# encoding: UTF-8
require 'spec_helper'

RSpec.describe Mysql2::Client do
  context "using defaults file" do
    let(:cnf_file) { File.expand_path('../../my.cnf', __FILE__) }

    it "should not raise an exception for valid defaults group" do
      expect {
        opts = DatabaseCredentials['root'].merge(:default_file => cnf_file, :default_group => "test")
        @client = Mysql2::Client.new(opts)
      }.not_to raise_error
    end

    it "should not raise an exception without default group" do
      expect {
        @client = Mysql2::Client.new(DatabaseCredentials['root'].merge(:default_file => cnf_file))
      }.not_to raise_error
    end
  end

  it "should raise an exception upon connection failure" do
    expect {
      # The odd local host IP address forces the mysql client library to
      # use a TCP socket rather than a domain socket.
      Mysql2::Client.new DatabaseCredentials['root'].merge('host' => '127.0.0.2', 'port' => 999999)
    }.to raise_error(Mysql2::Error)
  end

  it "should raise an exception on create for invalid encodings" do
    expect {
      Mysql2::Client.new(DatabaseCredentials['root'].merge(:encoding => "fake"))
    }.to raise_error(Mysql2::Error)
  end

  it "should not raise an exception on create for a valid encoding" do
    expect {
      Mysql2::Client.new(DatabaseCredentials['root'].merge(:encoding => "utf8"))
    }.not_to raise_error

    expect {
      Mysql2::Client.new(DatabaseCredentials['root'].merge(:encoding => "big5"))
    }.not_to raise_error
  end

  Klient = Class.new(Mysql2::Client) do
    attr_reader :connect_args
    def connect(*args)
      @connect_args ||= []
      @connect_args << args
    end
  end

  it "should accept connect flags and pass them to #connect" do
    client = Klient.new :flags => Mysql2::Client::FOUND_ROWS
    expect(client.connect_args.last[6] & Mysql2::Client::FOUND_ROWS).to be > 0
  end

  it "should parse flags array" do
    client = Klient.new :flags => %w( FOUND_ROWS -PROTOCOL_41 )
    expect(client.connect_args.last[6] & Mysql2::Client::FOUND_ROWS).to eql(Mysql2::Client::FOUND_ROWS)
    expect(client.connect_args.last[6] & Mysql2::Client::PROTOCOL_41).to eql(0)
  end

  it "should parse flags string" do
    client = Klient.new :flags => "FOUND_ROWS -PROTOCOL_41"
    expect(client.connect_args.last[6] & Mysql2::Client::FOUND_ROWS).to eql(Mysql2::Client::FOUND_ROWS)
    expect(client.connect_args.last[6] & Mysql2::Client::PROTOCOL_41).to eql(0)
  end

  it "should default flags to (REMEMBER_OPTIONS, LONG_PASSWORD, LONG_FLAG, TRANSACTIONS, PROTOCOL_41, SECURE_CONNECTION)" do
    client = Klient.new
    client_flags = Mysql2::Client::REMEMBER_OPTIONS |
                   Mysql2::Client::LONG_PASSWORD |
                   Mysql2::Client::LONG_FLAG |
                   Mysql2::Client::TRANSACTIONS |
                   Mysql2::Client::PROTOCOL_41 |
                   Mysql2::Client::SECURE_CONNECTION
    expect(client.connect_args.last[6]).to eql(client_flags)
  end

  it "should execute init command" do
    options = DatabaseCredentials['root'].dup
    options[:init_command] = "SET @something = 'setting_value';"
    client = Mysql2::Client.new(options)
    result = client.query("SELECT @something;")
    expect(result.first['@something']).to eq('setting_value')
  end

  it "should send init_command after reconnect" do
    options = DatabaseCredentials['root'].dup
    options[:init_command] = "SET @something = 'setting_value';"
    options[:reconnect] = true
    client = Mysql2::Client.new(options)

    result = client.query("SELECT @something;")
    expect(result.first['@something']).to eq('setting_value')

    # get the current connection id
    result = client.query("SELECT CONNECTION_ID()")
    first_conn_id = result.first['CONNECTION_ID()']

    # break the current connection
    expect { client.query("KILL #{first_conn_id}") }.to raise_error(Mysql2::Error)

    client.ping # reconnect now

    # get the new connection id
    result = client.query("SELECT CONNECTION_ID()")
    second_conn_id = result.first['CONNECTION_ID()']

    # confirm reconnect by checking the new connection id
    expect(first_conn_id).not_to eq(second_conn_id)

    # At last, check that the init command executed
    result = client.query("SELECT @something;")
    expect(result.first['@something']).to eq('setting_value')
  end

  it "should have a global default_query_options hash" do
    expect(Mysql2::Client).to respond_to(:default_query_options)
  end

  it "should be able to connect via SSL options" do
    ssl = @client.query "SHOW VARIABLES LIKE 'have_ssl'"
    ssl_uncompiled = ssl.any? { |x| x['Value'] == 'OFF' }
    pending("DON'T WORRY, THIS TEST PASSES - but SSL is not compiled into your MySQL daemon.") if ssl_uncompiled
    ssl_disabled = ssl.any? { |x| x['Value'] == 'DISABLED' }
    pending("DON'T WORRY, THIS TEST PASSES - but SSL is not enabled in your MySQL daemon.") if ssl_disabled

    # You may need to adjust the lines below to match your SSL certificate paths
    ssl_client = nil
    expect {
      # rubocop:disable Style/TrailingComma
      ssl_client = Mysql2::Client.new(
        DatabaseCredentials['root'].merge(
          'host'     => 'mysql2gem.example.com', # must match the certificates
          :sslkey    => '/etc/mysql/client-key.pem',
          :sslcert   => '/etc/mysql/client-cert.pem',
          :sslca     => '/etc/mysql/ca-cert.pem',
          :sslcipher => 'DHE-RSA-AES256-SHA',
          :sslverify => true
        )
      )
      # rubocop:enable Style/TrailingComma
    }.not_to raise_error

    results = ssl_client.query("SHOW STATUS WHERE Variable_name = \"Ssl_version\" OR Variable_name = \"Ssl_cipher\"").to_a
    expect(results[0]['Variable_name']).to eql('Ssl_cipher')
    expect(results[0]['Value']).not_to be_nil
    expect(results[0]['Value']).to be_an_instance_of(String)
    expect(results[0]['Value']).not_to be_empty

    expect(results[1]['Variable_name']).to eql('Ssl_version')
    expect(results[1]['Value']).not_to be_nil
    expect(results[1]['Value']).to be_an_instance_of(String)
    expect(results[1]['Value']).not_to be_empty

    ssl_client.close
  end

  def run_gc
    if defined?(Rubinius)
      GC.run(true)
    else
      GC.start
    end
    sleep(0.5)
  end

  it "should terminate connections when calling close" do
    expect {
      Mysql2::Client.new(DatabaseCredentials['root']).close
    }.to_not change {
      @client.query("SHOW STATUS LIKE 'Aborted_clients'").first['Value'].to_i
    }
  end

  it "should not leave dangling connections after garbage collection" do
    run_gc

    client = Mysql2::Client.new(DatabaseCredentials['root'])
    before_count = client.query("SHOW STATUS LIKE 'Threads_connected'").first['Value'].to_i

    10.times do
      Mysql2::Client.new(DatabaseCredentials['root']).query('SELECT 1')
    end
    after_count = client.query("SHOW STATUS LIKE 'Threads_connected'").first['Value'].to_i
    expect(after_count).to eq(before_count + 10)

    run_gc
    final_count = client.query("SHOW STATUS LIKE 'Threads_connected'").first['Value'].to_i
    expect(final_count).to eq(before_count)
  end

  it "should not close connections when running in a child process" do
    pending("fork is not available on this platform") unless Process.respond_to?(:fork)

    run_gc
    client = Mysql2::Client.new(DatabaseCredentials['root'])

    # this empty `fork` call fixes this tests on RBX; without it, the next
    # `fork` call hangs forever. WTF?
    fork {}

    fork do
      client.query('SELECT 1')
      client = nil
      run_gc
    end

    Process.wait

    # this will throw an error if the underlying socket was shutdown by the
    # child's GC
    expect { client.query('SELECT 1') }.to_not raise_exception
  end

  it "should be able to connect to database with numeric-only name" do
    creds = DatabaseCredentials['numericuser']
    @client.query "CREATE DATABASE IF NOT EXISTS `#{creds['database']}`"
    @client.query "GRANT ALL ON `#{creds['database']}`.* TO #{creds['username']}@`#{creds['host']}`"

    expect { Mysql2::Client.new(creds) }.not_to raise_error

    @client.query "DROP DATABASE IF EXISTS `#{creds['database']}`"
  end

  it "should respond to #close" do
    expect(@client).to respond_to(:close)
  end

  it "should be able to close properly" do
    expect(@client.close).to be_nil
    expect {
      @client.query "SELECT 1"
    }.to raise_error(Mysql2::Error)
  end

  it "should respond to #query" do
    expect(@client).to respond_to(:query)
  end

  it "should respond to #warning_count" do
    expect(@client).to respond_to(:warning_count)
  end

  context "#warning_count" do
    context "when no warnings" do
      it "should 0" do
        @client.query('select 1')
        expect(@client.warning_count).to eq(0)
      end
    end
    context "when has a warnings" do
      it "should > 0" do
        # "the statement produces extra information that can be viewed by issuing a SHOW WARNINGS"
        # http://dev.mysql.com/doc/refman/5.0/en/explain-extended.html
        @client.query("explain extended select 1")
        expect(@client.warning_count).to be > 0
      end
    end
  end

  it "should respond to #query_info" do
    expect(@client).to respond_to(:query_info)
  end

  context "#query_info" do
    context "when no info present" do
      it "should 0" do
        @client.query('select 1')
        expect(@client.query_info).to be_empty
        expect(@client.query_info_string).to be_nil
      end
    end
    context "when has some info" do
      it "should retrieve it" do
        @client.query "USE test"
        @client.query "CREATE TABLE IF NOT EXISTS infoTest (`id` int(11) NOT NULL AUTO_INCREMENT, blah INT(11), PRIMARY KEY (`id`))"

        # http://dev.mysql.com/doc/refman/5.0/en/mysql-info.html says
        # # Note that mysql_info() returns a non-NULL value for INSERT ... VALUES only for the multiple-row form of the statement (that is, only if multiple value lists are specified).
        @client.query("INSERT INTO infoTest (blah) VALUES (1234),(4535)")

        expect(@client.query_info).to eql(:records => 2, :duplicates => 0, :warnings => 0)
        expect(@client.query_info_string).to eq('Records: 2  Duplicates: 0  Warnings: 0')

        @client.query "DROP TABLE infoTest"
      end
    end
  end

  context ":local_infile" do
    before(:all) do
      @client_i = Mysql2::Client.new DatabaseCredentials['root'].merge(:local_infile => true)
      local = @client_i.query "SHOW VARIABLES LIKE 'local_infile'"
      local_enabled = local.any? { |x| x['Value'] == 'ON' }
      pending("DON'T WORRY, THIS TEST PASSES - but LOCAL INFILE is not enabled in your MySQL daemon.") unless local_enabled

      @client_i.query %[
        CREATE TABLE IF NOT EXISTS infileTest (
          id MEDIUMINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
          foo VARCHAR(10),
          bar MEDIUMTEXT
        )
      ]
    end

    after(:all) do
      @client_i.query "DROP TABLE infileTest"
    end

    it "should raise an error when local_infile is disabled" do
      client = Mysql2::Client.new DatabaseCredentials['root'].merge(:local_infile => false)
      expect {
        client.query "LOAD DATA LOCAL INFILE 'spec/test_data' INTO TABLE infileTest"
      }.to raise_error(Mysql2::Error, /command is not allowed/)
    end

    it "should raise an error when a non-existent file is loaded" do
      expect {
        @client_i.query "LOAD DATA LOCAL INFILE 'this/file/is/not/here' INTO TABLE infileTest"
      }.to raise_error(Mysql2::Error, 'No such file or directory: this/file/is/not/here')
    end

    it "should LOAD DATA LOCAL INFILE" do
      @client_i.query "LOAD DATA LOCAL INFILE 'spec/test_data' INTO TABLE infileTest"
      info = @client_i.query_info
      expect(info).to eql(:records => 1, :deleted => 0, :skipped => 0, :warnings => 0)

      result = @client_i.query "SELECT * FROM infileTest"
      expect(result.first).to eql('id' => 1, 'foo' => 'Hello', 'bar' => 'World')
    end
  end

  it "should expect connect_timeout to be a positive integer" do
    expect {
      Mysql2::Client.new(:connect_timeout => -1)
    }.to raise_error(Mysql2::Error)
  end

  it "should expect read_timeout to be a positive integer" do
    expect {
      Mysql2::Client.new(:read_timeout => -1)
    }.to raise_error(Mysql2::Error)
  end

  it "should expect write_timeout to be a positive integer" do
    expect {
      Mysql2::Client.new(:write_timeout => -1)
    }.to raise_error(Mysql2::Error)
  end

  context "#query" do
    it "should let you query again if iterating is finished when streaming" do
      @client.query("SELECT 1 UNION SELECT 2", :stream => true, :cache_rows => false).each.to_a

      expect {
        @client.query("SELECT 1 UNION SELECT 2", :stream => true, :cache_rows => false)
      }.to_not raise_error
    end

    it "should not let you query again if iterating is not finished when streaming" do
      @client.query("SELECT 1 UNION SELECT 2", :stream => true, :cache_rows => false).first

      expect {
        @client.query("SELECT 1 UNION SELECT 2", :stream => true, :cache_rows => false)
      }.to raise_exception(Mysql2::Error)
    end

    it "should only accept strings as the query parameter" do
      expect {
        @client.query ["SELECT 'not right'"]
      }.to raise_error(TypeError)
    end

    it "should not retain query options set on a query for subsequent queries, but should retain it in the result" do
      result = @client.query "SELECT 1", :something => :else
      expect(@client.query_options[:something]).to be_nil
      expect(result.instance_variable_get('@query_options')).to eql(@client.query_options.merge(:something => :else))
      expect(@client.instance_variable_get('@current_query_options')).to eql(@client.query_options.merge(:something => :else))

      result = @client.query "SELECT 1"
      expect(result.instance_variable_get('@query_options')).to eql(@client.query_options)
      expect(@client.instance_variable_get('@current_query_options')).to eql(@client.query_options)
    end

    it "should allow changing query options for subsequent queries" do
      @client.query_options.merge!(:something => :else)
      result = @client.query "SELECT 1"
      expect(@client.query_options[:something]).to eql(:else)
      expect(result.instance_variable_get('@query_options')[:something]).to eql(:else)

      # Clean up after this test
      @client.query_options.delete(:something)
      expect(@client.query_options[:something]).to be_nil
    end

    it "should return results as a hash by default" do
      expect(@client.query("SELECT 1").first).to be_an_instance_of(Hash)
    end

    it "should be able to return results as an array" do
      expect(@client.query("SELECT 1", :as => :array).first).to be_an_instance_of(Array)
      @client.query("SELECT 1").each(:as => :array)
    end

    it "should be able to return results with symbolized keys" do
      expect(@client.query("SELECT 1", :symbolize_keys => true).first.keys[0]).to be_an_instance_of(Symbol)
    end

    it "should require an open connection" do
      @client.close
      expect {
        @client.query "SELECT 1"
      }.to raise_error(Mysql2::Error)
    end

    if RUBY_PLATFORM !~ /mingw|mswin/
      it "should not allow another query to be sent without fetching a result first" do
        @client.query("SELECT 1", :async => true)
        expect {
          @client.query("SELECT 1")
        }.to raise_error(Mysql2::Error)
      end

      it "should describe the thread holding the active query" do
        thr = Thread.new { @client.query("SELECT 1", :async => true) }

        thr.join
        expect { @client.query('SELECT 1') }.to raise_error(Mysql2::Error, Regexp.new(Regexp.escape(thr.inspect)))
      end

      it "should timeout if we wait longer than :read_timeout" do
        client = Mysql2::Client.new(DatabaseCredentials['root'].merge(:read_timeout => 0))
        expect {
          client.query('SELECT SLEEP(0.1)')
        }.to raise_error(Mysql2::Error)
      end

      # XXX this test is not deterministic (because Unix signal handling is not)
      # and may fail on a loaded system
      it "should run signal handlers while waiting for a response" do
        kill_time = 0.1
        query_time = 2 * kill_time

        mark = {}

        begin
          trap(:USR1) { mark.store(:USR1, Time.now) }
          pid = fork do
            sleep kill_time # wait for client query to start
            Process.kill(:USR1, Process.ppid)
            sleep # wait for explicit kill to prevent GC disconnect
          end
          mark.store(:QUERY_START, Time.now)
          @client.query("SELECT SLEEP(#{query_time})")
          mark.store(:QUERY_END, Time.now)
        ensure
          Process.kill(:TERM, pid)
          Process.waitpid2(pid)
          trap(:USR1, 'DEFAULT')
        end

        # the query ran uninterrupted
        expect(mark.fetch(:QUERY_END) - mark.fetch(:QUERY_START)).to be_within(0.02).of(query_time)
        # signals fired while the query was running
        expect(mark.fetch(:USR1)).to be_between(mark.fetch(:QUERY_START), mark.fetch(:QUERY_END))
      end

      it "#socket should return a Fixnum (file descriptor from C)" do
        expect(@client.socket).to be_an_instance_of(Fixnum)
        expect(@client.socket).not_to eql(0)
      end

      it "#socket should require an open connection" do
        @client.close
        expect {
          @client.socket
        }.to raise_error(Mysql2::Error)
      end

      it 'should be impervious to connection-corrupting timeouts in #query' do
        pending('`Thread.handle_interrupt` is not defined') unless Thread.respond_to?(:handle_interrupt)
        # attempt to break the connection
        expect { Timeout.timeout(0.1) { @client.query('SELECT SLEEP(0.2)') } }.to raise_error(Timeout::Error)

        # expect the connection to not be broken
        expect { @client.query('SELECT 1') }.to_not raise_error
      end

      it 'should be impervious to connection-corrupting timeouts in #execute' do
        # the statement handle gets corrupted and will segfault the tests if interrupted,
        # so we can't even use pending on this test, really have to skip it on older Rubies.
        skip('`Thread.handle_interrupt` is not defined') unless Thread.respond_to?(:handle_interrupt)

        # attempt to break the connection
        stmt = @client.prepare('SELECT SLEEP(?)')
        expect { Timeout.timeout(0.1) { stmt.execute(0.2) } }.to raise_error(Timeout::Error)
        stmt.close

        # expect the connection to not be broken
        expect { @client.query('SELECT 1') }.to_not raise_error
      end

      context 'when a non-standard exception class is raised' do
        it "should close the connection when an exception is raised" do
          expect { Timeout.timeout(0.1, ArgumentError) { @client.query('SELECT SLEEP(1)') } }.to raise_error(ArgumentError)
          expect { @client.query('SELECT 1') }.to raise_error(Mysql2::Error, 'closed MySQL connection')
        end

        it "should handle Timeouts without leaving the connection hanging if reconnect is true" do
          if RUBY_PLATFORM.include?('darwin') && Mysql2::Client.info.fetch(:version).start_with?('5.5')
            pending('libmysqlclient 5.5 on OSX is afflicted by an unknown bug that breaks this test. See #633 and #634.')
          end

          client = Mysql2::Client.new(DatabaseCredentials['root'].merge(:reconnect => true))

          expect { Timeout.timeout(0.1, ArgumentError) { client.query('SELECT SLEEP(1)') } }.to raise_error(ArgumentError)
          expect { client.query('SELECT 1') }.to_not raise_error
        end

        it "should handle Timeouts without leaving the connection hanging if reconnect is set to true after construction" do
          if RUBY_PLATFORM.include?('darwin') && Mysql2::Client.info.fetch(:version).start_with?('5.5')
            pending('libmysqlclient 5.5 on OSX is afflicted by an unknown bug that breaks this test. See #633 and #634.')
          end

          client = Mysql2::Client.new(DatabaseCredentials['root'])

          expect { Timeout.timeout(0.1, ArgumentError) { client.query('SELECT SLEEP(1)') } }.to raise_error(ArgumentError)
          expect { client.query('SELECT 1') }.to raise_error(Mysql2::Error)

          client.reconnect = true

          expect { Timeout.timeout(0.1, ArgumentError) { client.query('SELECT SLEEP(1)') } }.to raise_error(ArgumentError)
          expect { client.query('SELECT 1') }.to_not raise_error
        end
      end

      it "threaded queries should be supported" do
        sleep_time = 0.5

        # Note that each thread opens its own database connection
        threads = 5.times.map do
          Thread.new do
            client = Mysql2::Client.new(DatabaseCredentials.fetch('root'))
            client.query("SELECT SLEEP(#{sleep_time})")
            Thread.current.object_id
          end
        end

        # This timeout demonstrates that the threads are sleeping concurrently:
        # In the serial case, the timeout would fire and the test would fail
        values = Timeout.timeout(sleep_time * 1.1) { threads.map(&:value) }

        expect(values).to match_array(threads.map(&:object_id))
      end

      it "evented async queries should be supported" do
        # should immediately return nil
        expect(@client.query("SELECT sleep(0.1)", :async => true)).to eql(nil)

        io_wrapper = IO.for_fd(@client.socket)
        loops = 0
        loop do
          if IO.select([io_wrapper], nil, nil, 0.05)
            break
          else
            loops += 1
          end
        end

        # make sure we waited some period of time
        expect(loops >= 1).to be true

        result = @client.async_result
        expect(result).to be_an_instance_of(Mysql2::Result)
      end
    end

    context "Multiple results sets" do
      before(:each) do
        @multi_client = Mysql2::Client.new(DatabaseCredentials['root'].merge(:flags => Mysql2::Client::MULTI_STATEMENTS))
      end

      it "should raise an exception when one of multiple statements fails" do
        result = @multi_client.query("SELECT 1 AS 'set_1'; SELECT * FROM invalid_table_name; SELECT 2 AS 'set_2';")
        expect(result.first['set_1']).to be(1)
        expect {
          @multi_client.next_result
        }.to raise_error(Mysql2::Error)
        expect(@multi_client.next_result).to be false
      end

      it "returns multiple result sets" do
        expect(@multi_client.query("SELECT 1 AS 'set_1'; SELECT 2 AS 'set_2'").first).to eql('set_1' => 1)

        expect(@multi_client.next_result).to be true
        expect(@multi_client.store_result.first).to eql('set_2' => 2)

        expect(@multi_client.next_result).to be false
      end

      it "does not interfere with other statements" do
        @multi_client.query("SELECT 1 AS 'set_1'; SELECT 2 AS 'set_2'")
        @multi_client.store_result while @multi_client.next_result

        expect(@multi_client.query("SELECT 3 AS 'next'").first).to eq('next' => 3)
      end

      it "will raise on query if there are outstanding results to read" do
        @multi_client.query("SELECT 1; SELECT 2; SELECT 3")
        expect {
          @multi_client.query("SELECT 4")
        }.to raise_error(Mysql2::Error)
      end

      it "#abandon_results! should work" do
        @multi_client.query("SELECT 1; SELECT 2; SELECT 3")
        @multi_client.abandon_results!
        expect {
          @multi_client.query("SELECT 4")
        }.not_to raise_error
      end

      it "#more_results? should work" do
        @multi_client.query("SELECT 1 AS 'set_1'; SELECT 2 AS 'set_2'")
        expect(@multi_client.more_results?).to be true

        @multi_client.next_result
        @multi_client.store_result

        expect(@multi_client.more_results?).to be false
      end

      it "#more_results? should work with stored procedures" do
        @multi_client.query("DROP PROCEDURE IF EXISTS test_proc")
        @multi_client.query("CREATE PROCEDURE test_proc() BEGIN SELECT 1 AS 'set_1'; SELECT 2 AS 'set_2'; END")
        expect(@multi_client.query("CALL test_proc()").first).to eql('set_1' => 1)
        expect(@multi_client.more_results?).to be true

        @multi_client.next_result
        expect(@multi_client.store_result.first).to eql('set_2' => 2)

        @multi_client.next_result
        expect(@multi_client.store_result).to be_nil # this is the result from CALL itself

        expect(@multi_client.more_results?).to be false
      end
    end
  end

  it "should respond to #socket" do
    expect(@client).to respond_to(:socket)
  end

  if RUBY_PLATFORM =~ /mingw|mswin/
    it "#socket should raise as it's not supported" do
      expect {
        @client.socket
      }.to raise_error(Mysql2::Error)
    end
  end

  it "should respond to escape" do
    expect(Mysql2::Client).to respond_to(:escape)
  end

  context "escape" do
    it "should return a new SQL-escape version of the passed string" do
      expect(Mysql2::Client.escape("abc'def\"ghi\0jkl%mno")).to eql("abc\\'def\\\"ghi\\0jkl%mno")
    end

    it "should return the passed string if nothing was escaped" do
      str = "plain"
      expect(Mysql2::Client.escape(str).object_id).to eql(str.object_id)
    end

    it "should not overflow the thread stack" do
      expect {
        Thread.new { Mysql2::Client.escape("'" * 256 * 1024) }.join
      }.not_to raise_error
    end

    it "should not overflow the process stack" do
      expect {
        Thread.new { Mysql2::Client.escape("'" * 1024 * 1024 * 4) }.join
      }.not_to raise_error
    end

    unless RUBY_VERSION =~ /1.8/
      it "should carry over the original string's encoding" do
        str = "abc'def\"ghi\0jkl%mno"
        escaped = Mysql2::Client.escape(str)
        expect(escaped.encoding).to eql(str.encoding)

        str.encode!('us-ascii')
        escaped = Mysql2::Client.escape(str)
        expect(escaped.encoding).to eql(str.encoding)
      end
    end
  end

  it "should respond to #escape" do
    expect(@client).to respond_to(:escape)
  end

  context "#escape" do
    it "should return a new SQL-escape version of the passed string" do
      expect(@client.escape("abc'def\"ghi\0jkl%mno")).to eql("abc\\'def\\\"ghi\\0jkl%mno")
    end

    it "should return the passed string if nothing was escaped" do
      str = "plain"
      expect(@client.escape(str).object_id).to eql(str.object_id)
    end

    it "should not overflow the thread stack" do
      expect {
        Thread.new { @client.escape("'" * 256 * 1024) }.join
      }.not_to raise_error
    end

    it "should not overflow the process stack" do
      expect {
        Thread.new { @client.escape("'" * 1024 * 1024 * 4) }.join
      }.not_to raise_error
    end

    it "should require an open connection" do
      @client.close
      expect {
        @client.escape ""
      }.to raise_error(Mysql2::Error)
    end

    context 'when mysql encoding is not utf8' do
      before { pending('Encoding is undefined') unless defined?(Encoding) }

      let(:client) { Mysql2::Client.new(DatabaseCredentials['root'].merge(:encoding => "ujis")) }

      it 'should return a internal encoding string if Encoding.default_internal is set' do
        with_internal_encoding Encoding::UTF_8 do
          expect(client.escape("\u{30C6}\u{30B9}\u{30C8}")).to eq "\u{30C6}\u{30B9}\u{30C8}"
          expect(client.escape("\u{30C6}'\u{30B9}\"\u{30C8}")).to eq "\u{30C6}\\'\u{30B9}\\\"\u{30C8}"
        end
      end
    end
  end

  it "should respond to #info" do
    expect(@client).to respond_to(:info)
  end

  it "#info should return a hash containing the client version ID and String" do
    info = @client.info
    expect(info).to be_an_instance_of(Hash)
    expect(info).to have_key(:id)
    expect(info[:id]).to be_an_instance_of(Fixnum)
    expect(info).to have_key(:version)
    expect(info[:version]).to be_an_instance_of(String)
  end

  context "strings returned by #info" do
    before { pending('Encoding is undefined') unless defined?(Encoding) }

    it "should be tagged as ascii" do
      expect(@client.info[:version].encoding).to eql(Encoding::US_ASCII)
      expect(@client.info[:header_version].encoding).to eql(Encoding::US_ASCII)
    end
  end

  context "strings returned by .info" do
    before { pending('Encoding is undefined') unless defined?(Encoding) }

    it "should be tagged as ascii" do
      expect(Mysql2::Client.info[:version].encoding).to eql(Encoding::US_ASCII)
      expect(Mysql2::Client.info[:header_version].encoding).to eql(Encoding::US_ASCII)
    end
  end

  it "should respond to #server_info" do
    expect(@client).to respond_to(:server_info)
  end

  it "#server_info should return a hash containing the client version ID and String" do
    server_info = @client.server_info
    expect(server_info).to be_an_instance_of(Hash)
    expect(server_info).to have_key(:id)
    expect(server_info[:id]).to be_an_instance_of(Fixnum)
    expect(server_info).to have_key(:version)
    expect(server_info[:version]).to be_an_instance_of(String)
  end

  it "#server_info should require an open connection" do
    @client.close
    expect {
      @client.server_info
    }.to raise_error(Mysql2::Error)
  end

  context "strings returned by #server_info" do
    before { pending('Encoding is undefined') unless defined?(Encoding) }

    it "should default to the connection's encoding if Encoding.default_internal is nil" do
      with_internal_encoding nil do
        expect(@client.server_info[:version].encoding).to eql(Encoding::UTF_8)

        client2 = Mysql2::Client.new(DatabaseCredentials['root'].merge(:encoding => 'ascii'))
        expect(client2.server_info[:version].encoding).to eql(Encoding::ASCII)
      end
    end

    it "should use Encoding.default_internal" do
      with_internal_encoding Encoding::UTF_8 do
        expect(@client.server_info[:version].encoding).to eql(Encoding.default_internal)
      end

      with_internal_encoding Encoding::ASCII do
        expect(@client.server_info[:version].encoding).to eql(Encoding.default_internal)
      end
    end
  end

  it "should raise a Mysql2::Error exception upon connection failure" do
    expect {
      Mysql2::Client.new :host => "localhost", :username => 'asdfasdf8d2h', :password => 'asdfasdfw42'
    }.to raise_error(Mysql2::Error)

    expect {
      Mysql2::Client.new DatabaseCredentials['root']
    }.not_to raise_error
  end

  context 'write operations api' do
    before(:each) do
      @client.query "USE test"
      @client.query "CREATE TABLE IF NOT EXISTS lastIdTest (`id` BIGINT NOT NULL AUTO_INCREMENT, blah INT(11), PRIMARY KEY (`id`))"
    end

    after(:each) do
      @client.query "DROP TABLE lastIdTest"
    end

    it "should respond to #last_id" do
      expect(@client).to respond_to(:last_id)
    end

    it "#last_id should return a Fixnum, the from the last INSERT/UPDATE" do
      expect(@client.last_id).to eql(0)
      @client.query "INSERT INTO lastIdTest (blah) VALUES (1234)"
      expect(@client.last_id).to eql(1)
    end

    it "should respond to #last_id" do
      expect(@client).to respond_to(:last_id)
    end

    it "#last_id should return a Fixnum, the from the last INSERT/UPDATE" do
      @client.query "INSERT INTO lastIdTest (blah) VALUES (1234)"
      expect(@client.affected_rows).to eql(1)
      @client.query "UPDATE lastIdTest SET blah=4321 WHERE id=1"
      expect(@client.affected_rows).to eql(1)
    end

    it "#last_id should handle BIGINT auto-increment ids above 32 bits" do
      # The id column type must be BIGINT. Surprise: INT(x) is limited to 32-bits for all values of x.
      # Insert a row with a given ID, this should raise the auto-increment state
      @client.query "INSERT INTO lastIdTest (id, blah) VALUES (5000000000, 5000)"
      expect(@client.last_id).to eql(5000000000)
      @client.query "INSERT INTO lastIdTest (blah) VALUES (5001)"
      expect(@client.last_id).to eql(5000000001)
    end
  end

  it "should respond to #thread_id" do
    expect(@client).to respond_to(:thread_id)
  end

  it "#thread_id should be a Fixnum" do
    expect(@client.thread_id).to be_an_instance_of(Fixnum)
  end

  it "should respond to #ping" do
    expect(@client).to respond_to(:ping)
  end

  context "select_db" do
    before(:each) do
      2.times do |i|
        @client.query("CREATE DATABASE test_selectdb_#{i}")
        @client.query("USE test_selectdb_#{i}")
        @client.query("CREATE TABLE test#{i} (`id` int NOT NULL PRIMARY KEY)")
      end
    end

    after(:each) do
      2.times do |i|
        @client.query("DROP DATABASE test_selectdb_#{i}")
      end
    end

    it "should respond to #select_db" do
      expect(@client).to respond_to(:select_db)
    end

    it "should switch databases" do
      @client.select_db("test_selectdb_0")
      expect(@client.query("SHOW TABLES").first.values.first).to eql("test0")
      @client.select_db("test_selectdb_1")
      expect(@client.query("SHOW TABLES").first.values.first).to eql("test1")
      @client.select_db("test_selectdb_0")
      expect(@client.query("SHOW TABLES").first.values.first).to eql("test0")
    end

    it "should raise a Mysql2::Error when the database doesn't exist" do
      expect {
        @client.select_db("nopenothere")
      }.to raise_error(Mysql2::Error)
    end

    it "should return the database switched to" do
      expect(@client.select_db("test_selectdb_1")).to eq("test_selectdb_1")
    end
  end

  it "#thread_id should return a boolean" do
    expect(@client.ping).to eql(true)
    @client.close
    expect(@client.ping).to eql(false)
  end

  unless RUBY_VERSION =~ /1.8/
    it "should respond to #encoding" do
      expect(@client).to respond_to(:encoding)
    end
  end
end