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AK+Tests: Fix StringUtils::contains() being confused by repeating text

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Previously, case-insensitively searching the haystack "Go Go Back" for
the needle "Go Back" would return false:

1. Match the first three characters. "Go ".
2. Notice that 'G' and 'B' don't match.
3. Skip ahead 3 characters, plus 1 for the outer for-loop.
4. Now, the haystack is effectively "o Back", so the match fails.

Reducing the skip by 1 fixes this issue. I'm not 100% convinced this
fixes all cases, but I haven't been able to find any cases where it
doesn't work now. :^)
This commit is contained in:
Sam Atkins 2022-03-18 18:02:07 +00:00 • committed by Linus Groh
parent 00eca26085
commit 7e98c8eaf6
2 changed files with 6 additions and 1 deletions
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4
Tests/AK/TestStringUtils.cpp
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@ -321,6 +321,10 @@ TEST_CASE(contains)
EXPECT(!AK::StringUtils::contains("", test_string, CaseSensitivity::CaseInsensitive));
EXPECT(!AK::StringUtils::contains(test_string, "L", CaseSensitivity::CaseSensitive));
EXPECT(!AK::StringUtils::contains(test_string, "L", CaseSensitivity::CaseInsensitive));
String command_palette_bug_string = "Go Go Back";
EXPECT(AK::StringUtils::contains(command_palette_bug_string, "Go Back", AK::CaseSensitivity::CaseSensitive));
EXPECT(AK::StringUtils::contains(command_palette_bug_string, "gO bAcK", AK::CaseSensitivity::CaseInsensitive));
}
TEST_CASE(is_whitespace)