From a227ed534e93abf920cf08b46705f3e19905b9d3 Mon Sep 17 00:00:00 2001
From: Nicholas Jamieson <nicholas@cartant.com>
Date: Sun, 29 Jul 2018 08:44:34 +1000
Subject: [PATCH] chore(dtslint): add find tests

Closes #3969.
---
 spec-dtslint/operators/find-spec.ts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 spec-dtslint/operators/find-spec.ts

diff --git a/spec-dtslint/operators/find-spec.ts b/spec-dtslint/operators/find-spec.ts
new file mode 100644
index 0000000000..ee8aa56d3a
--- /dev/null
+++ b/spec-dtslint/operators/find-spec.ts
@@ -0,0 +1,26 @@
+import { of } from 'rxjs';
+import { find } from 'rxjs/operators';
+
+it('should support a user-defined type guard', () => {
+  const o = of('foo').pipe(find((s): s is 'foo' => true)); // $ExpectType Observable<"foo" | undefined>
+});
+
+it('should support a user-defined type guard that takes an index', () => {
+  const o = of('foo').pipe(find((s, index): s is 'foo' => true)); // $ExpectType Observable<"foo" | undefined>
+});
+
+it('should support a user-defined type guard that takes an index and the source', () => {
+  const o = of('foo').pipe(find((s, index, source): s is 'foo' => true)); // $ExpectType Observable<"foo" | undefined>
+});
+
+it('should support a predicate', () => {
+  const o = of('foo').pipe(find(s => true)); // $ExpectType Observable<string | undefined>
+});
+
+it('should support a predicate that takes an index', () => {
+  const o = of('foo').pipe(find((s, index) => true)); // $ExpectType Observable<string | undefined>
+});
+
+it('should support a predicate that takes an index and the source', () => {
+  const o = of('foo').pipe(find((s, index, source) => true)); // $ExpectType Observable<string | undefined>
+});