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First time writing junit: Need suggestions


By : Kristian Davidsen
Date : August 02 2020, 07:00 AM
fixed the issue. Will look into that further As a rule of thumb, this about tests like a tool that is here to help you the programmer to make sure that the code you wrote behaves as expected.
With this in mind, what are the inputs you would like to test so that you could be sure that your code works?
code :


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Suggestions for writing a programming language?


By : Jake Cattrall
Date : March 29 2020, 07:55 AM
Hope this helps Estimating how long something like that might take is dependent on many different factors. For example, an experienced programmer can easily knock out a simple arithmetic expression evaluator in a couple of hours, with unit tests. But a novice programmer may have to learn about parsing techniques, recursive descent, abstract representation of expression trees, tree-walking strategies, and so on. This could easily take weeks or more, just for arithmetic expressions.
However, don't let that discourage you. As Jeff and Joel were discussing with Eric Sink on a recent Stack Overflow podcast, writing a compiler is an excellent way to learn about many different aspects of programming. I've built a few compilers and they are among my most memorable programming projects.

need suggestions on getting started with Junit


By : user1550209
Date : March 29 2020, 07:55 AM
this one helps. I have not used Junit before and have not done unit testing automatically. , You'll write a test class.
code :
public class OracleMatchesSqlServer extends TestCase {
    public void testHeadIdentifiersShouldBeEqual() throws Exception {
        String head = "whatever your head should be";
        IdentifierBean originalBean = YourClass.getHeadIdentifiers_old(head);
        IdentifierBean oracleBean = YourClass.getHeadIdentifiers(head);
        assertEquals(originalBean, oracleBean);
    }
}
public class OracleMatchesSqlServer extends TestCase {
    public void testHeadIdentifiersShouldBeEqual() throws Exception {
        compareIdentifiersWithHead("head1");
        compareIdentifiersWithHead("head2");
        compareIdentifiersWithHead("etc");
    }
    private static void compareIdentifiersWithHead(String head) {
        IdentifierBean originalBean = YourClass.getHeadIdentifiers_old(head);
        IdentifierBean oracleBean = YourClass.getHeadIdentifiers(head);
        assertEquals(originalBean, oracleBean);
    }
}
* Is this a good approach?
* I will have multiple DAOs. Do I write the test methods inside the DAO
  itself or for each DAO I should have a separate JUnit Test Class?
* (might be n00b question) will all the test cases be run automatically?
  I do not want to go to the front end click bunch of stuff so that call
  to the DAO gets triggered.
* when tests are ran will I find out which methods failed? 
  and for the ones failed will it tell me the test method that failed?
* lastly, any good starting points? any tutorials, articles that
  show working with Junit

Need suggestions for writing an optimized SQL query


By : Mário Sliepoi Rutman
Date : March 29 2020, 07:55 AM
wish helps you I am trying to frame an SQL in informix /Postgres.
code :
SELECT j.* 
FROM Job AS j
  JOIN JobType AS jt
    ON jt.id = j.type_id
WHERE jt.code = 'CRT'
  AND NOT EXISTS
      ( SELECT 1
        FROM Job AS p
          JOIN JobType AS pjt
            ON pjt.id = p.type_id 
        WHERE p.user_description = pjt.description || '-' || j.user_description
          AND pjt.code LIKE 'PST%'
      ) ;

Doubts and suggestions about JUnit


By : SungHyuk Choi
Date : March 29 2020, 07:55 AM
will be helpful for those in need Writing a unit test is easy in JUnit4: Write some small methods that use your code, and use JUnit assertions to ensure that your code produces the answers you're expecting.
code :
@RunWith(JUnit4.class) // JUnit4.class is a "runner".
public class BinarySearchTest {
  // By convention, the test for class Foo is named FooTest. You can name the
  // test anything you'd like, though, especially if you split your test for
  // Foo into more than one file.

  @Test public void isSortedShouldReturnTrueWhenSorted() { // Same with methods.
    assertTrue(BinarySearch.isSorted(new int[] { 2, 4, 6 }));
  }

  @Test public void isSortedShouldReturnFalseWhenUnsorted() {
    assertFalse(BinarySearch.isSorted(new int[] { 4, 2, 6 }));
  }

  @Test public void isSortedShouldReturnTrueWhenEmpty() {
    assertTrue(BinarySearch.isSorted(new int[] {}));
  }

  // Write more tests here!
}
java -cp /usr/share/java/junit.jar org.junit.runner.JUnitCore your.package.BinarySearchTest
#    ^ classpath includes JUnit    ^ you're running JUnitCore ^ on your test class

Powermock JUnit tests are taking more time to execute compared to normal JUnit


By : Ted Henderson
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , PowerMock is a tool that performs bytecode instrumentation on your generated classes. Once your classes are compiled into Java Bytecode, PowerMock comes along and modifies this generated classes. It is not possible otherwise (by using Java Proxy) to mock a private or a static method.
You should only use @PrepareForTest annotation only in those classes that you want to use features exclusive to PowerMock, such as mocking private or static methods.
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