Add a test for sqlite schema tool

[franmomu]

I was trying to reproduce the bug found in doctrine/data-fixtures#452, so in 3.x should fail.

In 3.0.x this is the output:

CREATE TABLE readers.user (id INTEGER NOT NULL, PRIMARY KEY(id))
CREATE TABLE readers.author_reader (author_id INTEGER NOT NULL, reader_id INTEGER NOT NULL, PRIMARY KEY(author_id, reader_id), CONSTRAINT FK_3155D2E5F675F31B FOREIGN KEY (author_id) REFERENCES readers.user (id) NOT DEFERRABLE INITIALLY IMMEDIATE, CONSTRAINT FK_3155D2E51717D737 FOREIGN KEY (reader_id) REFERENCES readers.user (id) NOT DEFERRABLE INITIALLY IMMEDIATE)
CREATE INDEX IDX_3155D2E5F675F31B ON readers.author_reader (author_id)
CREATE INDEX IDX_3155D2E51717D737 ON readers.author_reader (reader_id)

Update: Related to #9259 so I guess this can be closed

[SenseException]

Please move this up before the other asserts.

[franmomu]

thanks @SenseException for the review, but I guess this can be closed since it was fixed in dbal