Issue #15746 has been reported by sandy-lcq (sandy li).

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Bug #15746: 12 test failed 
https://bugs.ruby-lang.org/issues/15746

* Author: sandy-lcq (sandy li)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.2
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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Below problem is find on 2.5.3 and also 2.6.2. 
and ruby is compiled from source.


below test failed:
ruby test_delegate.rb
ruby test_forwardable.rb
ruby test_pstore.rb
ruby test_securerandom.rb
ruby test_tempfile.rb
ruby test_time.rb
ruby test_timeout.rb
ruby test_tmpdir.rb
ruby test_weakref.rb


ruby test_extlibs.rb
ruby test_open3.rb
ruby test_tracer.rb


**The top nine mainly failed like:**

Error: test_error_handling(TestCMath):
  NoMethodError: undefined method `assert_raise_with_message' for #<TestCMath:0x000056300b0c5800>
  Did you mean?  assert_raise_message

As I checked,  assert_raise_with_message exist in stdlib 2.1.2  -> Test::Unit::Assertions.
refer: 
https://ruby-doc.org/stdlib-2.1.2/libdoc/test/unit/rdoc/Test/Unit/Assertions.html

but for ruby 2.6.2, Test::Unit::Assertions don't have this method.


test_cmath.rb:31:in `test_log'
Error: test_log(TestCMath): RangeError: can't convert 0.8047189562170503+1.1071487177940904i into Float

assert_in_delta exist in test/unit/assertion.rb, but require argument be float.

**above problem can be solved by add "require 'minitest/autorun'"
**


The last 3 tests failed like:
Traceback (most recent call last):
	2: from test_extlibs.rb:2:in `<main>'
	1: from /usr/lib64/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/usr/lib64/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- envutil (LoadError)


Traceback (most recent call last):
	1: from test_open3.rb:8:in `<main>'
test_open3.rb:9:in `<class:TestOpen3>': uninitialized constant TestOpen3::EnvUtil (NameError)


I checked there is envutil.rb under test/lib/envutil.rb, but envutil is not installed under /usr/lib/ruby/...,
so I guess maybe when I compile ruby, I should enable some feature for this?  Could expert at this point it out? Thanks.
or Maybe it is a problem of Makefile.in





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