Account for fuzzy completions.

Introduced in Fish 3.1
cf. https://github.com/fish-shell/fish-shell/issues/5467

Needed to make tests less strict.
Instead of checking the exact list of matches,
we require the expected ones and exclude some others.

test/features/support/parameter_types.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+ParameterType(
+  name: 'patterns',
+  regexp: %r{([^\s]*|'[^']*'|/[^/]*/)(,\s*([^\s]*|'[^']*'|/[^/]*/))*},
+  type: Array,
+  transformer: lambda do |*patterns|
+                 patterns \
+                   .map(&:strip) \
+                   .map do |s|
+                     s = if %r{^/(.*)/$} =~ s
+                           Regexp.last_match(1)
+                         elsif %r{^'(.*)'$} =~ s
+                           "^#{Regexp.escape(Regexp.last_match(1))}$"
+                         else
+                           "^#{Regexp.escape(s)}$"
+                         end
+                     Regexp.compile(s)
+                   end
+               end
+)