Demo :: Working with File system

before.java

@Before
public void createCSVFile() throws Exception {
	file = temporaryFolder.newFile("input.txt");
	PrintWriter out = new PrintWriter(file);
	out.print("1,2,3,4,5");
	out.close();
}

rule.java

@Rule
public TemporaryFolder temporaryFolder = new TemporaryFolder();
	

testcase.java

@Test
public void fileExistInTemporaryFolder() throws Exception {
	FileUtility.read(file);
}

@Test
public void readFileThatContentShouldNotNull() throws Exception {
	String output = FileUtility.read(file);
	assertTrue(output.length() > 0);
}

@Test
public void readCSVFileAndSubStringWithCommaShouldHaveSizeEqualFive() throws Exception {
	String output = FileUtility.read(file);
	SplitData splitData = new SplitData();
	assertEquals(5, splitData.process(output).length);
}