added a test for when an http/2 connection exhausts and a second connection has to be established

lib/httpx/connection/http2.rb

@@ -51,10 +51,6 @@ module HTTPX
       :rw
     end
 
-    def reset
-      init_connection
-    end
-
     def close(*args)
       @connection.goaway(*args) unless @connection.state == :closed
       emit(:close)
@@ -163,6 +159,9 @@ module HTTPX
       @connection.send_connection_preface
     end
 
+    alias_method :reset, :init_connection
+    public :reset
+
     def handle_stream(stream, request)
       stream.on(:close, &method(:on_stream_close).curry[stream, request])
       stream.on(:half_close) do

test/https_test.rb

@@ -75,6 +75,16 @@ class HTTPSTest < Minitest::Test
     assert log_output.match(/HEADER: content-length: \d+/)
   end
 
+  def test_http2_max_streams
+    uri = build_uri("/get")
+    HTTPX.plugin(SessionWithSingleStream).plugin(SessionWithPool).wrap do |http|
+      http.get(uri, uri)
+      connection_count = http.pool.connection_count
+      assert connection_count == 2, "expected to have 2 connections, instead have #{connection_count}"
+      assert http.connection_exausted, "expected 1 connnection to have exhausted"
+    end
+  end
+
   private
 
   def origin(orig = httpbin)

test/support/session_with_single_stream.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+#
+# This module is used only to test transitions from a full HTTP/2 connection when it
+# exhausts the number of streamss
+#
+module SessionWithSingleStream
+  module ConnectionMethods
+    def build_parser
+      parser = super
+      def parser.exhausted?
+        @connection.active_stream_count.positive?
+      end
+      parser.instance_variable_set(:@max_requests, 10)
+      connection = parser.instance_variable_get(:@connection)
+      connection.max_streams = 1
+      parser
+    end
+  end
+
+  module InstanceMethods
+    attr_reader :connection_exausted
+
+    def set_connection_callbacks(connection, connections, options)
+      super
+      connection.on(:exhausted) do
+        @connection_exausted = true
+      end
+    end
+  end
+end