[Spec tests] Add tests for kotlin.Nothing and kotlin.Unit built-in types

compiler/tests-spec/testData/codegen/box/linked/expressions/built-in-types-and-their-semantics/kotlin.nothing-1/p-1/pos/1.1.kt

@@ -0,0 +1,23 @@
+// WITH_RUNTIME
+
+/*
+ * KOTLIN CODEGEN BOX SPEC TEST (POSITIVE)
+ *
+ * SPEC VERSION: 0.1-213
+ * PLACE: expressions, built-in-types-and-their-semantics, kotlin.nothing-1 -> paragraph 1 -> sentence 1
+ * NUMBER: 1
+ * DESCRIPTION: todo
+ */
+
+fun foo(): Nothing {
+    throw Exception()
+}
+
+fun box() {
+    try {
+        foo()
+    } catch (e: Exception) {
+        return "OK"
+    }
+    return "NOK"
+}

compiler/tests-spec/testData/codegen/box/linked/expressions/built-in-types-and-their-semantics/kotlin.nothing-1/testsMap.json

@@ -0,0 +1,14 @@
+{
+  "1": {
+    "pos": {
+      "1": [
+        {
+          "specVersion": "0.1-213",
+          "casesNumber": 0,
+          "description": "todo",
+          "unexpectedBehaviour": false
+        }
+      ]
+    }
+  }
+}

compiler/tests-spec/testData/codegen/box/linked/expressions/built-in-types-and-their-semantics/kotlin.unit/p-1/pos/1.1.kt

@@ -0,0 +1,31 @@
+// WITH_RUNTIME
+
+/*
+ * KOTLIN CODEGEN BOX SPEC TEST (POSITIVE)
+ *
+ * SPEC VERSION: 0.1-213
+ * PLACE: expressions, built-in-types-and-their-semantics, kotlin.unit -> paragraph 1 -> sentence 1
+ * NUMBER: 1
+ * DESCRIPTION: todo
+ */
+
+fun foo1() {
+    return Unit
+}
+
+fun foo2(): Unit {
+    return Unit
+}
+
+fun foo3(): Unit {
+}
+
+fun box(){
+    val u1 = foo1()
+    val u2 = foo2()
+    val u3 = foo3()
+    if (u1 === u2 && u1 === u3 && u2 === u3) {
+        return ( "OK")
+    }
+    return ( "NOK")
+}

compiler/tests-spec/testData/codegen/box/linked/expressions/built-in-types-and-their-semantics/kotlin.unit/testsMap.json

@@ -0,0 +1,14 @@
+{
+  "1": {
+    "pos": {
+      "1": [
+        {
+          "specVersion": "0.1-213",
+          "casesNumber": 0,
+          "description": "todo",
+          "unexpectedBehaviour": false
+        }
+      ]
+    }
+  }
+}