[FIR] Add tests for top-level property initialization in scripts

- The test data is missing initialization checks and will be fixed with
  the subsequent commit.
- The test data is originally taken from
  `backingField/TopLevelPropertyInitialization` and has been simplified.
- I didn't add `const val` properties to the test data (compared to the
  original) due to KT-20110.

^KT-63286

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -30288,6 +30288,12 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 runTest("compiler/testData/diagnostics/tests/script/topLevelPropertiesWithGetSet.kts");
             }
 
+            @Test
+            @TestMetadata("topLevelPropertyInitialization.kts")
+            public void testTopLevelPropertyInitialization() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/script/topLevelPropertyInitialization.kts");
+            }
+
             @Test
             @TestMetadata("topLevelVariable.kts")
             public void testTopLevelVariable() throws Exception {

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -30288,6 +30288,12 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 runTest("compiler/testData/diagnostics/tests/script/topLevelPropertiesWithGetSet.kts");
             }
 
+            @Test
+            @TestMetadata("topLevelPropertyInitialization.kts")
+            public void testTopLevelPropertyInitialization() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/script/topLevelPropertyInitialization.kts");
+            }
+
             @Test
             @TestMetadata("topLevelVariable.kts")
             public void testTopLevelVariable() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java

@@ -30288,6 +30288,12 @@ public class FirPsiOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiDia
                 runTest("compiler/testData/diagnostics/tests/script/topLevelPropertiesWithGetSet.kts");
             }
 
+            @Test
+            @TestMetadata("topLevelPropertyInitialization.kts")
+            public void testTopLevelPropertyInitialization() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/script/topLevelPropertyInitialization.kts");
+            }
+
             @Test
             @TestMetadata("topLevelVariable.kts")
             public void testTopLevelVariable() throws Exception {

compiler/testData/diagnostics/tests/script/topLevelPropertyInitialization.fir.kts

@@ -0,0 +1,58 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -WRONG_INVOCATION_KIND
+// WITH_STDLIB
+
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
+import kotlin.properties.ReadOnlyProperty
+
+@OptIn(ExperimentalContracts::class)
+inline fun <T> inPlaceRun(block: () -> T): T {
+    contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
+    return block()
+}
+
+fun <T> notInPlaceRun(block: () -> T): T = null!!
+
+fun <T> simpleDelegate(value: T): ReadOnlyProperty<Any?, T> = null!!
+
+@OptIn(ExperimentalContracts::class)
+fun <T> inPlaceDelegate(block: () -> T): ReadOnlyProperty<Any?, T> {
+    contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
+    return null!!
+}
+
+fun <T> notInPlaceDelegate(block: () -> T): ReadOnlyProperty<Any?, T> = null!!
+
+val a: String = a
+val b: String = inPlaceRun { b }
+val c: String = notInPlaceRun { c }
+
+val d: String by simpleDelegate(d)
+val e: String by inPlaceDelegate { e }
+val f: String by notInPlaceDelegate { f }
+
+val g: Int
+val h = 1.also { <!VAL_REASSIGNMENT!>g<!> = 2 }
+val i: Int
+val j by lazy { <!VAL_REASSIGNMENT!>i<!> = 2; 1 }
+val k: Int
+    get() {
+        <!VAL_REASSIGNMENT!>i<!> = 3
+        return i
+    }
+
+val l: Comparator<String> = object : Comparator<String> {
+    val delegate: Comparator<String> get() = n
+    override fun compare(o1: String, o2: String): Int = delegate.compare(o1, o2)
+}
+val m: Comparator<String> = object : Comparator<String> by n {}
+val n: Comparator<String> = Comparator { _, _ -> 0 }
+
+val t: String = z
+val u: String = inPlaceRun { z }
+val v: String = notInPlaceRun { z }
+val w: String by simpleDelegate(z)
+val x: String by inPlaceDelegate { z }
+val y: String by notInPlaceDelegate { z }
+val z: String = "VALUE"

compiler/testData/diagnostics/tests/script/topLevelPropertyInitialization.kts

@@ -0,0 +1,58 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -WRONG_INVOCATION_KIND
+// WITH_STDLIB
+
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
+import kotlin.properties.ReadOnlyProperty
+
+@OptIn(ExperimentalContracts::class)
+inline fun <T> inPlaceRun(block: () -> T): T {
+    contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
+    return block()
+}
+
+fun <T> notInPlaceRun(block: () -> T): T = null!!
+
+fun <T> simpleDelegate(value: T): ReadOnlyProperty<Any?, T> = null!!
+
+@OptIn(ExperimentalContracts::class)
+fun <T> inPlaceDelegate(block: () -> T): ReadOnlyProperty<Any?, T> {
+    contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
+    return null!!
+}
+
+fun <T> notInPlaceDelegate(block: () -> T): ReadOnlyProperty<Any?, T> = null!!
+
+val a: String = <!UNINITIALIZED_VARIABLE!>a<!>
+val b: String = inPlaceRun { <!UNINITIALIZED_VARIABLE!>b<!> }
+val c: String = notInPlaceRun { <!UNINITIALIZED_VARIABLE!>c<!> }
+
+val d: String by simpleDelegate(d)
+val e: String by inPlaceDelegate { e }
+val f: String by notInPlaceDelegate { f }
+
+val g: Int
+val h = 1.also { <!CAPTURED_MEMBER_VAL_INITIALIZATION!>g<!> = 2 }
+<!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val i: Int<!>
+val j by lazy { <!CAPTURED_MEMBER_VAL_INITIALIZATION!>i<!> = 2; 1 }
+val k: Int
+    get() {
+        <!VAL_REASSIGNMENT!>i<!> = 3
+        return i
+    }
+
+val l: Comparator<String> = object : Comparator<String> {
+    val delegate: Comparator<String> get() = n
+    override fun compare(o1: String, o2: String): Int = delegate.compare(o1, o2)
+}
+val m: Comparator<String> = object : Comparator<String> by <!UNINITIALIZED_VARIABLE!>n<!> {}
+val n: Comparator<String> = Comparator { _, _ -> 0 }
+
+val t: String = <!UNINITIALIZED_VARIABLE!>z<!>
+val u: String = inPlaceRun { z }
+val v: String = notInPlaceRun { z }
+val w: String by simpleDelegate(<!UNINITIALIZED_VARIABLE!>z<!>)
+val x: String by inPlaceDelegate { z }
+val y: String by notInPlaceDelegate { z }
+val z: String = "VALUE"

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java

@@ -32276,6 +32276,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/script/topLevelPropertiesWithGetSet.kts");
             }
 
+            @Test
+            @TestMetadata("topLevelPropertyInitialization.kts")
+            public void testTopLevelPropertyInitialization() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/script/topLevelPropertyInitialization.kts");
+            }
+
             @Test
             @TestMetadata("topLevelVariable.kts")
             public void testTopLevelVariable() throws Exception {