diff --git a/tests/test_csp.py b/tests/test_csp.py
index 803dede74..301fd643d 100644
--- a/tests/test_csp.py
+++ b/tests/test_csp.py
@@ -254,6 +254,70 @@ def test_mrv():
assert mrv(assignment, csp) == 'C'
+def test_unordered_domain_values():
+ map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
+ assignment = None
+ assert unordered_domain_values('A', assignment, map_coloring_test) == ['1', '2', '3']
+
+
+def test_lcv():
+ neighbors = parse_neighbors('A: B; B: C; C: ')
+ domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 5], 'C': [0, 1, 2, 3, 4]}
+ constraints = lambda X, x, Y, y: x % 2 == 0 and (x+y) == 4
+ csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
+ assignment = {'A': 0}
+
+ var = 'B'
+
+ assert lcv(var, assignment, csp) == [4, 0, 1, 2, 3, 5]
+ assignment = {'A': 1, 'C': 3}
+
+ constraints = lambda X, x, Y, y: (x + y) % 2 == 0 and (x + y) < 5
+ csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
+
+ assert lcv(var, assignment, csp) == [1, 3, 0, 2, 4, 5]
+
+
+def test_forward_checking():
+ neighbors = parse_neighbors('A: B; B: C; C: ')
+ domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 5], 'C': [0, 1, 2, 3, 4]}
+ constraints = lambda X, x, Y, y: (x + y) % 2 == 0 and (x + y) < 8
+ csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
+
+ csp.support_pruning()
+ A_curr_domains = csp.curr_domains['A']
+ C_curr_domains = csp.curr_domains['C']
+
+ var = 'B'
+ value = 3
+ assignment = {'A': 1, 'C': '3'}
+ assert forward_checking(csp, var, value, assignment, None) == True
+ assert csp.curr_domains['A'] == A_curr_domains
+ assert csp.curr_domains['C'] == C_curr_domains
+
+ assignment = {'C': 3}
+
+ assert forward_checking(csp, var, value, assignment, None) == True
+ assert csp.curr_domains['A'] == [1, 3]
+
+ csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
+ csp.support_pruning()
+
+ assignment = {}
+ assert forward_checking(csp, var, value, assignment, None) == True
+ assert csp.curr_domains['A'] == [1, 3]
+ assert csp.curr_domains['C'] == [1, 3]
+
+ csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
+ domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 7], 'C': [0, 1, 2, 3, 4]}
+ csp.support_pruning()
+
+ value = 7
+ assignment = {}
+ assert forward_checking(csp, var, value, assignment, None) == False
+ assert (csp.curr_domains['A'] == [] or csp.curr_domains['C'] == [])
+
+
def test_backtracking_search():
assert backtracking_search(australia)
assert backtracking_search(australia, select_unassigned_variable=mrv)
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