SchemaProviderServletTest.java

package com.epam.wilma.webapp.config.servlet;

/*==========================================================================
Copyright 2013-2017 EPAM Systems

This file is part of Wilma.

Wilma is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Wilma is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Wilma.  If not, see <http://www.gnu.org/licenses/>.
===========================================================================*/

import static org.mockito.BDDMockito.given;
import static org.mockito.Mockito.verify;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;
import org.mockito.internal.util.reflection.Whitebox;
import org.slf4j.Logger;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import com.epam.wilma.webapp.config.servlet.helper.BufferedReaderFactory;

/**
 * Provides unit tests for the class {@link SchemaProviderServlet}.
 * @author Tunde_Kovacs
 *
 */
public class SchemaProviderServletTest {

    private static final String SCHEMA = "StubConfig.xsd";
    @Mock
    private BufferedReaderFactory bufferedReaderFactory;
    @Mock
    private Logger logger;
    @Mock
    private HttpServletRequest request;
    @Mock
    private HttpServletResponse response;
    @Mock
    private PrintWriter writer;
    @Mock
    private BufferedReader reader;

    @InjectMocks
    private SchemaProviderServlet underTest;

    @BeforeMethod
    public void setUp() throws IOException {
        MockitoAnnotations.initMocks(this);
        Whitebox.setInternalState(underTest, "stubConfigSchemaLocation", SCHEMA);
        Whitebox.setInternalState(underTest, "logger", logger);
        given(response.getWriter()).willReturn(writer);
    }

    @Test
    public void testDoGetShouldWriteSchemaFile() throws ServletException, IOException {
        //GIVEN
        String nullString = null;
        given(bufferedReaderFactory.createBufferedReader(SCHEMA)).willReturn(reader);
        given(reader.readLine()).willReturn("first line", nullString);
        //WHEN
        underTest.doGet(request, response);
        //THEN
        verify(writer).write(Mockito.anyString());
    }

    @Test
    public void testDoGetShouldSetContentTypeToXml() throws ServletException, IOException {
        //GIVEN
        String nullString = null;
        given(bufferedReaderFactory.createBufferedReader(SCHEMA)).willReturn(reader);
        given(reader.readLine()).willReturn(nullString);
        //WHEN
        underTest.doGet(request, response);
        //THEN
        verify(response).setContentType("application/xml");
    }

    @Test
    public void testDoGetShouldCloseWriter() throws ServletException, IOException {
        //GIVEN
        String nullString = null;
        given(bufferedReaderFactory.createBufferedReader(SCHEMA)).willReturn(reader);
        given(reader.readLine()).willReturn(nullString);
        //WHEN
        underTest.doGet(request, response);
        //THEN
        verify(writer).close();
    }

    @Test
    public void testDoGetWhenIOExceptionShouldLogError() throws ServletException, IOException {
        //GIVEN
        given(bufferedReaderFactory.createBufferedReader(SCHEMA)).willReturn(reader);
        IOException exception = new IOException();
        given(reader.readLine()).willThrow(exception);
        //WHEN
        underTest.doGet(request, response);
        //THEN
        verify(logger).error(SCHEMA + " could not be read!", exception);
    }

    @Test
    public void testDoPostShouldCallDoGet() throws ServletException, IOException {
        //GIVEN
        String nullString = null;
        given(bufferedReaderFactory.createBufferedReader(SCHEMA)).willReturn(reader);
        given(reader.readLine()).willReturn("first line", nullString);
        //WHEN
        underTest.doPost(request, response);
        //THEN
        verify(writer).write(Mockito.anyString());
    }
}