Random-route/hostname conflict: test the command-line settings merger

- `--hostname` should override `random-route=true` in a manifest.

[finishes #170197643]

Co-authored-by: Eric Promislow <[email protected]>
Co-authored-by: Steve Taylor <[email protected]>

Author: Eric Promislow

actor/pushaction/command_line_settings_test.go

@@ -226,6 +226,11 @@ var _ = Describe("CommandLineSettings", func() {
 			manifest.Application{RandomRoute: true},
 			manifest.Application{RandomRoute: true},
 		),
+		Entry("hostname overrides random route",
+			CommandLineSettings{DefaultRouteHostname: "scott's merchandise"},
+			manifest.Application{RandomRoute: true},
+			manifest.Application{Hostname: "scott's merchandise", RandomRoute: false},
+		),
 		Entry("overrides route path",
 			CommandLineSettings{RoutePath: "/some-route-path"},
 			manifest.Application{},