From e0a36e2d67ce231ba9244d0aa655f36b0fb610a6 Mon Sep 17 00:00:00 2001
From: Gareth Jones <jones258@gmail.com>
Date: Fri, 6 Mar 2020 13:34:18 +1300
Subject: [PATCH] fix(prefer-to-contain): check that expect argument is defined
 before use

---
 src/rules/__tests__/prefer-to-contain.test.ts | 1 +
 src/rules/prefer-to-contain.ts                | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/rules/__tests__/prefer-to-contain.test.ts b/src/rules/__tests__/prefer-to-contain.test.ts
index 8fa369bc8..2077d3710 100644
--- a/src/rules/__tests__/prefer-to-contain.test.ts
+++ b/src/rules/__tests__/prefer-to-contain.test.ts
@@ -5,6 +5,7 @@ const ruleTester = new TSESLint.RuleTester();
 
 ruleTester.run('prefer-to-contain', rule, {
   valid: [
+    'expect().toBe(false);',
     'expect(a).toContain(b);',
     "expect(a.name).toBe('b');",
     'expect(a).toBe(true);',
diff --git a/src/rules/prefer-to-contain.ts b/src/rules/prefer-to-contain.ts
index 4fd516e3a..11ad3435c 100644
--- a/src/rules/prefer-to-contain.ts
+++ b/src/rules/prefer-to-contain.ts
@@ -187,6 +187,7 @@ export default createRule({
 
         if (
           !matcher ||
+          !includesCall ||
           (modifier && modifier.name !== ModifierName.not) ||
           !isBooleanEqualityMatcher(matcher) ||
           !isFixableIncludesCallExpression(includesCall)