First sketch of budgeting module

test/models/transfer_matcher_test.rb

@@ -0,0 +1,28 @@
+require "test_helper"
+
+class TransferMatcherTest < ActiveSupport::TestCase
+  include Account::EntriesTestHelper
+
+  setup do
+    @family = families(:dylan_family)
+    @matcher = TransferMatcher.new(@family)
+  end
+
+  test "matches entries with opposite amounts and different accounts within 4 days" do
+    entry1 = create_transaction(account: accounts(:depository), amount: 100, date: Date.current)
+    entry2 = create_transaction(account: accounts(:credit_card), amount: -100, date: 2.days.ago.to_date)
+
+    assert_difference "Account::Transfer.count", 1 do
+      @matcher.match!([ entry1, entry2 ])
+    end
+  end
+
+  test "doesn't match entries more than 4 days apart" do
+    entry1 = create_transaction(account: accounts(:depository), amount: 100, date: Date.current)
+    entry2 = create_transaction(account: accounts(:credit_card), amount: -100, date: Date.current + 5.days)
+
+    assert_no_difference "Account::Transfer.count" do
+      @matcher.match!([ entry1, entry2 ])
+    end
+  end
+end