JUnit assertions : make the assertion between floats

java junit junit4
lola picture lola · Sep 26, 2011 · Viewed 40.8k times · Source

I need to compare two values : one a string and the other is float so I convert the string to float then try to call assertEquals(val1,val2) but this is not authorized , I guess that the assertEquals doesn't accept float as arguments.

What is the solution for me in this case ?

Answer

oers picture oers · Sep 26, 2011

You have to provide a delta to the assertion for Floats:

Assert.assertEquals(expected, actual, delta)

While delta is the maximum difference (delta) between expected and actual for which both numbers are still considered equal.

Assert.assertEquals(0.0012f, 0.0014f, 0.0002); // true
Assert.assertEquals(0.0012f, 0.0014f, 0.0001); //false

Related questions

How do you assert that a certain exception is thrown in JUnit 4 tests?

How can I use JUnit4 idiomatically to test that some code throws an exception? While I can certainly do something like this: @Test public void testFooThrowsIndexOutOfBoundsException() { boolean thrown = false; try { foo.doStuff(); } catch (IndexOutOfBoundsException e) { thrown = true; } assertTrue(thrown); } I …

Read More
How to run test methods in specific order in JUnit4?

I want to execute test methods which are annotated by @Test in specific order. For example: public class MyTest { @Test public void test1(){} @Test public void test2(){} } I want to ensure to run test1() before test2() each time I run …

Read More
Java/ JUnit - AssertTrue vs AssertFalse

I'm pretty new to Java and am following the Eclipse Total Beginner's Tutorials. They are all very helpful, but in Lesson 12, he uses assertTrue for one test case and assertFalse for another. Here's the code: // Check the book out to …

Read More