OAuth2Helper.java

    /**
     * Helper method to create an OAuth2 access token via MockMvc.
     * Result is a string that can be used in another mvc request.
     * Example:
     * <p>
     * MvcResult result = mvc.perform(get("/user/" + userToSearch.getUsername() + "/role")
     * .header("Authorization", "Bearer " + accessToken))
     * .andExpect(status().isOk())
     * .andReturn();
     *
     * @param username Username of the token requester.
     * @param password Password of the token requester.
     * @return String of the access token.
     * @author Bennett Dams
     */
    private String obtainAccessToken(String username, String password) throws Exception {
        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        params.add("grant_type", "password");
        params.add("client_id", "emiclient");
        params.add("username", username);
        params.add("password", password);

        ResultActions result
            = mvc.perform(post("/oauth/token")
            .params(params)
            .with(httpBasic("emiclient", "password"))
            .accept("application/json;charset=UTF-8"))
            .andExpect(status().isOk())
            .andExpect(content().contentType("application/json;charset=UTF-8"));

        String resultString = result.andReturn().getResponse().getContentAsString();

        JacksonJsonParser jsonParser = new JacksonJsonParser();
        return jsonParser.parseMap(resultString).get("access_token").toString();
    }