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Harden TestObjSpace#test_memsize_of_root_shared_string

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This test occasionally fail because it runs into a String instance
that had its `==` method removed.

I couldn't identify where this String comes from, but in general
when using `each_object` it's best to not assume returned objectd
are functional.

By just inverting the operands of `==` we ensure it's always
`String#==` that is called.

```
  1) Error:
TestObjSpace#test_memsize_of_root_shared_string:
NoMethodError: undefined method '==' for #<String:0x00007f9b50e8c978>
    /tmp/ruby/src/trunk-random1/test/objspace/test_objspace.rb:35:in 'block in TestObjSpace#test_memsize_of_root_shared_string'
    /tmp/ruby/src/trunk-random1/test/objspace/test_objspace.rb:35:in 'ObjectSpace.each_object'
    /tmp/ruby/src/trunk-random1/test/objspace/test_objspace.rb:35:in 'TestObjSpace#test_memsize_of_root_shared_string'
```
This commit is contained in:
Jean Boussier 2025-03-06 08:09:57 +01:00
parent c939d0c85d
commit ca4325f6c9
Notes: git 2026-01-15 08:21:04 +00:00 
Merged: https://github.com/ruby/ruby/pull/12870
1 changed files with 1 additions and 1 deletions
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test/objspace/test_objspace.rb
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@ -32,7 +32,7 @@ class TestObjSpace < Test::Unit::TestCase
a = "a" * GC::INTERNAL_CONSTANTS[:RVARGC_MAX_ALLOCATE_SIZE]
b = a.dup
c = nil
ObjectSpace.each_object(String) {|x| break c = x if x == a and x.frozen?}
ObjectSpace.each_object(String) {|x| break c = x if a == x and x.frozen?}
rv_size = GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE]
assert_equal([rv_size, rv_size, a.length + 1 + rv_size], [a, b, c].map {|x| ObjectSpace.memsize_of(x)})
end