diff --git a/tests.py b/tests.py
index cd64084..d413bb1 100644
--- a/tests.py
+++ b/tests.py
@@ -10,6 +10,97 @@ import sudoku
 import unittest
 
 
+def test_9x9_dimensions():
+    '''
+    Test dimenions of a 9x9 Sudoku board.
+    '''
+    b = sudoku.Board()
+    assert len(b.keys()) == 81
+    assert b.size == 9
+    assert b.box_size == 3
+    for square, values in b.items():
+        assert len(values) == 9
+
+
+def test_9x9_units():
+    '''
+    Test units of a 9x9 Sudoku board.
+    '''
+    b = sudoku.Board()
+    for r in range(b.size):
+        row = b.row(r)
+        assert len(row) == 9
+        for sq in row:
+            assert sq[1] == r
+
+    for c in range(b.size):
+        col = b.col(c)
+        assert len(col) == 9
+        for sq in col:
+            assert sq[0] == c
+
+    for x in range(0, b.size, b.box_size):
+        for y in range(0, b.size, b.box_size):
+            box = b.box(x, y)
+            assert len(box) == 9
+            # TODO: Finish this test
+
+def test_9x9_row():
+    '''
+    A few tests on rows of a 9x9 Sudoku board.
+    '''
+    b = sudoku.Board()
+    row = b.row(1)
+    expected_keys = ((x, 1) for x in range(b.size))
+    for ekey in expected_keys:
+    	assert ekey in row
+    # No negative numbers
+    assert (-1, 1) not in row
+    # Only squares with the right y-coordinate
+    assert (0, 0) not in row
+    # No keys above the size of the board
+    assert (b.size, 1) not in row
+
+
+def test_9x9_col():
+    '''
+    A few tests on rows of a 9x9 Sudoku board.
+    '''
+    b = sudoku.Board()
+    col = b.col(3)
+    expected_keys = ((3, y) for y in range(b.size))
+    for ekey in expected_keys:
+    	assert ekey in col
+    # No negative numbers
+    assert (3, -1) not in col
+    # Only squares with the right x-coordinate
+    assert (0, 0) not in col
+    # No keys above the size of the board
+    assert (3, b.size) not in col
+
+
+def test_9x9_box():
+    '''
+    A few tests on boxes of a 9x9 Sudoku board.
+    '''
+    b = sudoku.Board()
+    assert True
+
+
+def test_9x9_peers():
+    '''
+    Test peers.
+    '''
+    b = sudoku.Board()
+    peers = b.peers(3, 3)
+    expected_peers = set(  [(x, 3) for x in range(b.size)]
+                         + [(3, y) for y in range(b.size)]
+                         + [(3, 3), (3, 4), (3, 5), (4, 3), (4, 4), (4, 5), (5, 3), (5, 4), (5, 5)])
+    expected_peers.remove((3, 3))
+    for epeer in expected_peers:
+    	assert epeer in peers, '{} not in peers of (3, 3)'.format(epeer)
+
+
 def main():
     nose.main()