How to use replace method of io.kotest.property.arbitrary.StringShrinkerWithMin class

Best Kotest code snippet using io.kotest.property.arbitrary.StringShrinkerWithMin.replace

StringShrinkerWithMinTest.kt

Source:StringShrinkerWithMinTest.kt

...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> = """  `!"Â£$%^&*()_+=-[]{}:@~;'#<>?,./  """.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         }...

strings.kt

Source:strings.kt

...82 * Shrinks a string. Shrunk variants will be shorter and simplified.83 *84 * Shorter strings will be at least [minLength] in length.85 *86 * Simplified strings will have characters replaced by a character (selected by [simplestCharSelector])87 * of each pre-shrunk value. By default, this is the first character of the pre-shrunk string.88 *89 * When [simplestCharSelector] returns null, no simpler variants will be created.90 */91class StringShrinkerWithMin(92   private val minLength: Int = 0,93   private val simplestCharSelector: (preShrinkValue: String) -> Char? = CharSequence::firstOrNull94) : Shrinker<String> {95//   @Deprecated("a static 'simplestChar' means invalid shrinks can be generated - use the alternative constructor instead, which allows for a dynamic 'simplestChar'")96//   constructor (97//      minLength: Int = 0,98//      simplestChar: Char,99//   ) : this(minLength, { simplestChar })100   override fun shrink(value: String): List<String> {101      val simplestChar: Char? = simplestCharSelector(value)102      val isShortest = value.length == minLength103      val isSimplest = value.all { it == simplestChar }104      return buildList {105         if (!isShortest) {106            addAll(shorterVariants(value))107         }108         if (!isSimplest && simplestChar != null) {109            addAll(simplerVariants(value, simplestChar))110         }111      }.mapNotNull {112         // ensure the variants are at least minLength long113         when {114            simplestChar != null -> it.padEnd(minLength, simplestChar)115            it.length >= minLength -> it116            else -> null // this string is too short, so filter it out117         }118      }.distinct()119   }120   private fun simplerVariants(value: String, simplestChar: Char): List<String> =121      listOfNotNull(122         // replace the first and last chars that aren't simplestChar with simplestChar123         replace(value, simplestChar, value.indexOfFirst { it != simplestChar }),124         replace(value, simplestChar, value.indexOfLast { it != simplestChar }),125      )126   private fun shorterVariants(value: String) =127      listOf(128         value.take(value.length / 2 + value.length % 2),129         value.takeLast(value.length / 2),130         value.drop(1),131         value.dropLast(1),132      )133   private fun replace(value: String, newChar: Char, index: Int) =134      if (index == -1) null else value.replaceRange(index..index, newChar.toString())135}...

replace

Using AI Code Generation

1val shrinker = StringShrinkerWithMin(4)2shrinker.shrink("abcdef").joinToString() shouldBe "abcd"3shrinker.shrink("abcdefg").joinToString() shouldBe "abcd"4shrinker.shrink("abcdefgh").joinToString() shouldBe "abcd"5shrinker.shrink("abcdefghi").joinToString() shouldBe "abcd"6shrinker.shrink("abcdefghij").joinToString() shouldBe "abcd"7shrinker.shrink("abcdefghijk").joinToString() shouldBe "abcd"8shrinker.shrink("abcdefghijkl").joinToString() shouldBe "abcd"9shrinker.shrink("abcdefghijklm").joinToString() shouldBe "abcd"10shrinker.shrink("abcdefghijklmn").joinToString() shouldBe "abcd"11shrinker.shrink("abcdefghijklmno").joinToString() shouldBe "abcd"12shrinker.shrink("abcdefghijklmnop").joinToString() shouldBe "abcd"13shrinker.shrink("abcdefghijklmnopq").joinToString() shouldBe "abcd"14shrinker.shrink("abcdefghijklmnopqr").joinToString() shouldBe "abcd"15shrinker.shrink("abcdefghijklmnopqrs").joinToString() shouldBe "abcd"16shrinker.shrink("abcdefghijklmnopqrst").joinToString() shouldBe "abcd"17shrinker.shrink("abcdefghijklmnopqrstu").joinToString() shouldBe "abcd"18shrinker.shrink("abcdefghijklmnopqrstuv").joinToString() shouldBe "abcd"19shrinker.shrink("abcdefghijklmnopqrstuvw").joinToString() shouldBe "abcd"20shrinker.shrink("abcdefghijklmnopqrstuvwx").joinToString() shouldBe "abcd"21shrinker.shrink("abcdefghijklmnopqrstuvwxy").joinToString() shouldBe "abcd"22shrinker.shrink("abcdefghijklmnopqrstuvwxyz").joinToString

replace

Using AI Code Generation

1        val shrinker = StringShrinkerWithMin(10)2        val shrunk = shrinker.shrink("0123456789")3        val shrinker = StringShrinkerWithMin(10)4        val shrunk = shrinker.shrink("0123456789")5        val shrinker = StringShrinkerWithMin(10)6        val shrunk = shrinker.shrink("0123456789")7        val shrinker = StringShrinkerWithMin(10)8        val shrunk = shrinker.shrink("0123456789")9        val shrinker = StringShrinkerWithMin(10)10        val shrunk = shrinker.shrink("0123456789")11        val shrinker = StringShrinkerWithMin(10)12        val shrunk = shrinker.shrink("0123456789")13        val shrinker = StringShrinkerWithMin(10)14        val shrunk = shrinker.shrink("0123456789")15        val shrinker = StringShrinkerWithMin(10)16        val shrunk = shrinker.shrink("0123456789")

replace

Using AI Code Generation

1val shrunk = StringShrinkerWithMin(5).shrink("1234567")2val shrunk = StringShrinkerWithMin(5).shrink("12345678")3val shrunk = StringShrinkerWithMin(5).shrink("123456789")4val shrunk = StringShrinkerWithMin(5).shrink("1234567890")5val shrunk = StringShrinkerWithMin(5).shrink("12345678901")6val shrunk = StringShrinkerWithMin(5).shrink("123456789012")7val shrunk = StringShrinkerWithMin(5).shrink("1234567890123")8val shrunk = StringShrinkerWithMin(5).shrink("12345678901234")9val shrunk = StringShrinkerWithMin(5).shrink("123456789012345")10val shrunk = StringShrinkerWithMin(5).shrink("1234567890123456")11val shrunk = StringShrinkerWithMin(5).shrink("12345678901234567")12val shrunk = StringShrinkerWithMin(5).shrink("123456789012345678")13val shrunk = StringShrinkerWithMin(5).shrink("1234567890123456789")14val shrunk = StringShrinkerWithMin(5).shrink("12345678901234567890")15val shrunk = StringShrinkerWithMin(5).shrink("123456789012345678901")

replace

Using AI Code Generation

1val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )2        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )3val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )4        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )5val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )6        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )7val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )8        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )9val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )10        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )11val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )12        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )13val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )14        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )15val  stringShrinkerWithMin = StringShrinkerWithMin( 10 )16        val  shrunkString = stringShrinkerWithMin.shrink( "Hello World" )

replace

Using AI Code Generation

1val  stringShrinkerWithMin =  StringShrinkerWithMin ( min =  5 )2 stringShrinkerWithMin .replace( "kotest" ,  "kotest" )3val  stringShrinkerWithMin =  StringShrinkerWithMin ( min =  5 )4 stringShrinkerWithMin .replace( "kotest" ,  "kotest" ,  5 )5val  stringShrinkerWithMin =  StringShrinkerWithMin ( min =  5 )6 stringShrinkerWithMin .replace( "kotest" ,  "kotest" ,  4 )7val  stringShrinkerWithMin =  StringShrinkerWithMin ( min =  5 )8 stringShrinkerWithMin .replace( "kotest" ,  "kotest" ,  3 )9val  stringShrinkerWithMin =  StringShrinkerWithMin ( min =  5 )10 stringShrinkerWithMin .replace( "kotest" ,  "kotest" ,  2 )11val  stringShrinkerWithMin =  StringShrinkerWithMin ( min =  5 )12 stringShrinkerWithMin .replace( "kotest" ,  "kotest" ,  1 )

replace

Using AI Code Generation

1val  stringShrinkerWithMin = StringShrinkerWithMin()2val  actual = stringShrinkerWithMin.replace("Hello", "o")3}4}5val  stringShrinkerWithMin = StringShrinkerWithMin()6val  actual = stringShrinkerWithMin.shrink("Hello")7val  expected = listOf("Hell", "He", "H")

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