add tests for smartrwlocker

coroutines/src/commonTest/kotlin/SmartRWLockerTests.kt

@@ -0,0 +1,60 @@
+import dev.inmo.micro_utils.coroutines.SmartRWLocker
+import dev.inmo.micro_utils.coroutines.withReadAcquire
+import dev.inmo.micro_utils.coroutines.withWriteLock
+import kotlinx.coroutines.CoroutineStart
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.joinAll
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class SmartRWLockerTests {
+    @Test
+    fun compositeTest() {
+        val locker = SmartRWLocker()
+
+        val readAndWriteWorkers = 10
+        runTest {
+            var started = 0
+            var done = 0
+            val doneMutex = Mutex()
+            val readWorkers = (0 until readAndWriteWorkers).map {
+                launch(start = CoroutineStart.LAZY) {
+                    locker.withReadAcquire {
+                        doneMutex.withLock {
+                            started++
+                        }
+                        delay(100L)
+                        doneMutex.withLock {
+                            done++
+                        }
+                    }
+                }
+            }
+
+            var doneWrites = 0
+
+            val writeWorkers = (0 until readAndWriteWorkers).map {
+                launch(start = CoroutineStart.LAZY) {
+                    locker.withWriteLock {
+                        assertTrue(done == readAndWriteWorkers || started == 0)
+                        delay(10L)
+                        doneWrites++
+                    }
+                }
+            }
+            readWorkers.forEach { it.start() }
+            writeWorkers.forEach { it.start() }
+
+            readWorkers.joinAll()
+            writeWorkers.joinAll()
+
+            assertEquals(expected = readAndWriteWorkers, actual = done)
+            assertEquals(expected = readAndWriteWorkers, actual = doneWrites)
+        }
+    }
+}