How to use testVariance method of io.kotest.matchers.stats.matchers class

...330      {331         "Collection should not have mean $expected but was $actual"332      })333}334private fun <T : Number> testVariance(335   collection: Collection<T>,336   expectedValue: BigDecimal,337   precision: Int338): MatcherResult {339   val expected = expectedValue.stripTrailingZeros()340   val actual = if (collection.isEmpty()) BigDecimal.ZERO else calculateVariance(collection).round(precision)341   return MatcherResult(342      expected.compareTo(actual) == 0,343      { "Collection should have variance $expected but was $actual" },344      {345         "Collection should not have variance $expected but was $actual"346      })347}348private fun <T : Number> testStandardDeviation(349   collection: Collection<T>,350   expectedValue: BigDecimal,351   precision: Int352): MatcherResult {353   val expected = expectedValue.stripTrailingZeros()354   val actual = if (collection.isEmpty()) BigDecimal.ZERO else calculateStandardDeviation(collection).round(precision)355   return MatcherResult(356      expected.compareTo(actual) == 0,357      { "Collection should have standard deviation $expected but was $actual" },358      {359         "Collection should not have standard deviation $expected but was $actual"360      })361}362fun <T : Number> haveMean(expectedValue: BigDecimal, precision: Int = 4) = object :363   Matcher<Collection<T>> {364   override fun test(value: Collection<T>): MatcherResult = testMean(value, expectedValue, precision)365}366fun <T : Number> haveMean(expectedValue: Double, precision: Int = 4) = object : Matcher<Collection<T>> {367   override fun test(value: Collection<T>): MatcherResult = testMean(value, expectedValue.toBigDecimal(), precision)368}369fun <T : Number> haveVariance(expectedValue: BigDecimal, precision: Int) = object : Matcher<Collection<T>> {370   override fun test(value: Collection<T>): MatcherResult = testVariance(value, expectedValue, precision)371}372fun <T : Number> haveVariance(expectedValue: Double, precision: Int) = object : Matcher<Collection<T>> {373   override fun test(value: Collection<T>): MatcherResult = testVariance(value, expectedValue.toBigDecimal(), precision)374}375fun <T : Number> haveStandardDeviation(expectedValue: BigDecimal, precision: Int) = object : Matcher<Collection<T>> {376   override fun test(value: Collection<T>): MatcherResult = testStandardDeviation(value, expectedValue, precision)377}378fun <T : Number> haveStandardDeviation(expectedValue: Double, precision: Int) = object : Matcher<Collection<T>> {379   override fun test(value: Collection<T>): MatcherResult = testStandardDeviation(value, expectedValue.toBigDecimal(), precision)380}...

1testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 ) shouldBe 2.02testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 , 6.0 ) shouldBe 3.53testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 , 6.0 , 7.0 ) shouldBe 4.54testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 , 6.0 , 7.0 , 8.0 ) shouldBe 5.255testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 , 6.0 , 7.0 , 8.0 , 9.0 ) shouldBe 6.06testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 , 6.0 , 7.0 , 8.0 , 9.0 , 10.0 ) shouldBe 7.57testVariance ( 1.0 , 2.0 , 3.0 , 4.0 , 5.0 , 6.0 , 7.0 , 8.0 , 9.0 , 10.0 , 11.0 ) shouldBe 8.258testVariance ( 1.0

1testVariance(1.0, 2.0, 3.0, 4.0) shouldBe 1.252testVariance(1.0, 2.0, 3.0, 4.0) shouldBeLessThan 2.03testVariance(1.0, 2.0, 3.0, 4.0) shouldBeGreaterThan 0.54testVariance(1.0, 2.0, 3.0, 4.0) shouldBeInRange 0.5..2.05testVariance(1.0, 2.0, 3.0, 4.0) shouldBeIn 0.5..2.06testVariance(1.0, 2.0, 3.0, 4.0) shouldNotBeIn 0.0..0.57testVariance(1.0, 2.0, 3.0, 4.0) shouldNotBeIn 2.0..3.08testVariance(1.0, 2.0, 3.0, 4.0) shouldNotBeInRange 0.0..0.59testVariance(1.0, 2.0, 3.0, 4.0) shouldNotBeInRange 2.0..3.010testVariance(1.0, 2.0, 3.0, 4.0) shouldBe 1.25 +- 0.0111testVariance(1.0, 2.0, 3.0, 4.0) shouldNotBe 1.25 +- 0.0112testVariance(1.0, 2.0, 3.0, 4.0) shouldBe 1.25 +- 0.0113testVariance(1.0, 2.0, 3.0, 4.0) shouldNotBe 1.25 +- 0.0114testVariance(1.0, 2.0, 3.0, 4.0) shouldBe 1.25 +- 0.0115testVariance(1.0, 2.0, 3.0, 4.0

1    testVariance("testVariance", 1.0, 1.0, 0.0)2    testVariance("testVariance", 1.0, 2.0, 0.5)3    testVariance("testVariance", 1.0, 3.0, 1.0)4    testVariance("testVariance", 1.0, 4.0, 1.5)5    testVariance("testVariance", 1.0, 5.0, 2.0)6    testVariance("testVariance", 1.0, 6.0, 2.5)7    testVariance("testVariance", 1.0, 7.0, 3.0)8    testVariance("testVariance", 1.0, 8.0, 3.5)9    testVariance("testVariance", 1.0, 9.0, 4.0)10    testVariance("testVariance", 1.0, 10.0, 4.5)11    testVariance("testVariance", 1.0, 11.0, 5.0)12    testVariance("testVariance", 1.0, 12.0, 5.5)13    testVariance("testVariance", 1.0, 13.0, 6.0)14    testVariance("testVariance", 1.0, 14.0, 6.5)15    testVariance("testVariance", 1.0, 15.0, 7.0)16    testVariance("testVariance", 1.0, 16.0, 7.5)17    testVariance("testVariance", 1.0, 17.0, 8.0)18    testVariance("testVariance", 1.0, 18.0, 8.5)19    testVariance("testVariance", 1.0, 19.0, 9.0)20    testVariance("testVariance", 1.0, 20.0, 9.5)21    testVariance("testVariance", 1.0, 21.0

1        testVariance(1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0)2        testVariance(1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)3        testVariance(1.0, 2.0, 1.0, 1.0, 2.0, 1.0, 1.0)4        testVariance(1.0, 3.0, 1.0, 1.0, 2.0, 1.0, 1.0)5        testVariance(1.0, 4.0, 1.0, 1.0, 2.0, 1.0, 1.0)6        testVariance(1.0, 5.0, 1.0, 1.0, 2.0, 1.0, 1.0)7        testVariance(1.0, 6.0, 1.0, 1.0, 2.0, 1.0, 1.0)8    }9}

1testVariance ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )2testVariance ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )3testStandardDeviation ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )4testStandardDeviation ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )5testStandardError ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )6testStandardError ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )7testSkewness ( 0.0 , 1.0 , 2.0 , 3.0 , 4.0 )