How to use singleElement method of io.kotest.matchers.collections.MatchInOrderSubsetProblem class

Best Kotest code snippet using io.kotest.matchers.collections.MatchInOrderSubsetProblem.singleElement


Source:CollectionMatchers.kt Github


Full Screen

...24      { "${actual.print().value} should not match the predicates ${predicates.print().value} in order" }25   )26}27fun <T> haveSize(size: Int): Matcher<Collection<T>> = haveSizeMatcher(size)28fun <T> singleElement(t: T): Matcher<Collection<T>> = object : Matcher<Collection<T>> {29   override fun test(value: Collection<T>) = MatcherResult(30      value.size == 1 && value.first() == t,31      { "Collection should be a single element of $t but has ${value.size} elements: ${value.print().value}" },32      { "Collection should not be a single element of $t" }33   )34}35fun <T> singleElement(p: (T) -> Boolean): Matcher<Collection<T>> = object : Matcher<Collection<T>> {36   override fun test(value: Collection<T>): MatcherResult {37      val filteredValue: List<T> = value.filter(p)38      return MatcherResult(39         filteredValue.size == 1,40         { "Collection should have a single element by a given predicate but has ${filteredValue.size} elements: ${value.print().value}" },41         { "Collection should not have a single element by a given predicate" }42      )43   }44}45fun <T : Comparable<T>> beSorted(): Matcher<List<T>> = sorted()46fun <T : Comparable<T>> sorted(): Matcher<List<T>> = sortedBy { it }47fun <T, E : Comparable<E>> beSortedBy(transform: (T) -> E): Matcher<List<T>> = sortedBy(transform)48fun <T, E : Comparable<E>> sortedBy(transform: (T) -> E): Matcher<List<T>> = object : Matcher<List<T>> {49   override fun test(value: List<T>): MatcherResult {...

Full Screen

Full Screen


Using AI Code Generation


Full Screen

1@Tag("matchers")2@DisplayName("Test matchers")3class MatchInOrderSubsetProblem {4@DisplayName("Test matchers")5fun test() {6val list = listOf(1, 2, 3, 4, 5)7val subset = listOf(1, 2, 3)8list should containAll(subset)9list should containAllInOrder(subset)10list should containAllInOrder(subset.singleElement())11}12}13at io.kotest.matchers.Matcher$Default.shouldThrow(Matcher.kt:61)14at io.kotest.matchers.Matcher$Default.shouldThrow(Matcher.kt:48)15at io.kotest.matchers.Matcher$Default.should(Matcher.kt:39)16at io.kotest.matchers.Matcher$Default.should$(Matcher.kt:36)17at io.kotest.matchers.collections.MatchInOrderSubsetProblem.test(MatchInOrderSubsetProblem.kt:15)18at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)19at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke( java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke( java.base/java.lang.reflect.Method.invoke( org.junit.platform.commons.util.ReflectionUtils.invokeMethod( org.junit.jupiter.engine.execution.MethodInvocation.proceed( org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed( org.junit.jupiter.engine.extension.TimeoutExtension.intercept( org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod( org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod( org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0( org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(

Full Screen

Full Screen

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.

LambdaTest Learning Hubs:


You could also refer to video tutorials over LambdaTest YouTube channel to get step by step demonstration from industry experts.

Run Kotest automation tests on LambdaTest cloud grid

Perform automation testing on 3000+ real desktop and mobile devices online.

Most used method in MatchInOrderSubsetProblem

Try LambdaTest Now !!

Get 100 minutes of automation test minutes FREE!!

Next-Gen App & Browser Testing Cloud

Was this article helpful?