Fix Channels Controller tests

app/models/channel.rb

@@ -1,13 +1,13 @@
 class Channel < ApplicationRecord
   belongs_to :creator, class_name: "User", foreign_key: :user_id, optional: true
 
-  has_many :memberships
+  has_many :memberships, dependent: :destroy
   has_many :members, through: :memberships, source: :user
 
   has_many :active_memberships, -> { kept }, class_name: "Membership"
   has_many :active_members, through: :active_memberships, source: :user
 
-  has_many :messages, as: :recipient
+  has_many :messages, as: :recipient, dependent: :destroy
 
   validates :name, length: { maximum: 80 }, presence: true, uniqueness: true
   validates :description, length: { maximum: 240 }

test/controllers/channels_controller_test.rb

@@ -20,7 +20,7 @@ class ChannelsControllerTest < ActionDispatch::IntegrationTest
 
   test "should create channel" do
     assert_difference('Channel.count') do
-      post channels_url, params: { channel: { description: @channel.description, name: @channel.name, user_id: @channel.user_id } }
+      post channels_url, params: { channel: { description: @channel.description, name: @channel.name + "_unique", user_id: @channel.user_id } }
     end
 
     assert_redirected_to channel_url(Channel.last)

test/fixtures/channels.yml

@@ -1,11 +1,11 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
 one:
-  name: MyString
+  name: ChannelName1
   description: MyText
   creator: one
 
 two:
-  name: MyString
+  name: ChannelName2
   description: MyText
   creator: two