Add containsExactlyInAnyOrder(expected: Iterable<T>) support

assertk/src/commonMain/kotlin/assertk/assertions/iterable.kt

@@ -116,6 +116,27 @@ fun Assert<Iterable<*>>.containsExactlyInAnyOrder(vararg elements: Any?) = given
     }.toString())
 }
 
+inline fun <reified T> Assert<Iterable<T>>.containsExactlyInAnyOrder(expected: Iterable<T>) = given { actual ->
+    val actualMap = actual.groupingBy { it }.eachCount()
+    val expectedMap = expected.groupingBy { it }.eachCount()
+
+    if (actualMap == expectedMap) {
+        return
+    }
+
+    val notInActual = expectedMap.filter { (key, value) -> (actualMap[key] ?: 0) < value }.map { it.key }
+    val notInExpected = actualMap.filter { (key, value) -> (expectedMap[key] ?: 0) < value }.map { it.key }
+
+    expected(StringBuilder("to contain exactly in any order:${show(expected)} but was:${show(actual)}").apply {
+        if (notInActual.isNotEmpty()) {
+            append("\n elements not found:${show(notInActual)}")
+        }
+        if (notInExpected.isNotEmpty()) {
+            append("\n extra elements found:${show(notInExpected)}")
+        }
+    }.toString())
+}
+
 internal fun MutableList<*>.removeFirst(value: Any?) {
     val index = indexOf(value)
     if (index > -1) removeAt(index)

assertk/src/commonTest/kotlin/test/assertk/assertions/IterableTest.kt

@@ -206,6 +206,72 @@ class IterableTest {
             error.message
         )
     }
+
+    @Test fun containsExactlyInAnyOrder_only_elements_of_another_iterable_passes() {
+        assertThat(iterableOf(1, 2)).containsExactlyInAnyOrder(iterableOf(2, 1))
+    }
+
+    @Test fun containsExactlyInAnyOrder_only_elements_of_another_iterable_passes2() {
+        assertThat(iterableOf(1, 2, 1)).containsExactlyInAnyOrder(iterableOf(2, 1, 1))
+    }
+
+    @Test fun containsExactlyInAnyOrder_duplicate_elements_of_another_iterable_fails() {
+        val error = assertFailsWith<AssertionError> {
+            assertThat(iterableOf(1, 2, 2)).containsExactlyInAnyOrder(iterableOf(2, 1))
+        }
+        assertEquals(
+            """expected to contain exactly in any order:<[2, 1]> but was:<[1, 2, 2]>
+                | extra elements found:<[2]>
+            """.trimMargin(), error.message
+        )
+    }
+
+    @Test fun containsExactlyInAnyOrder_of_another_iterable_duplicate_elements_fails2() {
+        val error = assertFailsWith<AssertionError> {
+            assertThat(iterableOf(1, 2)).containsExactlyInAnyOrder(iterableOf(2, 2, 1))
+        }
+        assertEquals(
+            """expected to contain exactly in any order:<[2, 2, 1]> but was:<[1, 2]>
+                | elements not found:<[2]>
+            """.trimMargin(), error.message
+        )
+    }
+
+    @Test fun containsExactlyInAnyOrder__of_another_iterable_more_elements_fails() {
+        val error = assertFailsWith<AssertionError> {
+            assertThat(iterableOf(1, 2, 3)).containsExactlyInAnyOrder(iterableOf(2, 1))
+        }
+        assertEquals(
+            """expected to contain exactly in any order:<[2, 1]> but was:<[1, 2, 3]>
+                | extra elements found:<[3]>
+            """.trimMargin(), error.message
+        )
+    }
+
+    @Test fun containsExactlyInAnyOrder_of_another_iterable_less_elements_fails() {
+        val error = assertFailsWith<AssertionError> {
+            assertThat(iterableOf(1, 2, 3)).containsExactlyInAnyOrder(iterableOf(2, 1, 3, 4))
+        }
+        assertEquals(
+            """expected to contain exactly in any order:<[2, 1, 3, 4]> but was:<[1, 2, 3]>
+                | elements not found:<[4]>
+            """.trimMargin(),
+            error.message
+        )
+    }
+
+    @Test fun containsExactlyInAnyOrder_of_another_iterable_different_elements_fails() {
+        val error = assertFailsWith<AssertionError> {
+            assertThat(iterableOf(1)).containsExactlyInAnyOrder(iterableOf(2))
+        }
+        assertEquals(
+            """expected to contain exactly in any order:<[2]> but was:<[1]>
+                | elements not found:<[2]>
+                | extra elements found:<[1]>
+            """.trimMargin(),
+            error.message
+        )
+    }
     //endregion
 
     //region each