### Question:
OAuthUtils { public static String encodeAuthorizationBearerHeader(Map<String, Object> entries) { StringBuffer sb = new StringBuffer(); sb.append(OAuth.OAUTH_HEADER_NAME).append(" "); for (Map.Entry<String, Object> entry : entries.entrySet()) { String value = entry.getValue() == null? null: String.valueOf(entry.getValue()); if (!OAuthUtils.isEmpty(entry.getKey()) && !OAuthUtils.isEmpty(value)) { sb.append(value); } } return sb.toString(); }  static String format(
        final Collection<? extends Map.Entry<String, Object>> parameters,
        final String encoding); static String saveStreamAsString(InputStream is); static String toString(
        final InputStream is, final String defaultCharset); static OAuthProblemException handleOAuthProblemException(String message); static OAuthProblemException handleMissingParameters(Set<String> missingParams); static OAuthProblemException handleBadContentTypeException(String expectedContentType); static OAuthProblemException handleNotAllowedParametersOAuthException(
        List<String> notAllowedParams); static Map<String, Object> decodeForm(String form); static boolean isFormEncoded(String contentType); static String decodePercent(String s); static String percentEncode(String s); static T instantiateClass(Class<T> clazz); static T instantiateClassWithParameters(Class<T> clazz, Class<?>[] paramsTypes,
                                                       Object[] paramValues); static String getAuthHeaderField(String authHeader); static Map<String, String> decodeOAuthHeader(String header); static String[] decodeClientAuthenticationHeader(String authenticationHeader); static String encodeOAuthHeader(Map<String, Object> entries); static String encodeAuthorizationBearerHeader(Map<String, Object> entries); static boolean isEmpty(String value); static boolean hasEmptyValues(String[] array); static String getAuthzMethod(String header); static Set<String> decodeScopes(String s); static String encodeScopes(Set<String> s); static boolean isMultipart(HttpServletRequest request); static boolean hasContentType(String requestContentType, String requiredContentType); static final String AUTH_SCHEME; static final String MULTIPART; }### Answer:
@Test public void testEncodeAuthorizationBearerHeader() throws Exception { Map<String, Object> parameters = new HashMap<String, Object>(); parameters.put("accessToken", "mF_9.B5f-4.1JqM"); String header = OAuthUtils.encodeAuthorizationBearerHeader(parameters); assertEquals("Bearer mF_9.B5f-4.1JqM", header); }