How to use haveSizeMatcher method of io.kotest.matchers.collections.size class

Best Kotest code snippet using io.kotest.matchers.collections.size.haveSizeMatcher

CollectionMatchers.kt

Source: CollectionMatchers.kt Github

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2import io.kotest.assertions.show.show3import io.kotest.matchers.Matcher4import io.kotest.matchers.MatcherResult5import io.kotest.matchers.neverNullMatcher6fun <T> haveSizeMatcher(size: Int) = object : Matcher<Collection<T>> {7 override fun test(value: Collection<T>) =8 MatcherResult(9 value.size == size,10 { "Collection should have size $size but has size ${value.size}. Values: ${value.show().value}" },11 { "Collection should not have size $size. Values: ${value.show().value}" }12 )13}14fun <T> beEmpty(): Matcher<Collection<T>> = object : Matcher<Collection<T>> {15 override fun test(value: Collection<T>): MatcherResult = MatcherResult(16 value.isEmpty(),17 { "Collection should be empty but contained ${value.show().value}" },18 { "Collection should not be empty" }19 )20}21fun <T> existInOrder(vararg ps: (T) -> Boolean): Matcher<Collection<T>?> = existInOrder(ps.asList())22/​**23 * Assert that a collections contains a subsequence that matches the given subsequence of predicates, possibly with24 * values in between.25 */​26fun <T> existInOrder(predicates: List<(T) -> Boolean>): Matcher<Collection<T>?> = neverNullMatcher { actual ->27 require(predicates.isNotEmpty()) { "predicates must not be empty" }28 var subsequenceIndex = 029 val actualIterator = actual.iterator()30 while (actualIterator.hasNext() && subsequenceIndex < predicates.size) {31 if (predicates[subsequenceIndex](actualIterator.next())) subsequenceIndex += 132 }33 MatcherResult(34 subsequenceIndex == predicates.size,35 { "${actual.show().value} did not match the predicates ${predicates.show().value} in order" },36 { "${actual.show().value} should not match the predicates ${predicates.show().value} in order" }37 )38}39fun <T> haveSize(size: Int): Matcher<Collection<T>> = haveSizeMatcher(size)40fun <T> singleElement(t: T): Matcher<Collection<T>> = object : Matcher<Collection<T>> {41 override fun test(value: Collection<T>) = MatcherResult(42 value.size == 1 && value.first() == t,43 { "Collection should be a single element of $t but has ${value.size} elements: ${value.show().value}" },44 { "Collection should not be a single element of $t" }45 )46}47fun <T> singleElement(p: (T) -> Boolean): Matcher<Collection<T>> = object : Matcher<Collection<T>> {48 override fun test(value: Collection<T>): MatcherResult {49 val filteredValue: List<T> = value.filter(p)50 return MatcherResult(51 filteredValue.size == 1,52 { "Collection should have a single element by a given predicate but has ${filteredValue.size} elements: ${value.show().value}" },53 { "Collection should not have a single element by a given predicate" }...

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size.kt

Source: size.kt Github

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...97 {98 "Collection ${value.print().value} should contain more than $n elements"99 })100}101fun <T> haveSizeMatcher(size: Int) = object : Matcher<Collection<T>> {102 override fun test(value: Collection<T>) =103 MatcherResult(104 value.size == size,105 { "Collection should have size $size but has size ${value.size}. Values: ${value.print().value}" },106 { "Collection should not have size $size. Values: ${value.print().value}" }107 )108}...

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haveSizeMatcher

Using AI Code Generation

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1 it("should have size of 2") {2 val list = listOf("a", "b")3 list should haveSizeMatcher(2)4 }5 it("should have size of 2") {6 val list = listOf("a", "b")7 list should haveSize(2)8 }9 }10}

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haveSizeMatcher

Using AI Code Generation

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1 val list = mutableListOf(1, 2, 3, 4, 5)2 list should haveSize(5)3 list shouldNot haveSize(4)4 }5 fun `should have size greater than`() {6 val list = mutableListOf(1, 2, 3, 4, 5)7 list should haveSizeGreaterThan(4)8 list shouldNot haveSizeGreaterThan(5)9 }10 fun `should have size greater than or equal`() {11 val list = mutableListOf(1, 2, 3, 4, 5)12 list should haveSizeGreaterThanOrEqual(5)13 list shouldNot haveSizeGreaterThanOrEqual(6)14 }15 fun `should have size less than`() {16 val list = mutableListOf(1, 2, 3, 4, 5)17 list should haveSizeLessThan(6)18 list shouldNot haveSizeLessThan(5)19 }20 fun `should have size less than or equal`() {21 val list = mutableListOf(1, 2, 3, 4, 5)22 list should haveSizeLessThanOrEqual(5)23 list shouldNot haveSizeLessThanOrEqual(4)24 }25 fun `should be empty`() {26 val list = mutableListOf<Int>()27 list should beEmpty()28 list shouldNot beEmpty()29 }30 fun `should be in`() {31 val list = mutableListOf(1, 2, 3, 4, 5)32 list should beIn(1, 2, 3, 4, 5)33 list shouldNot beIn(6, 7, 8, 9, 10)34 }35 fun `should contain`() {36 val list = mutableListOf(1, 2, 3, 4, 5)37 list should contain(1)38 list shouldNot contain(6)39 }40 fun `should contain all`() {41 val list = mutableListOf(1, 2, 3, 4, 5)42 list should containAll(1, 2, 3, 4, 5)43 list shouldNot containAll(6, 7, 8,

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haveSizeMatcher

Using AI Code Generation

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1 list should haveSizeMatcher(3)2 list should haveSize(3)3 }4 fun `should have the size of the list as 2`() {5 val list = listOf("a", "b")6 list should haveSize(2)7 list should haveSizeMatcher(2)8 }9 fun `should have the size of the list as 1`() {10 val list = listOf("a")11 list should haveSize(1)12 list should haveSizeMatcher(1)13 }14 fun `should have the size of the list as 0`() {15 val list = emptyList<String>()16 list should haveSize(0)17 list should haveSizeMatcher(0)18 }19 fun `should have the size of the list as 4`() {20 val list = listOf("a", "b", "c", "d")21 list should haveSize(4)22 list should haveSizeMatcher(4)23 }24}25fun haveSizeMatcher(expected: Int) = object : Matcher<List<*>> {26 override fun test(value: List<*>): MatcherResult {27 return MatcherResult(28 {"List should have size $expected but has size ${value.size}"},29 {"List should not have size $expected"}30 }31}32fun haveSize(expected: Int) = object : Matcher<List<*>> {33 override fun test(value: List<*>): MatcherResult {34 return MatcherResult(35 {"List should have size $expected but has size ${value.size}"},36 {"List should not have size $expected"}37 }38}39@file:Suppress("unused")40import io.kotest.assertions.throwables.shouldThrow41import io.kotest.core.spec.style.FunSpec42import io.kotest.matchers.ints.shouldBeGreaterThan43import io.kotest.matchers.ints.shouldBeLessThan44import io.kotest.matchers.shouldBe45class ShouldThrowTest : FunSpec({46 test("should throw an exception") {47 shouldThrow<IllegalArgumentException> {

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