check_active_record_timestamps_nullability.rb

require "bundler/inline"

gemfile do
  source "https://rubygems.org"

  gem "activerecord", "5.2.1", require: "active_record"
  gem "sqlite3"
end

ActiveRecord::Base.establish_connection(
  adapter: "sqlite3",
  database: ":memory:",
)

ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Migration[4.2].create_table :ar42s do |t|
  t.timestamps
end

ActiveRecord::Migration[5.2].create_table :ar52s do |t|
  t.timestamps
end

class Ar42 < ActiveRecord::Base
end

class Ar52 < ActiveRecord::Base
end

require "minitest/autorun"

class ExampleTest < Minitest::Test
  def test_ar42_timestamps_nullability
    created_at_column = Ar42.columns[1]
    assert(created_at_column.null)
  end

  def test_ar52_timestamps_nullability
    created_at_column = Ar52.columns[1]
    assert(!created_at_column.null)
  end
end

-- create_table(:ar42s)
D, [2018-09-20T21:08:26.601571 #16295] DEBUG -- :    (1.6ms)  SELECT sqlite_version(*)
D, [2018-09-20T21:08:26.602120 #16295] DEBUG -- :    (0.4ms)  CREATE TABLE "ar42s" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "created_at" datetime NOT NULL, "updated_at" datetime NOT NULL)
   -> 0.0047s
-- create_table(:ar52s)
D, [2018-09-20T21:08:26.602546 #16295] DEBUG -- :    (0.1ms)  CREATE TABLE "ar52s" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "created_at" datetime NOT NULL, "updated_at" datetime NOT NULL)
   -> 0.0004s
Run options: --seed 31879

# Running:

F.

Finished in 0.004420s, 452.4887 runs/s, 452.4887 assertions/s.

  1) Failure:
ExampleTest#test_ar42_timestamps_nullability [/Users/r7kamura/Desktop/test.rb:36]:
Expected false to be truthy.

2 runs, 2 assertions, 1 failures, 0 errors, 0 skips