Fix multi-line test

Author: lox

.buildkite/pipeline.yml

@@ -34,6 +34,17 @@ steps:
         environment:
           - ALPACAS=sometimes
 
+  - wait
+  - label: run, with multi-line command
+    command: |
+      echo \
+      hello \
+      world
+    plugins:
+      ${BUILDKITE_REPO}#${BUILDKITE_COMMIT}:
+        run: alpinewithenv
+        config: tests/composefiles/docker-compose.v2.1.yml
+
   - wait
   - label: prebuild with v2.0
     command: /hello

tests/run.bats

@@ -126,7 +126,8 @@ cmd3"
 
   stub docker-compose \
     "-f docker-compose.yml -p buildkite1111 build --pull myservice : echo built myservice" \
-    "-f docker-compose.yml -p buildkite1111 run --name buildkite1111_myservice_build_1 myservice /bin/sh -e -c 'cmd1\\ncmd2\\ncmd3' : echo ran myservice"
+    "-f docker-compose.yml -p buildkite1111 up -d --scale myservice=0 : echo ran myservice dependencies" \
+    "-f docker-compose.yml -p buildkite1111 run --name buildkite1111_myservice_build_1 myservice /bin/sh -e -c 'cmd1\ncmd2\ncmd3' : echo ran myservice"
 
   stub buildkite-agent \
     "meta-data get docker-compose-plugin-built-image-tag-myservice : exit 1"