How to use String.middleChar method of com.sksamuel.kotest.property.shrinking.StringShrinkerWithMinTest class

Best Kotest code snippet using com.sksamuel.kotest.property.shrinking.StringShrinkerWithMinTest.String.middleChar

StringShrinkerWithMinTest.kt

Source:StringShrinkerWithMinTest.kt Github

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1package com.sksamuel.kotest.property.shrinking2import io.kotest.assertions.shouldFail3import io.kotest.assertions.withClue4import io.kotest.core.spec.style.DescribeSpec5import io.kotest.extensions.system.captureStandardOut6import io.kotest.inspectors.forAll7import io.kotest.inspectors.forAtLeastOne8import io.kotest.matchers.collections.shouldBeIn9import io.kotest.matchers.collections.shouldContain10import io.kotest.matchers.comparables.shouldBeLessThan11import io.kotest.matchers.shouldBe12import io.kotest.matchers.string.shouldContain13import io.kotest.matchers.string.shouldContainOnlyDigits14import io.kotest.matchers.string.shouldHaveLength15import io.kotest.matchers.string.shouldMatch16import io.kotest.matchers.string.shouldNotContain17import io.kotest.property.Arb18import io.kotest.property.PropTestConfig19import io.kotest.property.PropertyTesting20import io.kotest.property.RTree21import io.kotest.property.ShrinkingMode22import io.kotest.property.arbitrary.ArbitraryBuilder23import io.kotest.property.arbitrary.Codepoint24import io.kotest.property.arbitrary.StringShrinkerWithMin25import io.kotest.property.arbitrary.arbitrary26import io.kotest.property.arbitrary.ascii27import io.kotest.property.arbitrary.az28import io.kotest.property.arbitrary.char29import io.kotest.property.arbitrary.of30import io.kotest.property.arbitrary.string31import io.kotest.property.checkAll32import io.kotest.property.internal.doShrinking33import io.kotest.property.rtree34class StringShrinkerWithMinTest : DescribeSpec({35   beforeSpec {36      PropertyTesting.shouldPrintShrinkSteps = false37   }38   afterSpec {39      PropertyTesting.shouldPrintShrinkSteps = true40   }41   describe("StringShrinkerWithMin") {42      it("should include bisected input") {43         checkAll { a: String ->44            if (a.length > 1) {45               val candidates = StringShrinkerWithMin().shrink(a)46               candidates.forAtLeastOne {47                  it.shouldHaveLength(a.length / 2 + a.length % 2)48               }49               candidates.forAtLeastOne {50                  it.shouldHaveLength(a.length / 2)51               }52            }53         }54      }55      it("should use first char to replace the second char") {56         StringShrinkerWithMin(4).shrink("atttt") shouldContain "aattt"57      }58      it("should replace last char with simplest") {59         StringShrinkerWithMin(4).shrink("atttt") shouldContain "attta"60      }61      it("should drop first char") {62         StringShrinkerWithMin(4).shrink("abcde") shouldContain "bcde"63      }64      it("should drop last char") {65         StringShrinkerWithMin(4).shrink("abcde") shouldContain "abcd"66      }67      it("should include first half variant") {68         StringShrinkerWithMin(1).shrink("abcdef") shouldContain "abc"69         StringShrinkerWithMin(1).shrink("abcde") shouldContain "abc"70      }71      it("should include second half variant") {72         StringShrinkerWithMin(1).shrink("abcdef") shouldContain "def"73         StringShrinkerWithMin(1).shrink("abcd") shouldContain "cd"74      }75      it("should shrink to expected value") {76         val prt = PropertyTesting.shouldPrintShrinkSteps77         PropertyTesting.shouldPrintShrinkSteps = false78         checkAll<String> { a ->79            val shrinks = StringShrinkerWithMin().rtree(a)80            val shrunk = doShrinking(shrinks, ShrinkingMode.Unbounded) {81               it.shouldNotContain("#")82            }83            if (a.contains("#")) {84               shrunk.shrink shouldBe "#"85            } else {86               shrunk.shrink shouldBe a87            }88         }89         PropertyTesting.shouldPrintShrinkSteps = prt90      }91      it("should prefer padded values") {92         val prt = PropertyTesting.shouldPrintShrinkSteps93         PropertyTesting.shouldPrintShrinkSteps = false94         val a = "97asd!@#ASD'''234)*safmasd"95         val shrinks = StringShrinkerWithMin().rtree(a)96         doShrinking(shrinks, ShrinkingMode.Unbounded) {97            it.length.shouldBeLessThan(3)98         }.shrink shouldBe "777"99         doShrinking(shrinks, ShrinkingMode.Unbounded) {100            it.length.shouldBeLessThan(8)101         }.shrink shouldBe "!!!!!!!!"102         PropertyTesting.shouldPrintShrinkSteps = prt103      }104      it("should respect min value") {105         val prt = PropertyTesting.shouldPrintShrinkSteps106         PropertyTesting.shouldPrintShrinkSteps = true107         val stdout = captureStandardOut {108            shouldFail {109               checkAll(PropTestConfig(seed = 123125), Arb.string(4, 8)) { a ->110                  // will cause the value to fail and shrinks be used, but nothing should be shrunk111                  // past the min value of 4, even though we fail on anything >= 2112                  a.shouldHaveLength(1)113               }114            }115         }116         stdout.shouldContain(117            """118Attempting to shrink arg "`a,ONF/b"119Shrink #1: "`a,O" fail120Shrink #2: "``,O" fail121Shrink #3: "```O" fail122Shrink #4: "````" fail123Shrink result (after 4 shrinks) => "````"124            """.trim()125         )126         PropertyTesting.shouldPrintShrinkSteps = prt127      }128      it("should generate samples that only contain numbers, given a numeric-codepoints Arb") {129         val numericChars = '0'..'9'130         val arbNumericCodepoints = Arb.of(numericChars.map { Codepoint(it.code) })131         val arbNumericString = Arb.string(1..10, arbNumericCodepoints)132         checkAll(arbNumericString) { numericString ->133            StringShrinkerWithMin()134               .shrink(numericString)135               .forAll { it.shouldContainOnlyDigits() }136         }137      }138      it("should only generate codepoint-compatible samples, when an Arb.string() is created") {139         val arbCharacters: Set<Char> = """  `!"£$%^&*()_+=-[]{}:@~;'#<>?,./  """.trim().toSet()140         val arbNumericCodepoints = Arb.of(arbCharacters.map { Codepoint(it.code) })141         val stringArb = Arb.string(minSize = 4, maxSize = 10, codepoints = arbNumericCodepoints)142         val arbSamples = arbitrary { rs -> stringArb.sample(rs) }143         checkAll(arbSamples) { sample ->144            withClue("all samples should only contain chars used to create the Arb.string(): $arbCharacters") {145               sample.value.toList().forAll { it.shouldBeIn(arbCharacters) }146               sample.shrinks.children.value.forAll { child: RTree<String> ->147                  child.value().toList().forAll { it.shouldBeIn(arbCharacters) }148               }149            }150         }151      }152      it("should generate simpler variants using simplestCharSelector") {153         val azStringArb = Arb.string(minSize = 10, maxSize = 10, Codepoint.az())154         val digitsArb = Arb.char('0'..'9')155         checkAll(azStringArb, digitsArb) { preShrinkString, digitChar ->156            val stringShrinker = StringShrinkerWithMin(minLength = 10) { digitChar }157            stringShrinker.shrink(preShrinkString).forAll { shrunkString ->158               shrunkString shouldHaveLength 10159               shrunkString shouldMatch Regex("[a-zA-Z$digitChar]{10}")160            }161         }162      }163      it("should not generate simpler variants when simplestCharSelector returns null") {164         val stringArb = Arb.string(minSize = 1, maxSize = 10, Codepoint.ascii())165         val stringShrinker = StringShrinkerWithMin(minLength = 1) { null }166         checkAll(stringArb) { preShrinkString ->167            stringShrinker.shrink(preShrinkString).forAll { shrunkString ->168               shrunkString shouldHaveLength shrunkString.length169            }170         }171      }172      it("should generate simpler variants using custom simplestCharSelector") {173         fun String.middleChar(): Char? = getOrNull(length / 2)174         val stringShrinker = StringShrinkerWithMin(minLength = 10) { it.middleChar() }175         val stringArbWithShrinker = ArbitraryBuilder.create {176            // '#' is the middle char - expect the '_' chars to be replaced by '#'177            "_____#_____"178         }.withShrinker(stringShrinker)179            .build()180         val prt = PropertyTesting.shouldPrintShrinkSteps181         PropertyTesting.shouldPrintShrinkSteps = true182         val stdout = captureStandardOut {183            shouldFail {184               checkAll(PropTestConfig(seed = 123125), stringArbWithShrinker) { a ->185                  // will cause the value to fail and shrinks be used, but nothing should be shrunk186                  // past the min value of 4, even though we fail on anything >= 2187                  a.shouldHaveLength(1)188               }189            }190         }191         stdout.shouldContain(192            """193Attempting to shrink arg "_____#_____"194Shrink #1: "_____#####" fail195Shrink #2: "#____#####" fail196Shrink #3: "##___#####" fail197Shrink #4: "###__#####" fail198Shrink #5: "####_#####" fail199Shrink #6: "##########" fail200Shrink result (after 6 shrinks) => "##########"201            """.trim()202         )203         PropertyTesting.shouldPrintShrinkSteps = prt204      }205      it("should generate simpler variants using dynamic simplestCharSelector") {206         // dynamically select the simplest char - it should be the char after the last space207         val stringShrinker = StringShrinkerWithMin(minLength = 10) {208            val lastSpaceCharIndex = it.indexOfLast { c -> c == ' ' }209            it.getOrNull(lastSpaceCharIndex + 1)210         }211         val stringArbWithShrinker = ArbitraryBuilder.create {212            "a b c d e f g h i j k"213         }.withShrinker(stringShrinker)214            .build()215         val prt = PropertyTesting.shouldPrintShrinkSteps216         PropertyTesting.shouldPrintShrinkSteps = true217         val stdout = captureStandardOut {218            shouldFail {219               checkAll(PropTestConfig(seed = 123125), stringArbWithShrinker) { a ->220                  // will cause the value to fail and shrinks be used, but nothing should be shrunk221                  // past the min value of 4, even though we fail on anything >= 2222                  a.shouldHaveLength(1)223               }224            }225         }226         stdout.shouldContain(227            """228Attempting to shrink arg "a b c d e f g h i j k"229Shrink #1: "a b c d e f" fail230Shrink #2: "a b c ffff" fail231Shrink #3: "f b c ffff" fail232Shrink #4: "ffb c ffff" fail233Shrink #5: "fff c ffff" fail234Shrink #6: "ffffc ffff" fail235Shrink #7: "fffff ffff" fail236Shrink #8: "ffffffffff" fail237Shrink result (after 8 shrinks) => "ffffffffff"238            """.trim()239         )240         PropertyTesting.shouldPrintShrinkSteps = prt241      }242   }243})...

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String.middleChar

Using AI Code Generation

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1    StringShrinkerWithMinTest().middleChar()2    StringShrinkerWithMinTest.middleChar()3    StringShrinkerWithMinTest.middleChar()4    StringShrinkerWithMinTest.middleChar()5    StringShrinkerWithMinTest.middleChar()6    StringShrinkerWithMinTest.middleChar()7    StringShrinkerWithMinTest.middleChar()8    StringShrinkerWithMinTest.middleChar()9    StringShrinkerWithMinTest.middleChar()10    StringShrinkerWithMinTest.middleChar()11    StringShrinkerWithMinTest.middleChar()

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String.middleChar

Using AI Code Generation

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1val middleChar = str.middleChar()2println(middleChar)3val middleChar = str.middleChar()4println(middleChar)5val middleChar = str.middleChar()6println(middleChar)7val middleChar = str.middleChar()8println(middleChar)9val middleChar = str.middleChar()10println(middleChar)11val middleChar = str.middleChar()12println(middleChar)13val middleChar = str.middleChar()14println(middleChar)15val middleChar = str.middleChar()16println(middleChar)17val middleChar = str.middleChar()18println(middleChar)19val middleChar = str.middleChar()20println(middleChar)

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String.middleChar

Using AI Code Generation

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1    val result = StringShrinkerWithMinTest().middleChar("abc")2    assertEquals(result, "b")3    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (5, 1): Expecting a top level declaration4    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (6, 1): Expecting a top level declaration5    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (7, 1): Expecting a top level declaration6    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (8, 1): Expecting a top level declaration7    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (9, 1): Expecting a top level declaration8    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (10, 1): Expecting a top level declaration9    e: C:\Users\moham\Desktop\kotest\src\test\kotlin\com\sksamuel\kotest\property\shrinking\StringShrinkerWithMinTest.kt: (11, 1): Expecting a top level declaration

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