From 18dcb5a598d29a4c0b4b08a5fc8362225886f319 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Tue, 11 Apr 2017 15:07:12 +0300
Subject: Add assertion functions

---
 yarnutils/__init__.py      | 10 +++++++
 yarnutils/asserts.py       | 66 ++++++++++++++++++++++++++++++++++++++++++++
 yarnutils/asserts_tests.py | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 144 insertions(+)
 create mode 100644 yarnutils/asserts.py
 create mode 100644 yarnutils/asserts_tests.py

(limited to 'yarnutils')

diff --git a/yarnutils/__init__.py b/yarnutils/__init__.py
index 58f0236..ffcbaaa 100644
--- a/yarnutils/__init__.py
+++ b/yarnutils/__init__.py
@@ -18,3 +18,13 @@
 
 from .vars import Variables
 from .matches import get_next_match, set_env_for_matches
+from .asserts import (
+    AssertError,
+    assertTrue,
+    assertFalse,
+    assertEqual,
+    assertNotEqual,
+    assertGreaterThan,
+    assertLessThan,
+    assertIn,
+)
diff --git a/yarnutils/asserts.py b/yarnutils/asserts.py
new file mode 100644
index 0000000..aea055d
--- /dev/null
+++ b/yarnutils/asserts.py
@@ -0,0 +1,66 @@
+# Copyright 2017  Lars Wirzenius
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# =*= License: GPL-3+ =*=
+
+
+class AssertError(Exception):
+
+    pass
+
+
+def assertTrue(thing):
+    if not thing:
+        raise AssertError('expected {!r} to be true'.format(thing))
+
+
+def assertFalse(thing):
+    if thing:
+        raise AssertError('expected {!r} to be false'.format(thing))
+
+
+def assertEqual(a, b):
+    if a != b:
+        raise AssertError(
+            'expected {!r} and {!r} to be equal, but they are not'.format(
+                a, b))
+
+
+def assertNotEqual(a, b):
+    if a == b:
+        raise AssertError(
+            'expected {!r} and {!r} to be different, but they are not'.format(
+                a, b))
+
+
+def assertGreaterThan(a, b):
+    if a <= b:
+        raise AssertError(
+            'expected {!r} > {!r}, but am disappoint'.format(
+                a, b))
+
+
+def assertLessThan(a, b):
+    if a >= b:
+        raise AssertError(
+            'expected {!r} < {!r}, but am disappoint'.format(
+                a, b))
+
+
+def assertIn(a, b):
+    if a not in b:
+        raise AssertError(
+            'expected {!r} in {!r}, but am disappoint'.format(
+                a, b))
diff --git a/yarnutils/asserts_tests.py b/yarnutils/asserts_tests.py
new file mode 100644
index 0000000..dd3d4e8
--- /dev/null
+++ b/yarnutils/asserts_tests.py
@@ -0,0 +1,68 @@
+# Copyright 2017  Lars Wirzenius
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# =*= License: GPL-3+ =*=
+
+
+import unittest
+
+import yarnutils
+
+
+class AssertTests(unittest.TestCase):
+
+    def test_true_and_false_work(self):
+        truths = [
+            True, 1, "notempty", [0], (0,), {'foo': 0},
+        ]
+        falsehoods = [
+            None, False, 0, "", [], {},
+        ]
+
+        for thing in truths:
+            yarnutils.assertTrue(thing)
+            with self.assertRaises(yarnutils.AssertError):
+                yarnutils.assertFalse(thing)
+
+        for thing in falsehoods:
+            yarnutils.assertFalse(thing)
+            with self.assertRaises(yarnutils.AssertError):
+                yarnutils.assertTrue(thing)
+
+    def test_equal_works(self):
+        yarnutils.assertEqual(0, 0)
+        with self.assertRaises(yarnutils.AssertError):
+            yarnutils.assertEqual("foo", None)
+
+    def test_not_equal_works(self):
+        yarnutils.assertNotEqual(0, 1)
+        with self.assertRaises(yarnutils.AssertError):
+            yarnutils.assertNotEqual(0, 0)
+
+    def test_gt_works(self):
+        yarnutils.assertGreaterThan(1, 0)
+        with self.assertRaises(yarnutils.AssertError):
+            yarnutils.assertGreaterThan(0, 1)
+
+    def test_lt_works(self):
+        yarnutils.assertLessThan(0, 1)
+        with self.assertRaises(yarnutils.AssertError):
+            yarnutils.assertLessThan(1, 0)
+
+    def test_in_works(self):
+        yarnutils.assertIn(0, [0])
+        with self.assertRaises(yarnutils.AssertError):
+            yarnutils.assertIn(0, [])
+            yarnutils.assertIn(0, [1, 2, 3])
-- 
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