Rails 4 Active Record Testing suite wants to truncate a table that doesn't exist

Question

Background

Hey, I'm attempting to get a broken testing suite for my Rails 4 application working.

I had a table called task_comments back somewhere in the history of the application and there were some changes that called for the table to be deleted. Which it is, just fine.

Rails: 4.2.11.3
Ruby: 2.3
Postgres: 15.2 (Debian 15.2-1.pgdg110+1)

The Problem

The problem seems to be something with how ActiveRecord works with Postgres when wiping the testing database and it's thinking task_comments is supposed to still be in the application.

The problem comes when I try to run a test file that looks like this:

require 'test_helper'

class ClientTest < ActiveSupport::TestCase
  test "the truth" do
    puts "asserting via test case"
    assert true
  end
end

I'm getting this issue:

$ rake test test/unit/client_test.rb

/usr/local/bundle/gems/mailman-rails-0.0.3/lib/mailman-rails/tasks/mailman.rake
Run options: --seed 29404

1) Error:
ClientTest#test_the_truth:
RuntimeError: Wrapped undumpable exception for: ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR:  relation "task_comments" does not exist
LINE 1: DELETE FROM "task_comments"

Work Done

What I've tried to correct the issue:

 RAILS_ENV=test rake db:drop;        # Removing the entire database
 RAILS_ENV=test rake db:create;      # Initializing the database
 RAILS_ENV=test rake db:schema:load; # Reloading the db:schema
 RAILS_ENV=test rake db:migrate      # Repoplulating database structure

Also note that when reloading the schema, the table task_comments is not loaded in, and it is NOT in schema.rb, so I'm kind of stuck here in running a testing suite.

Similar issue that doesn't solve the problem: PG::UndefinedTable: ERROR: table "table-name" does not exist