add more test cases

Author: JLHwung

tests/fixtures/modifiers.js

@@ -61,7 +61,7 @@ const modifiersFixtures = [
 		'pattern': '(?i:[\\q{ab|cd|abc}--\\q{abc}--\\q{cd}])',
 		'flags': 'v',
 		'options':  { unicodeSetsFlag: 'transform', modifiers: false },
-		'expected': '(?i:(?:ab))',
+		'expected': '(?i:(?:[Aa][Bb]))',
 		'expectedFlags': 'u',
 	},	{
 		'pattern': '(?i:[\\q{ab|cd|abc}--\\q{abc}--\\q{cd}])',

tests/fixtures/unicode-set.js

@@ -421,11 +421,35 @@ const unicodeSetFixtures = [
 		expected: '[]',
 		expectedFlags: 'iu'
 	},
+	{
+		pattern: '[K--\\q{k}]',
+		flags: 'iv',
+		expected: '[]',
+		expectedFlags: 'iu'
+	},
 	{
 		pattern: '[\\u212A--k]',
 		flags: 'iv',
 		expected: '[]',
 		expectedFlags: 'iu'
+	},
+	{
+		pattern: '[\\q{\\u212A}--k]',
+		flags: 'iv',
+		expected: '[]',
+		expectedFlags: 'iu'
+	},
+	{
+		pattern: '[K--\\u212A]',
+		flags: 'iv',
+		expected: '[]',
+		expectedFlags: 'iu'
+	},
+	{
+		pattern: '[\\q{K}--\\q{\\u212A}]',
+		flags: 'iv',
+		expected: '[]',
+		expectedFlags: 'iu'
 	}
 ];