test/fixtures/incomes.yml

@@ -1,13 +1,19 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
-one:
-  description: MyString
-  included: false
-  amount: 9.99
+included_1:
+  description: Salary
+  included: true
+  amount: 85_000.00
   member: one
 
-two:
-  description: MyString
+included_2:
+  description: Salary
+  included: true
+  amount: 15_000.00
+  member: one
+
+excluded:
+  description: Bonus
   included: false
-  amount: 9.99
-  member: two
+  amount: 10_000
+  member: one

test/models/income_test.rb

@@ -1,7 +1,7 @@
 require "test_helper"
 
 class IncomeTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  def test_total
+    assert_equal 100_000.00, Income.total
+  end
 end