diff --git a/test/lib/common.rb b/test/lib/common.rb
index d93c7685..0ddd3486 100644
--- a/test/lib/common.rb
+++ b/test/lib/common.rb
@@ -24,7 +24,7 @@ DEFAULT_TIMEOUT = 10
 FILE = File.expand_path(__FILE__)
 BASE = File.expand_path('../..', __dir__)
 Dir.chdir(BASE)
-FZF = %[FZF_DEFAULT_OPTS="--no-scrollbar --gutter ' ' --pointer '>' --marker '>'" FZF_DEFAULT_COMMAND= #{BASE}/bin/fzf].freeze
+FZF = %(FZF_DEFAULT_OPTS="--no-scrollbar --gutter ' ' --pointer '>' --marker '>'" FZF_DEFAULT_COMMAND= #{BASE}/bin/fzf).freeze
 
 def wait(timeout = DEFAULT_TIMEOUT)
   since = Time.now
diff --git a/test/test_core.rb b/test/test_core.rb
index c9f55803..1e1ff812 100644
--- a/test/test_core.rb
+++ b/test/test_core.rb
@@ -2004,7 +2004,7 @@ class TestCore < TestInteractive
       end
     end
     elapsed = Time.now - time
-    assert elapsed < 2
+    assert_operator elapsed, :<, 2
   end
 
   def test_bg_cancel
@@ -2017,7 +2017,7 @@ class TestCore < TestInteractive
     tmux.until { assert_equal 2, it.match_count }
     tmux.send_keys :Space
     tmux.until { |lines| assert lines.any_include?('[0]') }
-    sleep 2
+    sleep(2)
     tmux.until do |lines|
       assert lines.any_include?('[0]')
       refute lines.any_include?('[1]')