diff --git a/test/controllers/expenses_controller_test.rb b/test/controllers/expenses_controller_test.rb
index 4f218a6..4a69bbb 100644
--- a/test/controllers/expenses_controller_test.rb
+++ b/test/controllers/expenses_controller_test.rb
@@ -2,7 +2,7 @@ require "test_helper"
 
 class ExpensesControllerTest < ActionDispatch::IntegrationTest
   setup do
-    @expense = expenses(:one)
+    @expense = expenses(:monthly_expense)
   end
 
   test "should get index" do
diff --git a/test/controllers/incomes_controller_test.rb b/test/controllers/incomes_controller_test.rb
index 361a2f4..ced234a 100644
--- a/test/controllers/incomes_controller_test.rb
+++ b/test/controllers/incomes_controller_test.rb
@@ -2,7 +2,7 @@ require "test_helper"
 
 class IncomesControllerTest < ActionDispatch::IntegrationTest
   setup do
-    @income = incomes(:one)
+    @income = incomes(:included_1)
   end
 
   test "should get index" do
diff --git a/test/fixtures/credit_card_bills.yml b/test/fixtures/credit_card_bills.yml
index ca0607b..4aa6d0c 100644
--- a/test/fixtures/credit_card_bills.yml
+++ b/test/fixtures/credit_card_bills.yml
@@ -1,9 +1,5 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
 one:
-  description: MyString
-  amount: 9.99
-
-two:
-  description: MyString
-  amount: 9.99
+  description: Credit Card Bill One
+  amount: 1_000.00
diff --git a/test/fixtures/expenses.yml b/test/fixtures/expenses.yml
index 3c0ef47..5e267f5 100644
--- a/test/fixtures/expenses.yml
+++ b/test/fixtures/expenses.yml
@@ -1,15 +1,29 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
-one:
-  description: MyString
-  payment: 9.99
-  period: 1
+monthly_expense:
+  description: Monthly Expense
+  payment: 120.00
+  period: monthly
+  credit_card: true
+  estimated: false
+
+annual_expense:
+  description: Annual Expense
+  payment: 120.00
+  period: annually
+  credit_card: true
+  estimated: false
+
+weekly_expense:
+  description: Weekly Expense
+  payment: 120.00
+  period: weekly
   credit_card: false
   estimated: false
 
-two:
-  description: MyString
-  payment: 9.99
-  period: 1
+quarterly_expense:
+  description: Quarterly Expense
+  payment: 120.00
+  period: quarterly
   credit_card: false
   estimated: false
diff --git a/test/fixtures/incomes.yml b/test/fixtures/incomes.yml
index 7bf8b25..f6d8fb0 100644
--- a/test/fixtures/incomes.yml
+++ b/test/fixtures/incomes.yml
@@ -1,13 +1,25 @@
 # 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
+  amount: 10_000
+  member: one
+
+another_included:
+  description: Salary
+  included: true
+  amount: 10_000.00
   member: two
diff --git a/test/models/credit_card_bill_test.rb b/test/models/credit_card_bill_test.rb
index f0558a5..d40a388 100644
--- a/test/models/credit_card_bill_test.rb
+++ b/test/models/credit_card_bill_test.rb
@@ -1,7 +1,9 @@
 require "test_helper"
 
 class CreditCardBillTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  def test_unpaid
+    credit_card_bill = credit_card_bills(:one)
+
+    assert_equal 870.00, credit_card_bill.unpaid
+  end
 end
diff --git a/test/models/expense_test.rb b/test/models/expense_test.rb
index 67ac22a..97e0831 100644
--- a/test/models/expense_test.rb
+++ b/test/models/expense_test.rb
@@ -1,7 +1,39 @@
 require "test_helper"
 
 class ExpenseTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  def test_monthly_converts_period_for_monthly
+    expense = expenses(:monthly_expense)
+
+    assert_equal 120.00, expense.monthly
+  end
+
+  def test_monthly_converts_period_for_annually
+    expense = expenses(:annual_expense)
+
+    assert_equal 10.00, expense.monthly
+  end
+
+  def test_monthly_converts_period_for_weekly
+    expense = expenses(:weekly_expense)
+
+    assert_equal 520.00, expense.monthly
+  end
+
+  def test_monthly_converts_period_for_quarterly
+    expense = expenses(:quarterly_expense)
+
+    assert_equal 40.00, expense.monthly
+  end
+
+  def test_total_calculates_total_of_expenses
+    assert_equal 480.00, Expense.total
+  end
+
+  def test_total_calculates_monthly_total
+    assert_equal 690.00, Expense.monthly_total
+  end
+
+  def test_total_calculates_credit_card_monthly_total
+    assert_equal 130.00, Expense.credit_card_monthly_total
+  end
 end
diff --git a/test/models/income_test.rb b/test/models/income_test.rb
index 0b7dc86..2b682fe 100644
--- a/test/models/income_test.rb
+++ b/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 110_000.00, Income.total
+  end
 end
diff --git a/test/models/member_test.rb b/test/models/member_test.rb
index 4fec230..d98f1f5 100644
--- a/test/models/member_test.rb
+++ b/test/models/member_test.rb
@@ -1,7 +1,27 @@
 require "test_helper"
 
 class MemberTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  def member
+    members(:one)
+  end
+
+  def test_income
+    assert_equal 110_000.00, member.income
+  end
+
+  def test_included_income
+    assert_equal 100_000.00, member.included_income
+  end
+
+  def test_others_included_income
+    assert_equal 10_000.00, member.others_included_income
+  end
+
+  def test_burden_percent
+    assert_equal 0.91, member.burden_percent
+  end
+
+  def test_burden_amount
+    assert_equal 627.90, member.burden_amount
+  end
 end
diff --git a/test/system/expenses_test.rb b/test/system/expenses_test.rb
index abb3fe9..9d162d8 100644
--- a/test/system/expenses_test.rb
+++ b/test/system/expenses_test.rb
@@ -2,7 +2,7 @@ require "application_system_test_case"
 
 class ExpensesTest < ApplicationSystemTestCase
   setup do
-    @expense = expenses(:one)
+    @expense = expenses(:monthly_expense)
   end
 
   test "visiting the index" do
diff --git a/test/system/incomes_test.rb b/test/system/incomes_test.rb
index ab77bf0..7a6863c 100644
--- a/test/system/incomes_test.rb
+++ b/test/system/incomes_test.rb
@@ -2,7 +2,7 @@ require "application_system_test_case"
 
 class IncomesTest < ApplicationSystemTestCase
   setup do
-    @income = incomes(:one)
+    @income = incomes(:included_1)
   end
 
   test "visiting the index" do