fix(prefer-in-document): handle toHaveLength without any arguments and with trailing commas (#276)

* fix(prefer-in-document): crash when on matcher args in toHaveLength

* fix(prefer-in-document): properly remove all matcher args and commas

* fix(prefer-in-document): update comment on comma removal logic

Author: berkinanik

src/__tests__/lib/rules/prefer-in-document.js

@@ -51,6 +51,10 @@ const valid = [
   expect(foo).not.toHaveLength(0)`,
   `let foo;
   expect(foo).toHaveLength(1);`,
+  `let foo;
+  expect(foo).toHaveLength()`,
+  `let foo;
+  expect(foo).toHaveLength(1, 2, 3)`,
   `expect(screen.notAQuery('foo-bar')).toHaveLength(1)`,
   `expect(screen.getAllByText('foo-bar')).toHaveLength(2)`,
   `import foo from "./foo";
@@ -99,6 +103,82 @@ const valid = [
   expect(element).toBeInTheDocument`,
 ];
 const invalid = [
+  invalidCase(
+    `expect(screen.getByText('foo')).toHaveLength()`,
+    `expect(screen.getByText('foo')).not.toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getAllByText('foo')).toHaveLength()`,
+    `expect(screen.getByText('foo')).not.toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getByRole('foo')).toHaveLength()`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength()`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getByRole('foo')).toHaveLength(0,2,3)`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(0,2,3,)`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getByRole('foo')).toHaveLength(1,2,3)`,
+    `expect(screen.getByRole('foo')).toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(1,2,3,)`,
+    `expect(screen.getByRole('foo')).toBeInTheDocument()`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(0//comment
+)`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument(//comment
+)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(1,//comment
+)`,
+    `expect(screen.getByRole('foo')).toBeInTheDocument(//comment
+)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(0,2,3//comment
+)`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument(//comment
+)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(1,2,3,//comment
+)`,
+    `expect(screen.getByRole('foo')).toBeInTheDocument(//comment
+)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(0,2,//comment
+3,4)`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument(//comment
+)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(1,2,//comment
+3,4,)`,
+    `expect(screen.getByRole('foo')).toBeInTheDocument(//comment
+)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(0,2/*comment*/,3)`,
+    `expect(screen.getByRole('foo')).not.toBeInTheDocument(/*comment*/)`
+  ),
+  invalidCase(
+    `expect(screen.getAllByRole('foo')).toHaveLength(1,2,/*comment*/3,)`,
+    `expect(screen.getByRole('foo')).toBeInTheDocument(/*comment*/)`
+  ),
   invalidCase(
     `expect(screen.getByText('foo')).toHaveLength(1)`,
     `expect(screen.getByText('foo')).toBeInTheDocument()`

src/rules/prefer-in-document.js

@@ -40,7 +40,12 @@ function usesToBeOrToEqualWithNull(matcherNode, matcherArguments) {
 }
 
 function usesToHaveLengthZero(matcherNode, matcherArguments) {
-  return matcherNode.name === "toHaveLength" && matcherArguments[0].value === 0;
+  // matcherArguments.length === 0: toHaveLength() will cause jest matcher error
+  // matcherArguments[0].value:     toHaveLength(0, ...) means zero length
+  return (
+    matcherNode.name === "toHaveLength" &&
+    (matcherArguments.length === 0 || matcherArguments[0].value === 0)
+  );
 }
 
 export const create = (context) => {
@@ -117,6 +122,12 @@ export const create = (context) => {
 
           // Remove any arguments in the matcher
           for (const argument of Array.from(matcherArguments)) {
+            const sourceCode = context.getSourceCode();
+            const token = sourceCode.getTokenAfter(argument);
+            if (token.value === "," && token.type === "Punctuator") {
+              // Remove commas if toHaveLength had more than one argument or a trailing comma
+              operations.push(fixer.replaceText(token, ""));
+            }
             operations.push(fixer.remove(argument));
           }