Add tests

ahejlsberg · ahejlsberg · commit 3d4c14c5f899 · 2019-10-24T10:14:09.000-04:00
diff --git a/tests/cases/conformance/expressions/nullishCoalescingOperator/nullishCoalescingOperator1.ts b/tests/cases/conformance/expressions/nullishCoalescingOperator/nullishCoalescingOperator1.ts
@@ -1,4 +1,5 @@
 // @strict: true
+// @allowUnreachableCode: false
 
 declare const a1: string | undefined | null
 declare const a2: string | undefined | null
@@ -39,4 +40,28 @@ const cc4 = c4 ?? true;
 const dd1 = d1 ?? {b: 1};
 const dd2 = d2 ?? {b: 1};
 const dd3 = d3 ?? {b: 1};
-const dd4 = d4 ?? {b: 1};
+const dd4 = d4 ?? {b: 1};
+
+// Repro from #34635
+
+declare function foo(): void;
+
+const maybeBool = false;
+
+if (!(maybeBool ?? true)) {
+    foo();
+}
+
+if (maybeBool ?? true) {
+    foo();
+}
+else {
+    foo();
+}
+
+if (false ?? true) {
+    foo();
+}
+else {
+    foo();
+}
