diff -r 000000000000 -r 811cd790a493 bttests.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bttests.py	Sun Jul 14 22:47:29 2013 -0400
@@ -0,0 +1,127 @@
+from budgettracker import Budget, Transaction, Decimal
+
+class Expect:
+    def __init__(self, *cmds, verbose = False):
+        self._cmds = cmds
+        self._index = 0
+        self.verbose = verbose
+    def __call__(self, prompt):
+        assert(self._index < len(self._cmds))
+        idx = self._index
+        self._index += 1
+        if self.verbose:
+            print("{:<20} => {}".format(prompt, self._cmds[idx]))
+        return self._cmds[idx]
+
+class Test:
+    def run(self):
+        self.test_load_save()
+        self.test_report(True)
+        self.test_envelops()
+        self.test_read_transaction()
+
+    def test_read_transaction(self, verbose = False):
+        cmds = [ "Salary", "400",
+                 "Taxes", "100",
+                 "Taxes", "-100",
+                 "Grocery", "200" ]
+        b = self.create_budget()
+        t = b.read_transaction(Expect(verbose = verbose, *(cmds + ["", "n"])))
+        assert(t is None)
+        t = b.read_transaction(Expect(verbose = verbose, *(cmds + ["", "y"])))
+        assert(t.amount == 400)
+        assert(t.budget["Taxes"] == 100)
+        assert(t.budget["Grocery"] == 200)
+        assert(len(t.budget) == 2)
+        assert(t.expenses["Taxes"] == 100)
+        assert(len(t.expenses) == 1)
+        assert(t.balance == 200)
+        t = b.read_transaction(Expect(verbose = verbose, *(cmds + ["Hobbies", "", "y"])))
+        assert(t.amount == 400)
+        assert(t.budget["Taxes"] == 100)
+        assert(t.budget["Grocery"] == 200)
+        assert(t.budget["Hobbies"] == 200)
+        assert(len(t.budget) == 3)
+        assert(t.expenses["Taxes"] == 100)
+        assert(len(t.expenses) == 1)
+        assert(t.balance == 0)
+
+    def create_budget(self):
+        b = Budget()
+        salary = Decimal(500)
+        taxes = salary * Decimal('0.20')
+        # Salary: 500 - 100 in taxes = 400
+        # Budget: 200$ in Grocery, 100$ for Taxes
+        # Expenses: Taxes 100$
+        # Unassigned: 200$
+        t = Transaction(name="Salary", amount=salary-taxes,
+                        budget = [("Grocery", Decimal(200)),
+                                  ("Taxes", taxes)],
+                        expenses = [("Taxes", taxes)])
+        b.add_transaction(t)
+        # Gift: 100$
+        # Budget: 100$ in Hobbies
+        t = Transaction(name = "Gift", amount = Decimal(100), envelop = "Hobbies")
+        b.add_transaction(t)
+        # Costco: -75$
+        # Expenses: 75$ in Grocery
+        t = Transaction(name="Costco", amount=Decimal(-75))
+        t.rebalance("Grocery")
+        b.add_transaction(t)
+        # Cinema: -50
+        # Expenses: 50$ in Hobbies
+        t = Transaction(name="Cinema", amount=Decimal(-50), envelop="Hobbies")
+        assert(t.balance == 0)
+        b.add_transaction(t)
+        # Missing money: -20$
+        # Unassigned: -20$
+        t = Transaction(name="Missing", amount=Decimal(-20))
+        b.add_transaction(t)
+        # Total:
+        # Budget: 200$ Grocery, 100$ Taxes, 100$ Hobbies = 400$
+        # Expenses: 100$ Taxes, 75$ Grocery, 50$ Hobbies = 225$
+        # Unassigned: 200$ Salary, -20$ Missing = 180$ 
+
+        b.set_envelop_description("Grocery", "stuff for stomach")
+        b.rename_envelop("Grocery", "Food")
+        return b
+
+    def test_load_save(self, verbose = False):
+        b = self.create_budget()
+
+        from io import StringIO
+        fp = StringIO()
+        b.save(fp)
+        saved = fp.getvalue()
+        if verbose: print(saved)
+
+        b2 = Budget()
+        b2.load(StringIO(saved))
+        fp = StringIO()
+        b2.save(fp)
+        saved2 = fp.getvalue()
+        if verbose: print(saved2)
+        assert(saved == saved2)
+
+    def test_envelops(self, verbose = False):
+        b = self.create_budget()
+        envelops = list(b.envelops)
+        assert(len(envelops) == 5)
+        total = envelops[-2]
+        unassigned = envelops[-1]
+
+        assert(total.budget == 400)
+        assert(total.expenses == 225)
+        assert(total.balance == 175)
+        assert(unassigned.budget == 200)
+        assert(unassigned.expenses == 20)
+        assert(unassigned.balance == 180)
+
+    def test_report(self, verbose = False):
+        b = self.create_budget()
+        for l in b.report():
+            if verbose:
+                print(l)
+
+if __name__ == '__main__':
+    Test().run()