topper1309 topper1309 - 16 days ago 6
Java Question

JUnit AssertionFailedError: Text in the file differs in java

I am using JUnit Test for testing purposes, but I am facing a problem of AssertionFailedError.
I am using command line arguments to pass Test cases to the main class.

Below is my Main.java code

public class Main {

public static void main(String[] args) throws IOException {


//Storing all the commands, words, files
ArrayList<String> commands = new ArrayList<>();
ArrayList<String> words = new ArrayList<>();
ArrayList<String> files = new ArrayList<>();

for(String arg: args){
if(arg.contains("."))
files.add(arg);
else if(arg.contains("-") && !arg.contains("--"))
commands.add(arg);
else{
if(!arg.contains("--"))
words.add(arg);
}
}

for(String file : files ){

File originalFile = new File(file);

//CHECK IF textFile exists
if(originalFile.exists()){
if(words.size() == 2){
String from = words.get(0), to=words.get(1);
BufferedWriter bw;
//If file exists then check command
for(String command : commands){
if(command.trim().contains("-f")){
File temp = new File("Temp.txt");
temp.createNewFile();
//If Temp.exists
if(temp.exists()){
bw = new BufferedWriter(new FileWriter(temp));

//Fetch all the lines from Orginal File
List<String> lines = Files.readAllLines(Paths.get(originalFile.getName()));

//Add to treemap
TreeMap<Integer,String> tm = new TreeMap<>();
for(int i=0;i<lines.size();i++){
tm.put(i,lines.get(i));
}

//To check first occurence of word in hashmap
for(int i=0;i<tm.size();i++){
String lastLine = tm.get(i);
tm.remove(i);
tm.put(i,lastLine.replaceFirst(from,to));
if(!lastLine.equals(tm.get(i)))
break;
}

//Write treemap to the text file
for(String line: tm.values())
bw.write(line.trim() + "\n");
System.out.println("First Occurence " + originalFile.getName()+ " changed");
bw.close();
originalFile.delete();
temp.renameTo(originalFile);
}else
System.out.println("Error in creating Temp.txt file");
}
}
}


Everything is working fine, the file is created. I dont think there is error in the code. Below is the MainTest.java

public class MainTest {

// Some utilities

private File createInputFile1() throws Exception {
File file1 = new File("Test.txt");
try (FileWriter fileWriter = new FileWriter(file1)) {
fileWriter.write("Dog is an animal");
}
return file1;
}

private String getFileContent(String filename) {
String content = null;
try {
content = new String(Files.readAllBytes(Paths.get(filename)));
} catch (IOException e) {
e.printStackTrace();
}
return content;
}

// Actual test cases
@Test
public void mainTest2() throws Exception {
File inputFile1 = createInputFile1();

String args[] = {"-f", "Dog", "Cat", "--", "Test.txt"};
Main.main(args);

String expected1 = "Cat is an animal".trim();

String actual1 = getFileContent("Test.txt");

assertEquals("The files differ!", expected1, actual1);
assertTrue(Files.exists(Paths.get(inputFile1.getPath() + ".bck")));
}

}


Everything works fine, file Test.txt is created and it has the text in it.
But I am facing this error of AssertionFailedError: The files differ! expected: Cat is an animal[] but was: Cat is an animal[ ]

Why does it differ [] and [ ] ?

Answer

Try this, shall help :

String expected1 = "Cat is an animal".trim();

String actual1 = getFileContent("Test.txt").trim();

assertEquals("The files differ!", expected1, actual1);
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