diff --git a/test/test_authenticatable.rb b/test/test_authenticatable.rb
index 0816ee5..7a6ff04 100644
--- a/test/test_authenticatable.rb
+++ b/test/test_authenticatable.rb
@@ -476,3 +476,125 @@ class AuthenticatableTest < Minitest::Test
     assert_equal 200, status_a
   end
 
+  def test_revoke_login_session_by_id_signs_out_only_that_device
+    browser_a_remember = cookie_named(multi_sign_in, 'remember_session_token')
+    browser_b_remember = cookie_named(multi_sign_in, 'remember_session_token')
+    browser_b_id = AuthLoginSession.order(:id, :desc).first.id
+
+    status, _, body = call('POST', "/multi/revoke/#{browser_b_id}", cookies: browser_a_remember)
+    assert_equal 200, status
+    assert_equal 'revoked', body.join
+
+    status_b, = call('GET', '/multi/dashboard', cookies: browser_b_remember)
+    assert_equal 302, status_b
+    status_a, = call('GET', '/multi/dashboard', cookies: browser_a_remember)
+    assert_equal 200, status_a
+  end
+
+  def test_revoke_login_session_refuses_a_session_belonging_to_another_user
+    AuthUser.create!(email: 'other@example.com', password: 'hunter2')
+    other_login = AuthLoginSession.create!(user_id: AuthUser.find_by(email: 'other@example.com').id)
+    browser_a_remember = cookie_named(multi_sign_in, 'remember_session_token')
+
+    status, _, body = call('POST', "/multi/revoke/#{other_login.id}", cookies: browser_a_remember)
+    assert_equal 404, status
+    assert_equal 'not found', body.join
+    refute_nil AuthLoginSession.find_by(id: other_login.id)
+  end
+
+  def test_revoking_the_current_login_session_signs_that_browser_out_too
+    browser_a_remember = cookie_named(multi_sign_in, 'remember_session_token')
+    current_id = AuthLoginSession.first.id
+
+    call('POST', "/multi/revoke/#{current_id}", cookies: browser_a_remember)
+
+    status, = call('GET', '/multi/dashboard', cookies: browser_a_remember)
+    assert_equal 302, status
+  end
+
+  def test_signing_in_without_remember_does_not_set_a_remember_session_cookie
+    headers = multi_sign_in(remember: false)
+    assert_nil cookie_named(headers, 'remember_session_token')
+    assert_equal 0, AuthLoginSession.count
+  end
+
+  def capped_sign_in
+    _, headers, = call('POST', '/capped/sign_in',
+                        headers: { 'Content-Type' => 'application/x-www-form-urlencoded' },
+                        body: 'email=foksiu@example.com&password=hunter2')
+    headers
+  end
+
+  def test_max_remember_sessions_requires_remember_sessions
+    error = assert_raises(ArgumentError) do
+      Class.new(Prism::Controller) do
+        include Prism::Authenticatable
+        authenticate_with model: :AuthUser, max_remember_sessions: 2
+      end
+    end
+    assert_match(/max_remember_sessions: requires remember_sessions:/, error.message)
+  end
+
+  def test_under_the_limit_keeps_every_browser
+    browser_a = cookie_named(capped_sign_in, 'remember_session_token')
+    browser_b = cookie_named(capped_sign_in, 'remember_session_token')
+    assert_equal 2, AuthLoginSession.count
+
+    status_a, = call('GET', '/capped/dashboard', cookies: browser_a)
+    status_b, = call('GET', '/capped/dashboard', cookies: browser_b)
+    assert_equal 200, status_a
+    assert_equal 200, status_b
+  end
+
+  def test_exceeding_the_limit_signs_out_the_oldest_browser_first
+    browser_a = cookie_named(capped_sign_in, 'remember_session_token')
+    browser_b = cookie_named(capped_sign_in, 'remember_session_token')
+    browser_c = cookie_named(capped_sign_in, 'remember_session_token')
+
+    assert_equal 2, AuthLoginSession.count
+
+    status_a, = call('GET', '/capped/dashboard', cookies: browser_a)
+    assert_equal 302, status_a, 'the oldest (first) browser should have been pruned'
+
+    status_b, = call('GET', '/capped/dashboard', cookies: browser_b)
+    status_c, = call('GET', '/capped/dashboard', cookies: browser_c)
+    assert_equal 200, status_b
+    assert_equal 200, status_c
+  end
+
+  def test_repeatedly_exceeding_the_limit_keeps_it_pinned_at_the_max
+    5.times { capped_sign_in }
+    assert_equal 2, AuthLoginSession.count
+  end
+
+  def zero_capped_sign_in
+    call('POST', '/zero-capped/sign_in',
+         headers: { 'Content-Type' => 'application/x-www-form-urlencoded' },
+         body: 'email=foksiu@example.com&password=hunter2')
+  end
+
+  # `max_remember_sessions: 0` is a deliberately-set "never actually
+  # remembered" limit (see the comment on prune_oldest_login_sessions) -
+  # unlike every positive limit above, it must prune the row `sign_in`
+  # itself just created, not just older ones.
+  def test_max_remember_sessions_of_zero_prunes_the_row_it_just_created
+    status, headers, = zero_capped_sign_in
+    assert_equal 200, status
+    assert_equal 0, AuthLoginSession.count,
+                 'a limit of 0 must prune the just-created row too, not only rows older than it'
+
+    session_cookie = session_cookie_from(headers)
+    refute_nil session_cookie, 'sign_in always sets the plain session cookie regardless of the remember-row prune'
+    status, = call('GET', '/zero-capped/dashboard', cookies: session_cookie)
+    assert_equal 200, status, 'the session cookie set by this very sign_in must still authenticate the request'
+  end
+
+  def test_max_remember_sessions_of_zero_makes_the_remember_cookie_dead_on_arrival
+    _, headers, = zero_capped_sign_in
+    remember_cookie = cookie_named(headers, 'remember_session_token')
+    refute_nil remember_cookie, 'sign_in(remember: true) sets the cookie unconditionally, before the prune runs'
+
+    status, = call('GET', '/zero-capped/dashboard', cookies: remember_cookie)
+    assert_equal 302, status, 'the remember cookie token matches no row once the limit-0 prune destroyed it'
+  end
+end