Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
+ ruby -Ilib test/test_async.rb
test/test_async.rb:28:in `<main>': uninitialized constant MiniTest (NameError)

class TestSinatraAsync < MiniTest::Unit::TestCase
                         ^^^^^^^^
Did you mean?  Minitest

File and Line: The error originated in the file test/test_async.rb on line 28.
Uninitialized Constant: The Ruby interpreter encountered a reference to the MiniTest constant, but it wasn't defined. This means the necessary library or gem isn't included in the build environment.
Missing Dependency: The MiniTest library is a popular testing framework for Ruby. Its absence suggests that the gem's dependencies aren't correctly configured or aren't available during the build process.