[MPP] Add tests for const vs non-const expect and actual properties

KT-18856

compiler/testData/diagnostics/testsWithMultiplatformCompositeAnalysis/constVals/nonConstExpectConstActual.kt

@@ -0,0 +1,56 @@
+// MODULE: m1-common
+
+expect class NonConstNonConst {
+    companion object {
+        val prop: Int
+    }
+}
+
+expect class NonConstConst {
+    companion object {
+        val prop: Int
+    }
+}
+
+expect class ConstNonConst {
+    companion object {
+        <!CONST_VAL_WITHOUT_INITIALIZER!>const<!> val prop: Int
+    }
+}
+
+expect class ConstConst {
+    companion object {
+        <!CONST_VAL_WITHOUT_INITIALIZER!>const<!> val prop: Int
+    }
+}
+
+expect val NonConstNonConstTl: Int
+expect val NonConstConstTl: Int
+expect <!CONST_VAL_WITHOUT_INITIALIZER!>const<!> val ConstNonConstTl: Int
+expect <!CONST_VAL_WITHOUT_INITIALIZER!>const<!> val ConstConstTl: Int
+
+// MODULE: m2-jvm()()(m1-common)
+
+class NonConstImpl {
+    companion object {
+        val prop: Int get() = 42
+    }
+}
+
+class ConstImpl {
+    companion object {
+        const val prop: Int = 42
+    }
+}
+
+// actuals
+
+actual typealias NonConstNonConst = NonConstImpl
+actual typealias <!NO_ACTUAL_CLASS_MEMBER_FOR_EXPECTED_CLASS!>NonConstConst<!> = ConstImpl
+actual typealias <!NO_ACTUAL_CLASS_MEMBER_FOR_EXPECTED_CLASS!>ConstNonConst<!> = NonConstImpl
+actual typealias ConstConst = ConstImpl
+
+actual val NonConstNonConstTl: Int get() = 42
+<!ACTUAL_WITHOUT_EXPECT!>actual const<!> val NonConstConstTl: Int = 42
+<!ACTUAL_WITHOUT_EXPECT!>actual<!> val ConstNonConstTl: Int get() = 42
+actual const val ConstConstTl: Int = 42