Add test to simulate initContainer (#22)

Author: briandealwis

skaffold-duct-tape/test/duct-tape-structure-tests.yaml

@@ -8,3 +8,17 @@ fileExistenceTests:
     path: '/duct-tape/python/lib/python2.7/site-packages/ptvsd/__init__.py'
   - name: 'ptvsd for python 3.7'
     path: '/duct-tape/python/lib/python3.7/site-packages/ptvsd/__init__.py'
+
+
+commandTests:
+  - name: "run with no /dbg should fail"
+    command: "sh"
+    args: ["/install.sh"]
+    expectedError: ["Error: installation requires a volume mount at /dbg"]
+    exitCode: 1
+  - name: "run with /dbg should install"
+    setup: [["mkdir", "/dbg"]]
+    command: "sh"
+    args: ["/install.sh"]
+    expectedOutput: ["Installing runtime debugging support files in /dbg", "Installation complete"]
+    exitCode: 0