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

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

CollectionMatchers.kt

Source:CollectionMatchers.kt

`...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 {...`

singleElement

Using AI Code Generation

`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(NativeMethodAccessorImpl.java:62)20at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)21at java.base/java.lang.reflect.Method.invoke(Method.java:566)22at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)23at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)24at org.junit.jupiter.engine.execution.InvocationInterceptorChain\$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)25at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)26at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)27at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)28at org.junit.jupiter.engine.execution.ExecutableInvoker\$ReflectiveInterceptorCall.lambda\$ofVoidMethod\$0(ExecutableInvoker.java:115)29at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda\$invoke\$0(ExecutableInvoker.java:105)`

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