fix #31 type records for simple types and extern keyword for methods/functions

lynglib/src/commonTest/kotlin/TypesTest.kt

@@ -1,10 +1,53 @@
 import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.eval
 import kotlin.test.Test
 
 class TypesTest {
 
     @Test
     fun testTypeCollection1() = runTest {
+        eval("""
+           class Point(x: Real, y: Real)
+           assert(Point(1,2).x == 1)
+           assert(Point(1,2).y == 2)
+           assert(Point(1,2) is Point)
+        """.trimIndent())
 
     }
+    @Test
+    fun testTypeCollection2() = runTest {
+        eval("""
+           fun fn1(x: Real, y: Real): Real { x + y }
+        """.trimIndent())
+
+    }
+    @Test
+    fun testTypeCollection3() = runTest {
+        eval("""
+           class Test(a: Int) {
+              fun fn1(x: Real, y: Real): Real { x + y }
+           }
+        """.trimIndent())
+    }
+
+    @Test
+    fun testExternDeclarations() = runTest {
+        eval("""
+            extern fun foo1(a: String): Void
+            assertThrows { foo1("1") }
+           class Test(a: Int) {
+              extern fun fn1(x: Real, y: Real): Real
+//              extern val b: Int
+           }
+//           println("1")
+           val t = Test(0)
+//           println(t.b)
+//           println("2")
+           assertThrows {
+            t.fn1(1,2)
+           }
+//           println("4")
+           
+        """.trimIndent())
+    }
 }