CODEWITHSUNDEEP
javajunit
daydreamer
daydreamer

Reputation: 91949

Java: Can not read data file in JUnit test

my test package looks like

test/
    java/
        com/
           algos/
                graphs/
                      GraphTest.java
    resources/
             graphs/
                   tinyG.txt

The GraphTest tried to read tinyG as follows

@Test
public void testTinyG() throws IOException {
    final Graph g = new Graph(getBufferedReaderFor("tinyG.txt"));
    System.out.println(g.toString());
}

private static BufferedReader getBufferedReaderFor(final String filename) {
    return new BufferedReader(new InputStreamReader(GraphTest.class.getResourceAsStream("/graphs/" + filename)));
}

It fails with NullPointerException as 

GraphTest.class.getResourceAsStream("/graphs/" + filename)

returns null.

What is that I am doing wrong here?

tinyG has data like

13
13
0 5
4 3
0 1
9 12
6 4
5 4
0 2

Thank you

Upvotes: 1

Views: 1584

Answers (1)

Zagrev
Zagrev

Reputation: 2020

When Eclipse runs JUnit tests for a project, it normally starts the tests using the working directory of the project. So, to access tinyG.txt from the classpath, you would have to use the path /test/resources/graphs/tinyG.txt. The only way to have tinyG.txt work would for it to reside in the same directory as the .class file.

Upvotes: 2

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