Fix the unit tests in groovy and kotlin

Author: zsxwing

language-adaptors/rxjava-groovy/src/test/groovy/rx/lang/groovy/ObservableTests.groovy

@@ -278,7 +278,7 @@ def class ObservableTests {
         assertEquals("one", s)
     }
 
-    @Test(expected = IllegalStateException.class)
+    @Test(expected = IllegalArgumentException.class)
     public void testSingle2() {
         Observable.from("one", "two").toBlockingObservable().single({ x -> x.length() == 3})
     }

language-adaptors/rxjava-kotlin/src/test/kotlin/rx/lang/kotlin/BasicKotlinTests.kt

@@ -255,7 +255,7 @@ public class BasicKotlinTests {
         assertEquals("default", Observable.from("one", "two")!!.toBlockingObservable()!!.lastOrDefault("default") { x -> x!!.length > 3 })
     }
 
-    [Test(expected = javaClass<IllegalStateException>())]
+    [Test(expected = javaClass<IllegalArgumentException>())]
     public fun testSingle() {
         assertEquals("one", Observable.from("one")!!.toBlockingObservable()!!.single { x -> x!!.length == 3 })
         Observable.from("one", "two")!!.toBlockingObservable()!!.single { x -> x!!.length == 3 }