You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wa_with_no_possible_records_to_return_test.rb
    path of file: ./repos/activerecord_where_assoc/test/tests/scoping
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "../../test_helper"

describe "wa" do
  let(:s0) { S0.create_default! }

  def check_association(association, &block)
    # With nothing at all
    assert !S0.where_assoc_count(1, :==, association).exists?, caller(0)
    assert !S0.where_assoc_count(1, :!=, association).exists?
    assert !S0.where_assoc_exists(association).exists?
    assert !S0.where_assoc_not_exists(association).exists?

    # With a record of the association
    assoc_record = S1.create_default!("S0_#{association}")
    assert !S0.where_assoc_count(1, :==, association).exists?
    assert !S0.where_assoc_count(1, :!=, association).exists?
    assert !S0.where_assoc_exists(association).exist
    
  def check_association(association, &block)
    # With nothing at all
    assert !S0.where_assoc_count(1, :==, association).exists?, caller(0)
    assert !S0.where_assoc_count(1, :!=, association).exists?
    assert !S0.where_assoc_exists(association).exists?
    assert !S0.where_assoc_not_exists(association).exists?

    # With a record of the association
    assoc_record = S1.create_default!("S0_#{association}")
    assert !S0.where_assoc_count(1, :==, association).exists?
    assert !S0.where_assoc_count(1, :!=, association).exists?
    assert !S0.where_assoc_exists(association).exists?
    assert !S0.where_assoc_not_exists(association).exists?

    # Also with a non-matching record in the source model
    s0
    assert_wa(0, association)

    # The block is to make sure that th scoping is done correctly. It must fix things up so
    # that there is now a match
    yield assoc_record

    assert_wa(1, association)
  rescue Minitest::Assertion
    # Adding more of the backtrace to the message to make it easier to know where things failed.
    raise $!, "#{$!}\n#{Minitest.filter_backtrace($!.backtrace).join("\n")}", $!.backtrace
  end

  it "always returns no result for belongs_to if no possible ones exists" do
    check_association(:b1) do |b1|
      s0.update!(s1_id: b1.id)
    end
  end

  it "always returns no result for has_and_belongs_to_many if no possible ones exists" do
    check_association(:z1) do |z1|
      s0.z1 << z1
    end
  end

  it "always returns no result for has_many if no possible ones exists" do
    check_association(:m1) do |m1|
      m1.update!(s0_id: s0.id)
    end
  end

  it "always returns no result for has_one if no possible ones exists" do
    skip if Test::SelectedDBHelper == Test::MySQL
    check_association(:o1) do |o1|
      o1.update!(s0_id: s0.id)
    end
  end

  it "always returns no result for polymorphic has_many if no possible ones exists" do
    check_association(:mp1) do |mp1|
      mp1.update!(has_s1s_poly_id: s0.id, has_s1s_poly_type: "S0")
    end
  end
end