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https://issues.apache.org/jira/browse/MATH-658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yannick TANGUY updated MATH-658:
--------------------------------
Attachment: FastMathTest.java
This class contains some new tests to improve test coverage
> Dead code in FastMath.pow(double, double) and some improvement in test
> coverage
> -------------------------------------------------------------------------------
>
> Key: MATH-658
> URL: https://issues.apache.org/jira/browse/MATH-658
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Yannick TANGUY
> Priority: Minor
> Fix For: 3.0
>
> Attachments: FastMathTest.java
>
>
> This issue concerns the FastMath class and its test class.
> I don't know how to attach source code to an issue : sorry if it's not easy
> to read...
> (1) In the double pow(double, double) function, there are 2 identical "if"
> blocks. The second one can be suppressed.
> if (y < 0 && y == yi && (yi & 1) == 1) {
> return Double.NEGATIVE_INFINITY;
> }
> // this block is never used -> to be suppressed
> if (y < 0 && y == yi && (yi & 1) == 1) {
> return -0.0;
> }
> if (y > 0 && y == yi && (yi & 1) == 1) {
> return -0.0;
> }
> (2) To obtain better code coverage, we added some tests case in
> FastMathTest.java :
> /**
> * Added test for log1p
> */
> @Test
> public void testLog1pSpecialCases() {
> double x;
>
> x = FastMath.log1p(-1.0);
> if (x != Double.NEGATIVE_INFINITY)
> throw new RuntimeException("Log1p of -1 should be -infinity");
> }
> public void testPowSpecialCases() {
>
> // [ ... ]
> // Added tests for a 100% coverage
>
> x = FastMath.pow(Double.POSITIVE_INFINITY, Double.NaN);
> if (x == x)
> throw new RuntimeException("pow(+Inf, NaN) should be NaN");
>
> x = FastMath.pow(Double.POSITIVE_INFINITY, Double.NaN);
> if (x == x)
> throw new RuntimeException("pow(+Inf, NaN) should be NaN");
>
> x = FastMath.pow(1.0, Double.POSITIVE_INFINITY);
> if (x == x)
> throw new RuntimeException("pow(1.0, +Inf) should be NaN");
>
> x = FastMath.pow(Double.NEGATIVE_INFINITY, Double.NaN);
> if (x == x)
> throw new RuntimeException("pow(-Inf, NaN) should be NaN");
>
> x = FastMath.pow(Double.NEGATIVE_INFINITY, -1.0);
> if (x != -0.0)
> throw new RuntimeException("pow(-Inf, -1.0) should be 0.0");
>
> x = FastMath.pow(Double.NEGATIVE_INFINITY, -2.0);
> if (x != 0.0)
> throw new RuntimeException("pow(-Inf, -2.0) should be 0.0");
>
> x = FastMath.pow(Double.NEGATIVE_INFINITY, 1.0);
> if (x != Double.NEGATIVE_INFINITY)
> throw new RuntimeException("pow(-Inf, 1.0) should be -Inf");
>
> x = FastMath.pow(Double.NEGATIVE_INFINITY, 2.0);
> if (x != Double.POSITIVE_INFINITY)
> throw new RuntimeException("pow(-Inf, 2.0) should be +Inf");
> x = FastMath.pow(1.0, Double.NEGATIVE_INFINITY);
> if (x == x)
> throw new RuntimeException("pow(1.0, -Inf) should be NaN");
> }
>
> /**
> * Added tests for a 100% coverage of acos().
> */
> @Test
> public void testAcosSpecialCases() {
> double x;
> x = FastMath.acos(Double.NaN);
> if (x == x)
> throw new RuntimeException("acos(NaN) should NaN");
> x = FastMath.acos(-1.1);
> if (x == x)
> throw new RuntimeException("acos(-1.1) should NaN");
>
> x = FastMath.acos(1.1);
> if (x == x)
> throw new RuntimeException("acos(-1.1) should NaN");
>
> assertEquals(FastMath.acos(-1.0), FastMath.PI, Double.MIN_VALUE);
> assertEquals(FastMath.acos(1.0), 0.0, Double.MIN_VALUE);
> assertEquals(FastMath.acos(0.0), FastMath.PI / 2.0, Double.MIN_VALUE);
> }
>
> /**
> * Added tests for a 100% coverage of asin().
> */
> @Test
> public void testAsinSpecialCases() {
> double x;
> x = FastMath.asin(Double.NaN);
> if (x == x)
> throw new RuntimeException("asin(NaN) should NaN");
> x = FastMath.asin(-1.1);
> if (x == x)
> throw new RuntimeException("asin(-1.1) should NaN");
>
> x = FastMath.asin(1.1);
> if (x == x)
> throw new RuntimeException("asin(-1.1) should NaN");
>
> assertEquals(FastMath.asin(1.0), FastMath.PI / 2.0, Double.MIN_VALUE);
> assertEquals(FastMath.asin(-1.0), -FastMath.PI / 2.0, Double.MIN_VALUE);
> assertEquals(FastMath.asin(0.0), 0.0, Double.MIN_VALUE);
> }
>
>
>
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