[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/incompleteCode/incompleteAssignment.fir.kt

@@ -0,0 +1,30 @@
+package sum
+
+import java.util.*
+fun sum(a : IntArray) : Int {
+    // Write your solution here
+    <!UNRESOLVED_REFERENCE!>res<!> = 0
+    for (e in a)
+        <!UNRESOLVED_REFERENCE, VARIABLE_EXPECTED!>res<!> +=<!SYNTAX!><!>
+}
+fun main() {
+    test(0)
+    test(1, 1)
+    test(-1, -1, 0)
+    test(6, 1, 2, 3)
+    test(6, 1, 1, 1, 1, 1, 1)
+}
+// HELPER FUNCTIONS
+fun test(expectedSum : Int, vararg data : Int) {
+    val actualSum = sum(data)
+    assertEquals(actualSum, expectedSum, "\ndata = ${Arrays.toString(data)}\n" +
+    "sum(data) = ${actualSum}, but must be $expectedSum ")
+}
+fun <T: Any> assertEquals(actual : T?, expected : T?, message : Any? = null) {
+    if (actual != expected) {
+        if (message == null)
+            throw AssertionError()
+        else
+            throw AssertionError(message)
+    }
+}