Add some model tests (#9)

Reviewed-on: #9

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