Display image & version in list

tests/bin/docker

@@ -51,6 +51,11 @@ case "$1" in
       exit 0
     fi
 
+    if [[ $@ =~ \{\{.Config.Image\}\} ]]; then
+      echo "$PLUGIN_IMAGE:$PLUGIN_IMAGE_VERSION"
+      exit 0
+    fi
+
     if [[ $@ =~ \{\{\.State\..*\}\} ]]; then
       if [[ $@ =~ \{\{\.State\.Running\}\} ]]; then
         echo "true"

tests/service_list.bats

@@ -11,13 +11,13 @@ teardown() {
 
 @test "($PLUGIN_COMMAND_PREFIX:list) with no exposed ports" {
   run dokku "$PLUGIN_COMMAND_PREFIX:list"
-  assert_contains "${lines[*]}" "l (running)"
+  assert_contains "${lines[*]}" "l, postgres:9.4.4 (running)"
 }
 
 @test "($PLUGIN_COMMAND_PREFIX:list) with exposed ports" {
   dokku "$PLUGIN_COMMAND_PREFIX:expose" l 4242
   run dokku "$PLUGIN_COMMAND_PREFIX:list"
-  assert_contains "${lines[*]}" "l (running), exposed port(s): 5432->4242"
+  assert_contains "${lines[*]}" "l, postgres:9.4.4 (running), exposed port(s): 5432->4242"
 }
 
 @test "($PLUGIN_COMMAND_PREFIX:list) when there are no services" {