diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index faca9de..06f39ab 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,12 +10,14 @@ on:
     branches:
       - master
 
+concurrency:
+  group: build-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   unit-tests-master:
     name: unit-tests
     runs-on: ubuntu-20.04
-    strategy:
-      fail-fast: true
     env:
       DOKKU_VERSION: master
 
@@ -58,8 +60,6 @@ jobs:
   unit-tests-0_19_0:
     name: unit-tests-0.19.0
     runs-on: ubuntu-20.04
-    strategy:
-      fail-fast: true
     env:
       DOKKU_TAG: v0.19.0
 
diff --git a/README.md b/README.md
index 0c54de0..ea0f023 100644
--- a/README.md
+++ b/README.md
@@ -72,8 +72,11 @@ flags:
 - `-i|--image IMAGE`: the image name to start the service with
 - `-I|--image-version IMAGE_VERSION`: the image version to start the service with
 - `-m|--memory MEMORY`: container memory limit in megabytes (default: unlimited)
+- `-N|--initial-network INITIAL_NETWORK`: the initial network to attach the service to
 - `-p|--password PASSWORD`: override the user-level service password
+- `-P|--post-create-network NETWORKS`: a comman-separated list of networks to attach the service container to after service creation
 - `-r|--root-password PASSWORD`: override the root-level service password
+- `-S|--post-start-network NETWORKS`: a comman-separated list of networks to attach the service container to after service start
 - `-s|--shm-size SHM_SIZE`: override shared memory size for postgres docker container
 
 Create a postgres service named lollipop:
@@ -454,7 +457,10 @@ flags:
 - `-C|--custom-env "USER=alpha;HOST=beta"`: semi-colon delimited environment variables to start the service with
 - `-i|--image IMAGE`: the image name to start the service with
 - `-I|--image-version IMAGE_VERSION`: the image version to start the service with
+- `-N|--initial-network INITIAL_NETWORK`: the initial network to attach the service to
+- `-P|--post-create-network NETWORKS`: a comman-separated list of networks to attach the service container to after service creation
 - `-R|--restart-apps "true"`: whether to force an app restart
+- `-S|--post-start-network NETWORKS`: a comman-separated list of networks to attach the service container to after service start
 - `-s|--shm-size SHM_SIZE`: override shared memory size for postgres docker container
 
 You can upgrade an existing service to a new image or image-version:
@@ -525,8 +531,11 @@ flags:
 - `-i|--image IMAGE`: the image name to start the service with
 - `-I|--image-version IMAGE_VERSION`: the image version to start the service with
 - `-m|--memory MEMORY`: container memory limit in megabytes (default: unlimited)
+- `-N|--initial-network INITIAL_NETWORK`: the initial network to attach the service to
 - `-p|--password PASSWORD`: override the user-level service password
+- `-P|--post-create-network NETWORKS`: a comman-separated list of networks to attach the service container to after service creation
 - `-r|--root-password PASSWORD`: override the root-level service password
+- `-S|--post-start-network NETWORKS`: a comman-separated list of networks to attach the service container to after service start
 - `-s|--shm-size SHM_SIZE`: override shared memory size for postgres docker container
 
 You can clone an existing service to a new one:
diff --git a/commands b/commands
index 5a878fe..0b22b42 100755
--- a/commands
+++ b/commands
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
 [[ " help $PLUGIN_COMMAND_PREFIX:help $PLUGIN_COMMAND_PREFIX $PLUGIN_COMMAND_PREFIX:default " == *" $1 "* ]] || [[ "$1" == "$PLUGIN_COMMAND_PREFIX:"* ]] || exit "$DOKKU_NOT_IMPLEMENTED_EXIT"
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
diff --git a/common-functions b/common-functions
index b42ac0d..10a4677 100755
--- a/common-functions
+++ b/common-functions
@@ -2,7 +2,7 @@
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/property-functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
 source "$PLUGIN_AVAILABLE_PATH/config/functions"
 
 add_to_links_file() {
@@ -349,6 +349,18 @@ service_commit_config() {
   if [[ -n "$PLUGIN_IMAGE_VERSION" ]]; then
     echo "$PLUGIN_IMAGE_VERSION" >"$SERVICE_ROOT/IMAGE_VERSION"
   fi
+
+  if [[ -n "$SERVICE_INITIAL_NETWORK" ]]; then
+    fn-plugin-property-write "$PLUGIN_COMMAND_PREFIX" "$SERVICE" "initial-network" "$SERVICE_INITIAL_NETWORK"
+  fi
+
+  if [[ -n "$SERVICE_POST_CREATE_NETWORK" ]]; then
+    fn-plugin-property-write "$PLUGIN_COMMAND_PREFIX" "$SERVICE" "post-create-network" "$SERVICE_POST_CREATE_NETWORK"
+  fi
+
+  if [[ -n "$SERVICE_POST_START_NETWORK" ]]; then
+    fn-plugin-property-write "$PLUGIN_COMMAND_PREFIX" "$SERVICE" "post-start-network" "$SERVICE_POST_START_NETWORK"
+  fi
 }
 
 service_backup_auth() {
@@ -699,9 +711,12 @@ service_parse_args() {
       "--custom-env") set -- "$@" "-C" ;;
       "--database") set -- "$@" "-d" ;;
       "--image-version") set -- "$@" "-I" ;;
+      "--initial-network") set -- "$@" "-N" ;;
       "--image") set -- "$@" "-i" ;;
       "--memory") set -- "$@" "-m" ;;
       "--password") set -- "$@" "-p" ;;
+      "--post-create-network") set -- "$@" "-P" ;;
+      "--post-start-network") set -- "$@" "-S" ;;
       "--querystring") set -- "$@" "-q" ;;
       "--restart-apps") set -- "$@" "-R" ;;
       "--root-password") set -- "$@" "-r" ;;
@@ -712,7 +727,7 @@ service_parse_args() {
   done
 
   OPTIND=1
-  while getopts "a:c:C:d:i:I:m:p:q:R:r:s:u:" opt; do
+  while getopts "a:c:C:d:i:I:m:n:N:p:P:q:R:r:s:S:u:" opt; do
     case "$opt" in
       a)
         SERVICE_ALIAS="${OPTARG^^}"
@@ -736,9 +751,15 @@ service_parse_args() {
       m)
         export SERVICE_MEMORY=$OPTARG
         ;;
+      N)
+        export SERVICE_INITIAL_NETWORK=$OPTARG
+        ;;
       p)
         export SERVICE_PASSWORD=$OPTARG
         ;;
+      P)
+        export SERVICE_POST_CREATE_NETWORK=$OPTARG
+        ;;
       q)
         export SERVICE_QUERYSTRING=${OPTARG#"?"}
         ;;
@@ -751,6 +772,9 @@ service_parse_args() {
       s)
         export SERVICE_SHM_SIZE=$OPTARG
         ;;
+      S)
+        export SERVICE_POST_START_NETWORK=$OPTARG
+        ;;
       u)
         export SERVICE_USER=$OPTARG
         ;;
diff --git a/functions b/functions
index a38dffc..354447a 100755
--- a/functions
+++ b/functions
@@ -3,8 +3,8 @@ source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common-functions"
-source "$PLUGIN_BASE_PATH/common/functions"
-source "$PLUGIN_BASE_PATH/common/property-functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
 source "$PLUGIN_AVAILABLE_PATH/config/functions"
 if [[ -f "$PLUGIN_AVAILABLE_PATH/docker-options/functions" ]]; then
   source "$PLUGIN_AVAILABLE_PATH/docker-options/functions"
@@ -133,7 +133,12 @@ service_create_container() {
   fi
 
   dokku_log_verbose_quiet "Waiting for container to be ready"
-  "$DOCKER_BIN" container run "${LINK_CONTAINER_DOCKER_ARGS[@]}" "$PLUGIN_WAIT_IMAGE" -c "$SERVICE_NAME:$PLUGIN_DATASTORE_WAIT_PORT" >/dev/null
+  if ! suppress_output "$DOCKER_BIN" container run "${LINK_CONTAINER_DOCKER_ARGS[@]}" "$PLUGIN_WAIT_IMAGE" -c "$SERVICE_NAME:$PLUGIN_DATASTORE_WAIT_PORT"; then
+    dokku_log_info2_quiet "Start of $SERVICE container output"
+    dokku_container_log_verbose_quiet "$SERVICE_NAME"
+    dokku_log_info2_quiet "End of $SERVICE container output"
+    return 1
+  fi
 
   dokku_log_verbose_quiet "Creating container database"
   "$DOCKER_BIN" container exec "$SERVICE_NAME" su - postgres -c "createdb -E utf8 $DATABASE_NAME" 2>/dev/null || dokku_log_verbose_quiet 'Already exists'
diff --git a/install b/install
index 6b24efc..f8fc404 100755
--- a/install
+++ b/install
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common-functions"
-source "$PLUGIN_BASE_PATH/common/property-functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
 
diff --git a/pre-delete b/pre-delete
index 1f565d5..d315464 100755
--- a/pre-delete
+++ b/pre-delete
@@ -1,6 +1,5 @@
 #!/usr/bin/env bash
-source "$PLUGIN_BASE_PATH/common/functions"
-
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/functions"
 set -eo pipefail
diff --git a/subcommands/app-links b/subcommands/app-links
index b6df3a1..6b0a0eb 100755
--- a/subcommands/app-links
+++ b/subcommands/app-links
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-app-links-cmd() {
diff --git a/subcommands/backup b/subcommands/backup
index 161c191..354ed9b 100755
--- a/subcommands/backup
+++ b/subcommands/backup
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-cmd() {
diff --git a/subcommands/backup-auth b/subcommands/backup-auth
index 992b295..050397b 100755
--- a/subcommands/backup-auth
+++ b/subcommands/backup-auth
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-auth-cmd() {
diff --git a/subcommands/backup-deauth b/subcommands/backup-deauth
index d1d70cd..19cbe8a 100755
--- a/subcommands/backup-deauth
+++ b/subcommands/backup-deauth
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-deauth-cmd() {
diff --git a/subcommands/backup-schedule b/subcommands/backup-schedule
index 448f930..594c748 100755
--- a/subcommands/backup-schedule
+++ b/subcommands/backup-schedule
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-schedule-cmd() {
diff --git a/subcommands/backup-schedule-cat b/subcommands/backup-schedule-cat
index 0e3f2df..56a388a 100755
--- a/subcommands/backup-schedule-cat
+++ b/subcommands/backup-schedule-cat
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-schedule-cat-cmd() {
diff --git a/subcommands/backup-set-encryption b/subcommands/backup-set-encryption
index 3ad29e5..27cb86e 100755
--- a/subcommands/backup-set-encryption
+++ b/subcommands/backup-set-encryption
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-set-encryption-cmd() {
diff --git a/subcommands/backup-unschedule b/subcommands/backup-unschedule
index c3d3e31..874a22a 100755
--- a/subcommands/backup-unschedule
+++ b/subcommands/backup-unschedule
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-unschedule-cmd() {
diff --git a/subcommands/backup-unset-encryption b/subcommands/backup-unset-encryption
index f783220..c046a55 100755
--- a/subcommands/backup-unset-encryption
+++ b/subcommands/backup-unset-encryption
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-backup-unset-encryption-cmd() {
diff --git a/subcommands/clone b/subcommands/clone
index a7e2f64..eb10519 100755
--- a/subcommands/clone
+++ b/subcommands/clone
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-clone-cmd() {
@@ -15,8 +15,11 @@ service-clone-cmd() {
   #F -i|--image IMAGE, the image name to start the service with
   #F -I|--image-version IMAGE_VERSION, the image version to start the service with
   #F -m|--memory MEMORY, container memory limit in megabytes (default: unlimited)
+  #F -N|--initial-network INITIAL_NETWORK, the initial network to attach the service to
   #F -p|--password PASSWORD, override the user-level service password
+  #F -P|--post-create-network NETWORKS, a comman-separated list of networks to attach the service container to after service creation
   #F -r|--root-password PASSWORD, override the root-level service password
+  #F -S|--post-start-network NETWORKS, a comman-separated list of networks to attach the service container to after service start
   #F -s|--shm-size SHM_SIZE, override shared memory size for $PLUGIN_COMMAND_PREFIX docker container
   declare desc="create container <new-name> then copy data from <name> into <new-name>"
   local cmd="$PLUGIN_COMMAND_PREFIX:clone" argv=("$@")
diff --git a/subcommands/connect b/subcommands/connect
index 37d05a8..ad6abca 100755
--- a/subcommands/connect
+++ b/subcommands/connect
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-connect-cmd() {
diff --git a/subcommands/create b/subcommands/create
index 557b8b8..87135e5 100755
--- a/subcommands/create
+++ b/subcommands/create
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-create-cmd() {
@@ -23,8 +23,11 @@ service-create-cmd() {
   #F -i|--image IMAGE, the image name to start the service with
   #F -I|--image-version IMAGE_VERSION, the image version to start the service with
   #F -m|--memory MEMORY, container memory limit in megabytes (default: unlimited)
+  #F -N|--initial-network INITIAL_NETWORK, the initial network to attach the service to
   #F -p|--password PASSWORD, override the user-level service password
+  #F -P|--post-create-network NETWORKS, a comman-separated list of networks to attach the service container to after service creation
   #F -r|--root-password PASSWORD, override the root-level service password
+  #F -S|--post-start-network NETWORKS, a comman-separated list of networks to attach the service container to after service start
   #F -s|--shm-size SHM_SIZE, override shared memory size for $PLUGIN_COMMAND_PREFIX docker container
   declare desc="create a $PLUGIN_SERVICE service"
   local cmd="$PLUGIN_COMMAND_PREFIX:create" argv=("$@")
diff --git a/subcommands/destroy b/subcommands/destroy
index 1294b8a..cffe32d 100755
--- a/subcommands/destroy
+++ b/subcommands/destroy
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-destroy-cmd() {
@@ -49,6 +49,8 @@ service-destroy-cmd() {
   "$DOCKER_BIN" container run --rm -v "$SERVICE_HOST_ROOT/data:/data" -v "$SERVICE_HOST_ROOT/$PLUGIN_CONFIG_SUFFIX:/config" "$PLUGIN_BUSYBOX_IMAGE" chmod 777 -R /config /data
   rm -rf "$SERVICE_ROOT"
 
+  fn-plugin-property-destroy "$PLUGIN_COMMAND_PREFIX" "$SERVICE"
+
   plugn trigger service-action post-delete "$PLUGIN_COMMAND_PREFIX" "$SERVICE"
   dokku_log_info2 "$PLUGIN_SERVICE container deleted: $SERVICE"
 }
diff --git a/subcommands/enter b/subcommands/enter
index 13f6a31..9062beb 100755
--- a/subcommands/enter
+++ b/subcommands/enter
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-enter-cmd() {
diff --git a/subcommands/exists b/subcommands/exists
index ae59eee..6fd1bfc 100755
--- a/subcommands/exists
+++ b/subcommands/exists
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-exists-cmd() {
diff --git a/subcommands/export b/subcommands/export
index 7e5bc69..d77dd47 100755
--- a/subcommands/export
+++ b/subcommands/export
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-export-cmd() {
diff --git a/subcommands/expose b/subcommands/expose
index 57ead49..1e6b081 100755
--- a/subcommands/expose
+++ b/subcommands/expose
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-expose-cmd() {
diff --git a/subcommands/import b/subcommands/import
index fd2b89f..441f415 100755
--- a/subcommands/import
+++ b/subcommands/import
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-import-cmd() {
diff --git a/subcommands/info b/subcommands/info
index 9cba535..f9970d3 100755
--- a/subcommands/info
+++ b/subcommands/info
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-info-cmd() {
diff --git a/subcommands/link b/subcommands/link
index 73c6291..01c3028 100755
--- a/subcommands/link
+++ b/subcommands/link
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-link-cmd() {
diff --git a/subcommands/linked b/subcommands/linked
index 38cbc67..5d61d79 100755
--- a/subcommands/linked
+++ b/subcommands/linked
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-linked-cmd() {
diff --git a/subcommands/links b/subcommands/links
index 9f3609b..35586aa 100755
--- a/subcommands/links
+++ b/subcommands/links
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-links-cmd() {
diff --git a/subcommands/list b/subcommands/list
index cd4d52e..cebe31c 100755
--- a/subcommands/list
+++ b/subcommands/list
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-list-cmd() {
diff --git a/subcommands/logs b/subcommands/logs
index 55f13ac..7f2e90e 100755
--- a/subcommands/logs
+++ b/subcommands/logs
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-logs-cmd() {
diff --git a/subcommands/pause b/subcommands/pause
index acf43be..91d51fe 100755
--- a/subcommands/pause
+++ b/subcommands/pause
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-pause-cmd() {
diff --git a/subcommands/promote b/subcommands/promote
index cbd5cda..ddf35ad 100755
--- a/subcommands/promote
+++ b/subcommands/promote
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-promote-cmd() {
diff --git a/subcommands/restart b/subcommands/restart
index c7d11a0..9ff6b03 100755
--- a/subcommands/restart
+++ b/subcommands/restart
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-restart-cmd() {
diff --git a/subcommands/set b/subcommands/set
index 260c918..0bcf474 100755
--- a/subcommands/set
+++ b/subcommands/set
@@ -2,8 +2,8 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
-source "$PLUGIN_BASE_PATH/common/property-functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
 source "$(cd "$(dirname "$(dirname "${BASH_SOURCE[0]}")")" && pwd)/common-functions"
 
 service-set-cmd() {
diff --git a/subcommands/start b/subcommands/start
index 8416745..c928f3a 100755
--- a/subcommands/start
+++ b/subcommands/start
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-start-cmd() {
diff --git a/subcommands/stop b/subcommands/stop
index b20c32d..9680ea5 100755
--- a/subcommands/stop
+++ b/subcommands/stop
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-stop-cmd() {
diff --git a/subcommands/unexpose b/subcommands/unexpose
index 83e5239..a3e990a 100755
--- a/subcommands/unexpose
+++ b/subcommands/unexpose
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-unexpose-cmd() {
diff --git a/subcommands/unlink b/subcommands/unlink
index b1e37d6..7819079 100755
--- a/subcommands/unlink
+++ b/subcommands/unlink
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 service-unlink-cmd() {
diff --git a/subcommands/upgrade b/subcommands/upgrade
index 788c767..898b268 100755
--- a/subcommands/upgrade
+++ b/subcommands/upgrade
@@ -2,7 +2,7 @@
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_BASE_PATH/common/functions"
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 source "$PLUGIN_AVAILABLE_PATH/ps/functions"
 
@@ -14,7 +14,10 @@ service-upgrade-cmd() {
   #F -C|--custom-env "USER=alpha;HOST=beta", semi-colon delimited environment variables to start the service with
   #F -i|--image IMAGE, the image name to start the service with
   #F -I|--image-version IMAGE_VERSION, the image version to start the service with
+  #F -N|--initial-network INITIAL_NETWORK, the initial network to attach the service to
+  #F -P|--post-create-network NETWORKS, a comman-separated list of networks to attach the service container to after service creation
   #F -R|--restart-apps "true", whether to force an app restart
+  #F -S|--post-start-network NETWORKS, a comman-separated list of networks to attach the service container to after service start
   #F -s|--shm-size SHM_SIZE, override shared memory size for $PLUGIN_COMMAND_PREFIX docker container
   declare desc="upgrade service <service> to the specified versions"
   local cmd="$PLUGIN_COMMAND_PREFIX:upgrade" argv=("$@")
diff --git a/tests/hook_pre_delete.bats b/tests/hook_pre_delete.bats
index e849887..600b8b0 100755
--- a/tests/hook_pre_delete.bats
+++ b/tests/hook_pre_delete.bats
@@ -3,17 +3,18 @@ load test_helper
 
 setup() {
   dokku apps:create my-app
-  dokku "$PLUGIN_COMMAND_PREFIX:create" l
-  dokku "$PLUGIN_COMMAND_PREFIX:link" l my-app >&2
+  dokku "$PLUGIN_COMMAND_PREFIX:create" ls
+  dokku "$PLUGIN_COMMAND_PREFIX:link" ls my-app >&2
 }
 
 teardown() {
-  dokku "$PLUGIN_COMMAND_PREFIX:unlink" l my-app >&2
-  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" l
+  dokku "$PLUGIN_COMMAND_PREFIX:unlink" ls my-app >&2
+  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" ls
+  dokku --force apps:destroy my-app || true
 }
 
 @test "($PLUGIN_COMMAND_PREFIX:hook:pre-delete) removes app from links file when destroying app" {
-  [[ -n $(<"$PLUGIN_DATA_ROOT/l/LINKS") ]]
+  [[ -n $(<"$PLUGIN_DATA_ROOT/ls/LINKS") ]]
   dokku --force apps:destroy my-app
-  [[ -z $(<"$PLUGIN_DATA_ROOT/l/LINKS") ]]
+  [[ -z $(<"$PLUGIN_DATA_ROOT/ls/LINKS") ]]
 }
diff --git a/tests/link_networks.bats b/tests/link_networks.bats
new file mode 100755
index 0000000..6c1ffd8
--- /dev/null
+++ b/tests/link_networks.bats
@@ -0,0 +1,261 @@
+#!/usr/bin/env bats
+load test_helper
+
+setup() {
+  dokku "$PLUGIN_COMMAND_PREFIX:create" ls
+  dokku network:create custom-network
+}
+
+teardown() {
+  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" ls || true
+  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" lsa || true
+  dokku network:destroy --force custom-network
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:set) set initial-network" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:set" ls initial-network custom-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:info" ls --initial-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_output "custom-network"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network 0
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:stop" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:start" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge 0
+  assert_output_contains custom-network
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:set" ls initial-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:info" ls --initial-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_output ""
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:stop" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:start" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network 0
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:set) set post-create-network" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:set" ls post-create-network custom-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:info" ls --post-create-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_output "custom-network"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network 0
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:stop" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:start" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains custom-network
+  assert_output_contains bridge
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:set" ls post-create-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:info" ls --post-create-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_output ""
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:stop" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:start" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network 0
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:set) set an post-start-network" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:set" ls post-start-network custom-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:info" ls --post-start-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_output "custom-network"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network 0
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:stop" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:start" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:set" ls post-start-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:info" ls --post-start-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_output ""
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:stop" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:start" ls
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network 0
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:create) flags" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:create" lsa --initial-network custom-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect "dokku.$PLUGIN_COMMAND_PREFIX.lsa" -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge 0
+  assert_output_contains custom-network
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:destroy" lsa --force
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:create" lsa --post-create-network custom-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect "dokku.$PLUGIN_COMMAND_PREFIX.lsa" -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:destroy" lsa --force
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:create" lsa --post-start-network custom-network
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run docker inspect "dokku.$PLUGIN_COMMAND_PREFIX.lsa" -f '{{range $net,$v := .NetworkSettings.Networks}}{{printf "%s\n" $net}}{{end}}'
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains bridge
+  assert_output_contains custom-network
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:destroy" lsa --force
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+}
diff --git a/tests/test_helper.bash b/tests/test_helper.bash
index 8a0d1ee..fb397ab 100755
--- a/tests/test_helper.bash
+++ b/tests/test_helper.bash
@@ -70,3 +70,17 @@ assert_output() {
   fi
   assert_equal "$expected" "$output"
 }
+
+# ShellCheck doesn't know about $output from Bats
+# shellcheck disable=SC2154
+assert_output_contains() {
+  local input="$output"
+  local expected="$1"
+  local count="${2:-1}"
+  local found=0
+  until [ "${input/$expected/}" = "$input" ]; do
+    input="${input/$expected/}"
+    found=$((found + 1))
+  done
+  assert_equal "$count" "$found"
+}