HandleCreateNoOptionsUserSuccessfully creates an HTTP handler at `/users` on the test handler mux that tests user creation.

HandleCreateUserSuccessfully creates an HTTP handler at `/users` on the test handler mux that tests user creation.

HandleDeleteUserSuccessfully creates an HTTP handler at `/users` on the test handler mux that tests user deletion.

HandleGetUserSuccessfully creates an HTTP handler at `/users` on the test handler mux that responds with a single user.

HandleListInGroupSuccessfully creates an HTTP handler at /groups/{groupID}/users on the test handler mux that response with a list of two users.

HandleListUserGroupsSuccessfully creates an HTTP handler at /users/{userID}/groups on the test handler mux that respons with a list of two groups.

HandleListUserProjectsSuccessfully creates an HTTP handler at /users/{userID}/projects on the test handler mux that respons wit a list of two projects.

HandleListUsersSuccessfully creates an HTTP handler at `/users` on the test handler mux that responds with a list of two users.

HandleUpdateUserSuccessfully creates an HTTP handler at `/users` on the test handler mux that tests user update.

CreateNoOptionsRequest provides the input to a Create request with no Options.

CreateRequest provides the input to a Create request.

GetOutput provides a Get result.

GetOutputNoOptions provides a Get result of a user with no options.

ListGroupsOutput provides a ListGroups result.

ListOutput provides a single page of User results.

ListProjectsOutput provides a ListProjects result.

UpdateOutput provides an update result.

UpdateRequest provides the input to as Update request.

ExpectedUsersSlice is the slice of users expected to be returned from ListOutput.

SecondUser is the second user in the List request.

SecondUserUpdated is how SecondUser should look after an Update.