directory if it does not already exist.
 mkdir -p $BUILD_DIR
 
diff --git a/packages/vue/test/build.sh b/packages/vue/test/build.sh
index a646dc74ba8..51467aee36b 100755
--- a/packages/vue/test/build.sh
+++ b/packages/vue/test/build.sh
@@ -22,6 +22,12 @@ FULL_BASE_DIR="${BASE_DIR}/."
 # The full path to the built application.
 BUILD_APP_DIR="${BUILD_DIR}/${APP_DIR}/"
 
+# Make sure the full app directory exists.
+if [ ! -d $FULL_APP_DIR ]; then
+  echo "Could not find test app: ${FULL_APP_DIR}"
+  exit 1
+fi
+
 # Make the build directory if it does not already exist.
 mkdir -p $BUILD_DIR