Test Nested Transactions

test_database.rb

...

  def test_nested_transaction
    db = Database.new

    db.set "Pacific", "Baza"
    assert_equal(1, db.count("Baza"))

    db.begin
    db.set "Black", "Baza"

    assert_equal(2, db.count("Baza"))
    assert_equal("Baza", db.get("Black"))

    db.begin
    db.set "Jerdons", "Baza"

    assert_equal(3, db.count("Baza"))
    assert_equal("Baza", db.get("Jerdons"))

    db.rollback

    assert_equal(2, db.count("Baza"))
    assert_equal("Baza", db.get("Black"))
    assert_equal("Baza", db.get("Pacific"))

    db.commit

    assert_equal(2, db.count("Baza"))
    assert_equal("Baza", db.get("Pacific"))
    assert_equal("Baza", db.get("Black"))
    assert_equal("NULL", db.get("Jerdons"))

  end

...