LL API: add kt -> fir mapping tests for types

idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/functionalType.kt

@@ -0,0 +1,2 @@
+
+fun x(): <expr>(Int) -> String</expr> = TODO()

idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/functionalType.txt

@@ -0,0 +1,5 @@
+KT element: KtTypeReference
+FIR element: FirResolvedTypeRefImpl
+
+FIR element rendered:
+R|(kotlin/Int) -> kotlin/String|

idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/functionalTypeArgument.kt

@@ -0,0 +1,2 @@
+
+fun x(): (<expr>Int</expr> ) -> String= TODO()

idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/functionalTypeArgument.txt

@@ -0,0 +1,5 @@
+KT element: KtParameter
+FIR element: FirValueParameterImpl
+
+FIR element rendered:
+R|kotlin/Int|

idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/nullableType.kt

@@ -0,0 +1,2 @@
+
+fun x(): <expr>Int?</expr> = TODO()

idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/nullableType.txt

@@ -0,0 +1,5 @@
+KT element: KtTypeReference
+FIR element: FirResolvedTypeRefImpl
+
+FIR element rendered:
+R|kotlin/Int?|

idea/idea-frontend-fir/idea-fir-low-level-api/tests/org/jetbrains/kotlin/idea/fir/low/level/api/GetOrBuildFirTestGenerated.java

@@ -445,6 +445,18 @@ public class GetOrBuildFirTestGenerated extends AbstractGetOrBuildFirTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types"), Pattern.compile("^(.+)\\.kt$"), null, true);
         }
 
+        @Test
+        @TestMetadata("functionalType.kt")
+        public void testFunctionalType() throws Exception {
+            runTest("idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/functionalType.kt");
+        }
+
+        @Test
+        @TestMetadata("functionalTypeArgument.kt")
+        public void testFunctionalTypeArgument() throws Exception {
+            runTest("idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/functionalTypeArgument.kt");
+        }
+
         @Test
         @TestMetadata("invalidTypeArgumentsCount.kt")
         public void testInvalidTypeArgumentsCount() throws Exception {
@@ -475,6 +487,12 @@ public class GetOrBuildFirTestGenerated extends AbstractGetOrBuildFirTest {
             runTest("idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/nestedTypeArgument.kt");
         }
 
+        @Test
+        @TestMetadata("nullableType.kt")
+        public void testNullableType() throws Exception {
+            runTest("idea/idea-frontend-fir/idea-fir-low-level-api/testdata/getOrBuildFir/types/nullableType.kt");
+        }
+
         @Test
         @TestMetadata("nullableTypeWithooutQuestionMark.kt")
         public void testNullableTypeWithooutQuestionMark() throws Exception {