Adjust test to set+get big values on all platforms and add MINGW-UCRT

Previously the test verified on MSWIN that huge values can not be stored in environment variables but that they can on others.
IMHO the intention of the test should not change between platforms.
Therefore this adjusts the test to have the same intention - that is to store a big value.

This also fixes compatibility with MINGW-UCRT, which previously failed with:
  <Errno::EINVAL: Invalid argument - ruby_setenv(foo)>
    test/ruby/test_env.rb:512:in `[]='
    test/ruby/test_env.rb:512:in `block in test_huge_value'

1 files changed, 7 insertions, 7 deletions

diff --git a/test/ruby/test_env.rb b/test/ruby/test_env.rb
index 583b432e3d..ea0f367334 100644
--- a/test/ruby/test_env.rb
+++ b/test/ruby/test_env.rb
@@ -503,15 +503,15 @@ class TestEnv < Test::Unit::TestCase
   end
 
   def test_huge_value
-    huge_value = "bar" * 40960
-    ENV["foo"] = "bar"
-    if /mswin/ =~ RUBY_PLATFORM
-      assert_raise(Errno::EINVAL) { ENV["foo"] = huge_value }
-      assert_equal("bar", ENV["foo"])
+    if /mswin/ =~ RUBY_PLATFORM || /ucrt/ =~ RbConfig::CONFIG['sitearch']
+      # On Windows >= Vista each environment variable can be max 32768 characters
+      huge_value = "bar" * 10900
     else
-      assert_nothing_raised { ENV["foo"] = huge_value }
-      assert_equal(huge_value, ENV["foo"])
+      huge_value = "bar" * 40960
     end
+    ENV["foo"] = "overwritten"
+    assert_nothing_raised { ENV["foo"] = huge_value }
+    assert_equal(huge_value, ENV["foo"])
   end
 
   if /mswin|mingw/ =~ RUBY_PLATFORM