测试时的对象Mock

一般来说，JUnit4的时候，直接new这个对象就行了，没必要mock。但是有时遇到了很难new的对象，就不能new了，例如HttpServletRequest

private HttpServletRequest mock(String uri, String client_id, String secret) {
        HttpServletRequest request = EasyMock.createMock(HttpServletRequest.class);
        EasyMock.expect(request.getRequestURI()).andReturn(uri).anyTimes();

        DateFormat df = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.ENGLISH);
        long now = System.currentTimeMillis();
        String stringToSign = "POST" + " " + uri + "\n" + df.format(now);
        String sign = getSignature(stringToSign, secret);
        String auth = "MWS " + client_id + ":" + sign;
        EasyMock.expect(request.getHeader("Date")).andReturn(df.format(now)).anyTimes();
        EasyMock.expect(request.getHeader("Authorization")).andReturn(auth).anyTimes();
        EasyMock.expect(request.getMethod()).andReturn("POST");
        EasyMock.replay(request);
        return request;

    }

具体细节也没细究，可以网上查，不过一般上述Mock就够用了。
需要的依赖

<dependency>
            <groupId>easymock</groupId>
            <artifactId>easymock</artifactId>
            <version>2.0</version>
            <scope>test</scope>
        </dependency>