Fix an error for Minitest/AssertEmptyLiteral when only passing an empty literal

changelog/fix_an_error_for_assert_empty_literal.md

@@ -0,0 +1 @@
+* [#300](https://github.com/rubocop/rubocop-minitest/pull/300): Fix an error for `Minitest/AssertEmptyLiteral` when only passing an empty literal. ([@earlopain][])

lib/rubocop/cop/minitest/assert_empty_literal.rb

@@ -22,7 +22,7 @@ class AssertEmptyLiteral < Base
         RESTRICT_ON_SEND = %i[assert_equal].freeze
 
         def_node_matcher :assert_equal_with_empty_literal, <<~PATTERN
-          (send nil? :assert_equal ${hash array} $...)
+          (send nil? :assert_equal ${hash array} $_+)
         PATTERN
 
         def on_send(node)

test/rubocop/cop/minitest/assert_empty_literal_test.rb

@@ -60,4 +60,14 @@ def test_do_something
       end
     RUBY
   end
+
+  def test_does_not_register_offense_when_only_passing_empty_hash_to_assert_equal
+    assert_no_offenses(<<~RUBY)
+      class FooTest < Minitest::Test
+        def test_do_something
+          assert_equal({})
+        end
+      end
+    RUBY
+  end
 end