diff --git a/kotlinx-coroutines-core/common/test/channels/BasicOperationsTest.kt b/kotlinx-coroutines-core/common/test/channels/BasicOperationsTest.kt
index fb9e0d9cf1..03c5f7457f 100644
--- a/kotlinx-coroutines-core/common/test/channels/BasicOperationsTest.kt
+++ b/kotlinx-coroutines-core/common/test/channels/BasicOperationsTest.kt
@@ -8,31 +8,31 @@ class BasicOperationsTest : TestBase() {
     @Test
     fun testSimpleSendReceive() = runTest {
         // Parametrized common test :(
-        TestChannelKind.values().forEach { kind -> testSendReceive(kind, 20) }
+        TestChannelKind.entries.forEach { kind -> testSendReceive(kind, 20) }
     }
 
     @Test
     fun testTrySendToFullChannel() = runTest {
-        TestChannelKind.values().forEach { kind -> testTrySendToFullChannel(kind) }
+        TestChannelKind.entries.forEach { kind -> testTrySendToFullChannel(kind) }
     }
 
     @Test
     fun testTrySendAfterClose() = runTest {
-        TestChannelKind.values().forEach { kind -> testTrySendAfterClose(kind) }
+        TestChannelKind.entries.forEach { kind -> testTrySendAfterClose(kind) }
     }
 
     @Test
     fun testSendAfterClose() = runTest {
-        TestChannelKind.values().forEach { kind -> testSendAfterClose(kind) }
+        TestChannelKind.entries.forEach { kind -> testSendAfterClose(kind) }
     }
 
     @Test
     fun testReceiveCatching() = runTest {
-        TestChannelKind.values().forEach { kind -> testReceiveCatching(kind) }
+        TestChannelKind.entries.forEach { kind -> testReceiveCatching(kind) }
     }
 
     @Test
-    fun testInvokeOnClose() = TestChannelKind.values().forEach { kind ->
+    fun testInvokeOnClose() = TestChannelKind.entries.forEach { kind ->
         reset()
         val channel = kind.create<Int>()
         channel.invokeOnClose {
@@ -48,7 +48,7 @@ class BasicOperationsTest : TestBase() {
     }
 
     @Test
-    fun testInvokeOnClosed() = TestChannelKind.values().forEach { kind ->
+    fun testInvokeOnClosed() = TestChannelKind.entries.forEach { kind ->
         reset()
         expect(1)
         val channel = kind.create<Int>()
@@ -59,7 +59,7 @@ class BasicOperationsTest : TestBase() {
     }
 
     @Test
-    fun testMultipleInvokeOnClose() = TestChannelKind.values().forEach { kind ->
+    fun testMultipleInvokeOnClose() = TestChannelKind.entries.forEach { kind ->
         reset()
         val channel = kind.create<Int>()
         channel.invokeOnClose { expect(3) }
@@ -71,14 +71,16 @@ class BasicOperationsTest : TestBase() {
     }
 
     @Test
-    fun testIterator() = runTest {
-        TestChannelKind.values().forEach { kind ->
+    fun testIteratorHasNextMustPrecedeNext() = runTest {
+        TestChannelKind.entries.forEach { kind ->
             val channel = kind.create<Int>()
             val iterator = channel.iterator()
             assertFailsWith<IllegalStateException> { iterator.next() }
             channel.close()
             assertFailsWith<IllegalStateException> { iterator.next() }
             assertFalse(iterator.hasNext())
+            assertFailsWith<NoSuchElementException> { iterator.next() }
+            assertFailsWith<IllegalStateException> { iterator.next() }
         }
     }
 
@@ -109,7 +111,7 @@ class BasicOperationsTest : TestBase() {
             try {
                 expect(2)
                 channel.close()
-            } catch (e: TestException) {
+            } catch (_: TestException) {
                 expect(4)
             }
         }
diff --git a/kotlinx-coroutines-core/common/test/channels/ClosedChannelTest.kt b/kotlinx-coroutines-core/common/test/channels/ClosedChannelTest.kt
new file mode 100644
index 0000000000..3731d11575
--- /dev/null
+++ b/kotlinx-coroutines-core/common/test/channels/ClosedChannelTest.kt
@@ -0,0 +1,123 @@
+package kotlinx.coroutines.channels
+
+import kotlinx.coroutines.testing.*
+import kotlin.test.*
+
+class ClosedChannelTest : TestBase() {
+    /**
+     * Iterator.
+     */
+
+    @Test
+    fun testIteratorClosedHasNextFalse() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            val iterator = channel.iterator()
+            channel.close()
+            assertFalse(iterator.hasNext())
+        }
+    }
+
+    @Test
+    fun testIteratorClosedWithExceptionHasNextThrows() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            val iterator = channel.iterator()
+            channel.close(TestException())
+            assertFailsWith<TestException> { (iterator.hasNext()) }
+        }
+    }
+
+    @Test
+    fun testClosedToListOk() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            channel.close()
+            channel.toList()
+        }
+    }
+
+    /**
+     * Properties.
+     *
+     * Properties stay the same regardless of whether the channel was closed with or without exception.
+     */
+
+    @Test
+    fun testClosedIsClosedForReceive() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            assertFalse(channel.isClosedForReceive)
+            channel.close()
+            assertTrue(channel.isClosedForReceive)
+        }
+    }
+
+    @Test
+    fun testClosedWithExceptionIsClosedForReceive() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            assertFalse(channel.isClosedForReceive)
+            channel.close(TestException())
+            assertTrue(channel.isClosedForReceive)
+        }
+    }
+
+    @Test
+    fun testClosedIsEmptyFalse() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            assertTrue(channel.isEmpty)
+            assertFalse(channel.isClosedForReceive)
+            channel.close()
+            // NB! Not obvious.
+            assertFalse(channel.isEmpty)
+            assertTrue(channel.isClosedForReceive)
+        }
+    }
+
+    @Test
+    fun testClosedWithExceptionIsEmptyFalse() = runTest {
+        TestChannelKind.entries.forEach { kind ->
+            val channel = kind.create<Int>()
+            assertTrue(channel.isEmpty)
+            assertFalse(channel.isClosedForReceive)
+            channel.close(TestException())
+            assertFalse(channel.isEmpty)
+            assertTrue(channel.isClosedForReceive)
+        }
+    }
+
+    @Test
+    fun testSendClosedReceiveIsEmptyFalse() = runTest {
+        val channel = Channel<Int>(1)
+        assertTrue(channel.isEmpty)
+        assertFalse(channel.isClosedForReceive)
+        channel.send(1)
+        assertFalse(channel.isEmpty)
+        assertFalse(channel.isClosedForReceive)
+        channel.close()
+        assertFalse(channel.isEmpty)
+        assertFalse(channel.isClosedForReceive)
+        channel.receive()
+        assertFalse(channel.isEmpty)
+        assertTrue(channel.isClosedForReceive)
+    }
+
+    @Test
+    fun testSendClosedWithExceptionReceiveIsEmptyFalse() = runTest {
+        val channel = Channel<Int>(1)
+        assertTrue(channel.isEmpty)
+        assertFalse(channel.isClosedForReceive)
+        channel.send(1)
+        assertFalse(channel.isEmpty)
+        assertFalse(channel.isClosedForReceive)
+        channel.close(TestException())
+        assertFalse(channel.isEmpty)
+        assertFalse(channel.isClosedForReceive)
+        channel.receive()
+        assertFalse(channel.isEmpty)
+        assertTrue(channel.isClosedForReceive)
+    }
+
+}