✨ Pass interface is test

src/test/resources/advanced/instanceoftest.kt

@@ -8,6 +8,24 @@ open class D: C()
 
 open class E: D()
 
+interface I1
+
+interface I2
+
+interface I3: I1
+
+open class F1: I1
+
+open class F2: I2
+
+open class F3: I3
+
+class F4: F1()
+
+class F5: F2()
+
+class F6: F3(), I2
+
 fun testInstanceOf() {
     val b = B()
     val c = C()
@@ -37,4 +55,28 @@ fun testInstanceOf() {
     assert(c is B)
 
     println("All tests passed!")
+
+    val f1 = F1()
+    val f2 = F2()
+    val f3 = F3()
+    val f4 = F4()
+    val f5 = F5()
+    val f6 = F6()
+
+    assert(f1 is I1)
+    assert(f2 is I2)
+    assert(f3 is I3)
+    assert(f3 is I1)
+    assert(f4 is I1)
+    assert(f5 is I2)
+    assert(f6 is I2)
+
+    assert(f1 !is I2)
+    assert(f2 !is I1)
+    assert(f3 is I1)
+    assert((f4 as Any) !is I2)
+    assert((f5 as Any) !is I1)
+    assert(f6 is I1)
+
+    println("All tests passed!")
 }