Update RationalTest.java

[stamatisn]

Fixes (#2823)
Now the testRaiseARealNumberToAPositiveRationalNumber() test gets passed.

pull request

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[stamatisn]

Fixed bug (#2823) Now the testRaiseARealNumberToAPositiveRationalNumber() test gets passed.
no important files changed

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[kahgoh]

Looking at the AssertJ examples, I was wondering if this is what you meant?

Suggested change

	assertThat(x, closeTo(y, within (DOUBLE_EQUALITY_TOLERANCE));
	assertThat(x).isCloseTo(y, within(DOUBLE_EQUALITY_TOLERANCE));

Otherwise this doesn't compile:

/home/runner/work/java/java/exercises/practice/rational-numbers/src/test/java/RationalTest.java:14: error: ')' expected
> Task :practice:rational-numbers:compileStarterSourceJava
        assertThat(x, closeTo(y, within (DOUBLE_EQUALITY_TOLERANCE));

[stamatisn]

Yes this is what I meant to write. I opened another pull request (#2887) and I uploaded the corrected code