From aadaa02e9ea8442b6cf2c816c17ab3605838b2a4 Mon Sep 17 00:00:00 2001
From: Eevee <eevee@nyarumaa.(none)>
Date: Wed, 7 Jan 2009 09:54:16 -0500
Subject: [PATCH] Added a test for puzzles with diagonal constraints.

Created a TestCase subclass to use for tests, too.
---
 pseudoku/__init__.py                   | 22 +---------------------
 pseudoku/tests/__init__.py             | 21 +++++++++++++++++++++
 pseudoku/tests/constraints/__init__.py |  0
 pseudoku/tests/constraints/diagonal.py | 18 ++++++++++++++++++
 pseudoku/tests/integrity/simple.py     | 17 ++++-------------
 5 files changed, 44 insertions(+), 34 deletions(-)
 create mode 100644 pseudoku/tests/constraints/__init__.py
 create mode 100644 pseudoku/tests/constraints/diagonal.py

diff --git a/pseudoku/__init__.py b/pseudoku/__init__.py
index c7a803b..33fe0b5 100644
--- a/pseudoku/__init__.py
+++ b/pseudoku/__init__.py
@@ -3,24 +3,4 @@ from grid.constraints import Diagonal
 import render.text
 
 def main():
-    grid = Grid.from_string("""
-        3...2...7
-        ...3.1...
-        ..6...4..
-        89.....54
-        4...5...8
-        61.....32
-        ..8...2..
-        ...5.9...
-        1...6...9
-    """)
-
-    grid.add_constraint(Diagonal(grid, direction='down', offset=0))
-    grid.add_constraint(Diagonal(grid, direction='up', offset=0))
-
-    r = render.text.AsciiArtGridRenderer()
-    print r.render_grid(grid)
-
-    grid.solve()
-
-    print r.render_grid(grid)
+    print "I don't do anything any more!"
diff --git a/pseudoku/tests/__init__.py b/pseudoku/tests/__init__.py
index e69de29..3821889 100644
--- a/pseudoku/tests/__init__.py
+++ b/pseudoku/tests/__init__.py
@@ -0,0 +1,21 @@
+from unittest import TestCase
+
+from pseudoku.grid import Grid
+
+class SudokuTestCase(TestCase):
+    """TestCase subclass that provides some convenience methods for testing
+    sudoku puzzles.
+    """
+    
+    def assertSolvable(self, grid, msg=None):
+        """Asserts that the given puzzle, when run through Grid.solve(),
+        produces a filled grid.
+
+        grid may be either a Grid object or a string.
+        """
+
+        if type(grid) == str:
+            grid = Grid.from_string(grid)
+
+        grid.solve()
+        self.assertTrue(grid.filled, msg)
diff --git a/pseudoku/tests/constraints/__init__.py b/pseudoku/tests/constraints/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/pseudoku/tests/constraints/diagonal.py b/pseudoku/tests/constraints/diagonal.py
new file mode 100644
index 0000000..c118339
--- /dev/null
+++ b/pseudoku/tests/constraints/diagonal.py
@@ -0,0 +1,18 @@
+from pseudoku.grid import Grid
+from pseudoku.grid.constraints import Diagonal
+
+from pseudoku.tests import SudokuTestCase
+
+class DiagonalGridTestCase(SudokuTestCase):
+    """Tests that grids with extra non-standard constraints are solved."""
+
+
+    def test_main_diagonals(self):
+        grid = Grid.from_string("""
+            3...2...7 ...3.1...  ..6...4..
+            89.....54 4...5...8 61.....32
+            ..8...2..  ...5.9...  1...6...9
+        """)
+        grid.add_constraint(Diagonal(grid, direction='down', offset=0))
+        grid.add_constraint(Diagonal(grid, direction='up', offset=0))
+        self.assertSolvable(grid, "Main diagonals (Color Sudoku, page 8)")
diff --git a/pseudoku/tests/integrity/simple.py b/pseudoku/tests/integrity/simple.py
index 9558ba3..48cde80 100644
--- a/pseudoku/tests/integrity/simple.py
+++ b/pseudoku/tests/integrity/simple.py
@@ -1,23 +1,14 @@
-from unittest import TestCase
-
 from pseudoku.grid import Grid
 
-class SimpleGridTestCase(TestCase):
+from pseudoku.tests import SudokuTestCase
+
+class SimpleGridTestCase(SudokuTestCase):
     """Tests the solving integrity of some puzzles that can be solved using
     only elimination and uniqueness.
     """
 
-    def _test_single_puzzle(self, puzzle, msg=None):
-        """Solves a single puzzle and verifies that the result is, at least,
-        not incorrect.
-        """
-        
-        grid = Grid.from_string(puzzle)
-        grid.solve()
-        self.assertTrue(grid.filled, msg)
-
     def test_simple(self):
-        self._test_single_puzzle("""
+        self.assertSolvable("""
             ...69.... 9.5..876. ..4..1.2.
             6...5...3 38.....49 7...3...2
             .7.9..3.. .231..4.8 ....83...
-- 
2.7.4