Enable the sqlite3 in-memory test connection to work

activerecord/test/cases/helper.rb

@@ -26,6 +26,11 @@ def current_adapter?(*types)
   end
 end
 
+def in_memory_db?
+  current_adapter?(:SQLiteAdapter) &&
+  ActiveRecord::Base.connection_pool.spec.config[:database] == ":memory:"
+end
+
 def with_env_tz(new_tz = 'US/Eastern')
   old_tz, ENV['TZ'] = ENV['TZ'], new_tz
   yield
@@ -100,11 +105,11 @@ class ActiveSupport::TestCase
   end
 end
 
-# silence verbose schema loading
-original_stdout = $stdout
-$stdout = StringIO.new
+def load_schema
+  # silence verbose schema loading
+  original_stdout = $stdout
+  $stdout = StringIO.new
 
-begin
   adapter_name = ActiveRecord::Base.connection.adapter_name.downcase
   adapter_specific_schema_file = SCHEMA_ROOT + "/#{adapter_name}_specific_schema.rb"
 
@@ -117,6 +122,8 @@ ensure
   $stdout = original_stdout
 end
 
+load_schema
+
 class << Time
   unless method_defined? :now_before_time_travel
     alias_method :now_before_time_travel, :now
@@ -133,4 +140,3 @@ class << Time
     @now = nil
   end
 end
-

activerecord/test/cases/locking_test.rb

@@ -252,13 +252,13 @@ end
 
 # TODO: The Sybase, and OpenBase adapters currently have no support for pessimistic locking
 
-unless current_adapter?(:SybaseAdapter, :OpenBaseAdapter)
+unless current_adapter?(:SybaseAdapter, :OpenBaseAdapter) || in_memory_db?
   class PessimisticLockingTest < ActiveRecord::TestCase
     self.use_transactional_fixtures = false
     fixtures :people, :readers
 
     def setup
-      Person.connection_pool.clear_reloadable_connections!
+      Person.connection_pool.clear_reloadable_connections
       # Avoid introspection queries during tests.
       Person.columns; Reader.columns
     end

activerecord/test/cases/pooled_connections_test.rb

@@ -137,4 +137,4 @@ class PooledConnectionsTest < ActiveRecord::TestCase
   def add_record(name)
     ActiveRecord::Base.connection_pool.with_connection { Project.create! :name => name }
   end
-end unless %w(FrontBase).include? ActiveRecord::Base.connection.adapter_name
+end unless current_adapter?(:FrontBase) || in_memory_db?

activerecord/test/cases/unconnected_test.rb

@@ -14,6 +14,7 @@ class TestUnconnectedAdapter < ActiveRecord::TestCase
   def teardown
     @underlying = nil
     ActiveRecord::Base.establish_connection(@specification)
+    load_schema if in_memory_db?
   end
 
   def test_connection_no_longer_established

activerecord/test/connections/native_sqlite3/in_memory_connection.rb

@@ -1,4 +1,8 @@
-print "Using native SQLite3\n"
+# This file connects to an in-memory SQLite3 database, which is a very fast way to run the tests.
+# The downside is that disconnect from the database results in the database effectively being
+# wiped. For this reason, pooled_connections_test.rb is disabled when using an in-memory database.
+
+print "Using native SQLite3 (in memory)\n"
 require_dependency 'models/course'
 require 'logger'
 ActiveRecord::Base.logger = Logger.new("debug.log")
@@ -6,13 +10,10 @@ ActiveRecord::Base.logger = Logger.new("debug.log")
 class SqliteError < StandardError
 end
 
-def make_connection(clazz, db_definitions_file)
-  clazz.establish_connection(:adapter => 'sqlite3', :database  => ':memory:')
-  File.read(SCHEMA_ROOT + "/#{db_definitions_file}").split(';').each do |command|
-    clazz.connection.execute(command) unless command.strip.empty?
-  end
+def make_connection(clazz)
+  ActiveRecord::Base.configurations = { clazz.name => { :adapter => 'sqlite3', :database  => ':memory:' } }
+  clazz.establish_connection(clazz.name)
 end
 
-make_connection(ActiveRecord::Base, 'sqlite.sql')
-make_connection(Course, 'sqlite2.sql')
-load(SCHEMA_ROOT + "/schema.rb")
+make_connection(ActiveRecord::Base)
+make_connection(Course)