Prevent two warnings

```
/home/chkbuild/chkbuild/tmp/build/20240917T123003Z/ruby/test/ruby/test_case.rb:73: warning: 'when' clause on line 73 duplicates 'when' clause on line 73 and is ignored
/home/chkbuild/chkbuild/tmp/build/20240917T123003Z/ruby/test/ruby/test_syntax.rb:333: warning: key :k1 is duplicated and overwritten on line 333
```

2 files changed, 14 insertions, 4 deletions

diff --git a/test/ruby/test_case.rb b/test/ruby/test_case.rb
index 4a0f1bf78d..3725fb49bb 100644
--- a/test/ruby/test_case.rb
+++ b/test/ruby/test_case.rb
@@ -68,10 +68,15 @@ class TestCase < Test::Unit::TestCase
       assert(false)
     end
 
-    assert_raise(NameError) do
-      case
-      when false, *x, false
+    begin
+      verbose_bak, $VERBOSE = $VERBOSE, nil
+      assert_raise(NameError) do
+        case
+        when false, *x, false
+        end
       end
+    ensure
+      $VERBOSE = verbose_bak
     end
   end
 
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index fe6fa30e02..4ed28320b3 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -330,7 +330,12 @@ class TestSyntax < Test::Unit::TestCase
     bug10315 = '[ruby-core:65368] [Bug #10315]'
 
     o = KW2.new
-    assert_equal([23, 2], o.kw(**{k1: 22}, **{k1: 23}), bug10315)
+    begin
+      verbose_bak, $VERBOSE = $VERBOSE, nil
+      assert_equal([23, 2], eval("o.kw(**{k1: 22}, **{k1: 23}"), bug10315)
+    ensure
+      $VERBOSE = verbose_bak
+    end
 
     h = {k3: 31}
     assert_raise(ArgumentError) {o.kw(**h)}