Added env unit test, updated env integration test, fixed env

integration_tests/dockerfiles/Dockerfile_test_env

@@ -1,5 +1,15 @@
-FROM gcr.io/distroless/base
+FROM gcr.io/google-appengine/debian9
 ENV hey hey
 ENV PATH /usr/local
 ENV hey hello
 ENV first=foo second=foo2
+ENV third $second:/third
+ENV myName="John Doe" myDog=Rex\ The\ Dog \
+    myCat=fluffy
+ENV PATH something
+ENV test=value\ value2
+ENV test1="a'b'c"
+ENV test2='a"b"c'
+ENV test3=a\ b name2=b\ c
+ENV test4="a\"b"
+ENV test5='a\"b'

integration_tests/dockerfiles/test_env.yaml

@@ -4,8 +4,30 @@ metadataTest:
     - key: hey
       value: hello
     - key: PATH
-      value: /usr/local
+      value: something
     - key: first
       value: foo
     - key: second
       value: foo2
+    - key: third
+      value: foo2:/third
+    - key: myName
+      value: John Doe
+    - key: myDog
+      value: Rex The Dog
+    - key: myCat
+      value: fluffy
+    - key: test
+      value: value value2
+    - key: test1
+      value: a'b'c
+    - key: test2
+      value: a"b"c
+    - key: test3
+      value: a b
+    - key: name2
+      value: b c
+    - key: test4
+      value: a"b
+    - key: test5
+      value: a\"b