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Tests for 22. Generate Parentheses

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`@@ -24,6 +24,7 @@ import 'easy/83.remove_duplicates_from_sorted_list.test.dart' as remove_duplicat`
`24`	`24`	`import 'easy/88.merge_sorted_array.test.dart' as merge_sorted_array;`
`25`	`25`	`import 'easy/9.palindrome_number.test.dart' as palindrome_number;`
`26`	`26`	`import 'easy/94.binary_tree_inorder_traversal.test.dart' as binary_tree_inorder_traversal;`
	`27`	`+import 'medium/22.generate_parentheses.test.dart' as generate_parentheses;`
`27`	`28`	`import 'medium/3.longest_substring_without_repeating_characters.test.dart'`
`28`	`29`	`as longest_substring_without_repeating_characters;`
`29`	`30`	`import 'medium/424.longest_repeating_character_replacement.test.dart' as longest_repeating_character_replacement;`
`@@ -68,5 +69,6 @@ void main() {`
`68`	`69`	`longest_palindromic_subsequence.main();`
`69`	`70`	`string_to_integer_atoi.main();`
`70`	`71`	`subarray_sum_equals_k.main();`
	`72`	`+ generate_parentheses.main();`
`71`	`73`	`});`
`72`	`74`	`}`

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`@@ -0,0 +1,20 @@`
	`1`	`+import 'package:leetcode/src/medium/22.generate_parentheses/main.dart';`
	`2`	`+import 'package:test/test.dart';`
	`3`	`+`
	`4`	`+void main() {`
	`5`	`+ group('generate_parentheses', () {`
	`6`	`+ final f = Solution().generateParenthesis;`
	`7`	`+`
	`8`	`+ test('returns correct combinations for n = 1', () {`
	`9`	`+ expect(f(1), equals(['()']));`
	`10`	`+ });`
	`11`	`+`
	`12`	`+ test('returns correct combinations for n = 2', () {`
	`13`	`+ expect(f(2), equals(['(())', '()()']));`
	`14`	`+ });`
	`15`	`+`
	`16`	`+ test('returns correct combinations for n = 3', () {`
	`17`	`+ expect(f(3), equals(['((()))', '(()())', '(())()', '()(())', '()()()']));`
	`18`	`+ });`
	`19`	`+ }); // group 'generate_parentheses'`
	`20`	`+}`

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