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

compiler/testData/diagnostics/tests/when/RedundantElse.fir.kt

@@ -0,0 +1,68 @@
+// FILE: MyEnum.java
+public enum MyEnum {
+    SINGLE;
+
+    public static MyEnum getInstance() {
+        return SINGLE;
+    }
+}
+
+
+// FILE: test.kt
+
+sealed class X {
+    class A : X()
+    class B : X()
+}
+
+fun foo(x: X) = when (x) {
+    is X.A -> {}
+    is X.B -> {}
+    else -> {}
+}
+
+fun bar(x: X?): String = when (x) {
+    is X.A -> "A"
+    is X.B -> "B"
+    null -> "null"
+    else -> "Unreachable"
+}
+
+fun justUse(x: X) {
+    when (x) {
+        is X.A -> {}
+        is X.B -> {}
+        // Redundant even in statement position
+        else -> {}
+    }
+}
+
+enum class E {
+    A, B
+}
+
+fun foo(e: E): String = when (e) {
+    E.A -> "A"
+    E.B -> "B"
+    else -> ""
+}
+
+fun bar(e: E?): String = when (e) {
+    E.A -> "A"
+    E.B -> "B"
+    else -> "" // no warning
+}
+
+fun foo(b: Boolean) = when (b) {
+    true -> 1
+    false -> 0
+    else -> -1
+}
+
+fun useJava(): String {
+    val me = MyEnum.getInstance()
+    return when (me) {
+        MyEnum.SINGLE -> "OK"
+        else -> "FAIL" // no warning
+    }
+}