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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