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Tests for 5. Longest Palindromic Substring

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`@@ -28,6 +28,7 @@ import 'medium/3.longest_substring_without_repeating_characters.test.dart'`
`28`	`28`	`as longest_substring_without_repeating_characters;`
`29`	`29`	`import 'medium/424.longest_repeating_character_replacement.test.dart' as longest_repeating_character_replacement;`
`30`	`30`	`import 'medium/49.group_anagrams.test.dart' as group_anagrams;`
	`31`	`+import 'medium/5.longest_palindromic_substring.test.dart' as longest_palindromic_substring;`
`31`	`32`	`import 'medium/912.sort_an_array.test.dart' as sort_an_array;`
`32`	`33`
`33`	`34`	`void main() {`
`@@ -58,5 +59,6 @@ void main() {`
`58`	`59`	`element_appearing_more_than_25_percent_in_sorted_array.main();`
`59`	`60`	`valid_anagram.main();`
`60`	`61`	`group_anagrams.main();`
	`62`	`+ longest_palindromic_substring.main();`
`61`	`63`	`});`
`62`	`64`	`}`

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`@@ -0,0 +1,25 @@`
	`1`	`+import 'package:leetcode/src/medium/5.longest_palindromic_substring/main.dart';`
	`2`	`+import 'package:test/test.dart';`
	`3`	`+`
	`4`	`+void main() {`
	`5`	`+ group('longest_palindromic_substring', () {`
	`6`	`+ final f = Solution().longestPalindrome;`
	`7`	`+`
	`8`	`+ test('returns empty string for empty input', () {`
	`9`	`+ expect(f(''), equals(''));`
	`10`	`+ });`
	`11`	`+`
	`12`	`+ test('returns single-character string for input with one character', () {`
	`13`	`+ expect(f('a'), equals('a'));`
	`14`	`+ });`
	`15`	`+`
	`16`	`+ test('returns longest palindromic substring for input with multiple palindromes', () {`
	`17`	`+ expect(f('babad'), anyOf(equals('bab'), equals('aba')));`
	`18`	`+ expect(f('cbbd'), equals('bb'));`
	`19`	`+ });`
	`20`	`+`
	`21`	`+ test('returns input string for input with no palindromes', () {`
	`22`	`+ expect(f('abc'), anyOf(equals('a'), equals('b'), equals('c')));`
	`23`	`+ });`
	`24`	`+ }); // group 'longest_palindromic_substring'`
	`25`	`+}`

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