Merge pull request #27188 from utilum/fix_sqlite3_test_error

test, don't connect to mysql when running sqlite3 tests.

activerecord/test/cases/invalid_connection_test.rb

@@ -1,22 +1,24 @@
 require "cases/helper"
 
-class TestAdapterWithInvalidConnection < ActiveRecord::TestCase
-  self.use_transactional_fixtures = false
-
-  class Bird < ActiveRecord::Base
-  end
-
-  def setup
-    # Can't just use current adapter; sqlite3 will create a database
-    # file on the fly.
-    Bird.establish_connection adapter: 'mysql', database: 'i_do_not_exist'
-  end
-
-  teardown do
-    Bird.remove_connection
-  end
-
-  test "inspect on Model class does not raise" do
-    assert_equal "#{Bird.name} (call '#{Bird.name}.connection' to establish a connection)", Bird.inspect
+if current_adapter?(:MysqlAdapter)
+  class TestAdapterWithInvalidConnection < ActiveRecord::TestCase
+    self.use_transactional_fixtures = false
+
+    class Bird < ActiveRecord::Base
+    end
+
+    def setup
+      # Can't just use current adapter; sqlite3 will create a database
+      # file on the fly.
+      Bird.establish_connection adapter: 'mysql', database: 'i_do_not_exist'
+    end
+
+    teardown do
+      Bird.remove_connection
+    end
+
+    test "inspect on Model class does not raise" do
+      assert_equal "#{Bird.name} (call '#{Bird.name}.connection' to establish a connection)", Bird.inspect
+    end
   end
 end