moved test for bad coalescing into mainline

as coalescing can only run there

regression_tests/bug_1_6_2_test.rb

@@ -36,56 +36,4 @@ class Bug_1_6_2_Test < Minitest::Test
       session.close
     end
   end
-
-  def test_coalesce_should_not_leak_across_threads
-    uri = URI(build_uri("/get", "https://#{httpbin}"))
-    coalesced_uri = URI(build_uri("/get", "https://#{ENV["HTTPBIN_COALESCING_HOST"]}"))
-    q = Queue.new
-
-    http = HTTPX.plugin(SessionWithPool).plugin(:persistent)
-
-    registered_conns = Set[]
-    http.define_singleton_method(:select_connection) do |conn, selector|
-      registered_conns << [conn, selector]
-      super(conn, selector)
-    end
-
-    http.singleton_class.class_eval do
-      public(:get_current_selector)
-    end
-
-    th1 = Thread.start do
-      q.pop
-      res = http.get(coalesced_uri)
-      verify_status(res, 200)
-      http.get_current_selector
-    end
-
-    th2 = Thread.start do
-      res = http.get(uri)
-      verify_status(res, 200)
-      sel = http.get_current_selector
-      q << :done
-      sel
-    end
-
-    th2_selector = th2.value
-    th1_selector = th1.value
-
-    conns = http.connections.select(&:open?)
-    assert conns.size == 1
-    conn = conns.first
-    assert conn.current_session.nil?, "connection should have reset its session already"
-    assert conn.current_selector.nil?, "connection should have reset its selector already"
-
-    assert http.pool.connections_counter == 1, "connection"
-    assert http.pool.connections.include?(conn)
-
-    assert registered_conns.size == 2
-
-    assert registered_conns.include?([conn, th1_selector])
-    assert registered_conns.include?([conn, th2_selector])
-  ensure
-    http.close if defined?(http)
-  end
 end

test/https_test.rb

@@ -16,6 +16,7 @@ class HTTPSTest < Minitest::Test
   include Callbacks
   include Errors if RUBY_ENGINE == "ruby"
   include Resolvers if ENV.key?("HTTPX_RESOLVER_URI")
+  include Coalescing if ENV.key?("HTTPBIN_COALESCING_HOST")
   # TODO: uncomment as soon as nghttpx supports altsvc for HTTP/2
   # include AltSvc if ENV.key?("HTTPBIN_ALTSVC_HOST")
 
@@ -58,36 +59,6 @@ class HTTPSTest < Minitest::Test
     end
   end unless RUBY_ENGINE == "jruby"
 
-  def test_connection_coalescing
-    coalesced_origin = "https://#{ENV["HTTPBIN_COALESCING_HOST"]}"
-    HTTPX.plugin(SessionWithPool).wrap do |http|
-      response1 = http.get(origin)
-      verify_status(response1, 200)
-      response2 = http.get(coalesced_origin)
-      verify_status(response2, 200)
-      # introspection time
-      connections = http.connections
-      assert connections.size == 2
-      origins = connections.map(&:origins)
-      assert origins.any? { |orgs| orgs.sort == [origin, coalesced_origin].sort },
-             "connections for #{[origin, coalesced_origin]} didn't coalesce (expected connection with both origins (#{origins}))"
-
-      assert http.pool.connections_counter == 1, "coalesced connection should not have been accounted for in the pool"
-
-      unsafe_origin = URI(origin)
-      unsafe_origin.scheme = "http"
-      response3 = http.get(unsafe_origin)
-      verify_status(response3, 200)
-
-      # introspection time
-      connections = http.connections
-      assert connections.size == 3
-      origins = connections.map(&:origins)
-      refute origins.any?([origin]),
-             "connection coalesced inexpectedly (expected connection with both origins (#{origins}))"
-    end
-  end if ENV.key?("HTTPBIN_COALESCING_HOST")
-
   def test_verbose_log
     log = StringIO.new
     uri = build_uri("/get")