More simple bootstrap tests for kwargs

bootstraptest/test_yjit.rb

@@ -2074,6 +2074,35 @@ assert_equal '["sub", "sub"]', %q{
   [foo(sub), foo(sub)]
 }
 
+assert_equal '[1]', %q{
+  def kwargs(value:)
+    value
+  end
+
+  5.times.map { kwargs(value: 1) }.uniq
+}
+
+assert_equal '[[1, 2]]', %q{
+  def kwargs(left:, right:)
+    [left, right]
+  end
+
+  5.times.flat_map do
+    [
+      kwargs(left: 1, right: 2),
+      kwargs(right: 2, left: 1)
+    ]
+  end.uniq
+}
+
+assert_equal '[[1, 2]]', %q{
+  def kwargs(lead, kwarg:)
+    [lead, kwarg]
+  end
+
+  5.times.map { kwargs(1, kwarg: 2) }.uniq
+}
+
 # leading and keyword arguments are swapped into the right order
 assert_equal '[[1, 2, 3, 4, 5, 6]]', %q{
   def kwargs(five, six, a:, b:, c:, d:)