Merge pull request #140 from gabrielfalcao/issue/139

Remove wrong parens for format call. Closes #139.

sure/core.py

@@ -100,7 +100,7 @@ def compare_floats(self, X, Y):
             return True
         else:
             m = 'X{0}±{1} != Y{2}±{3}'.format(
-                (red(c.current_X_keys), self.epsilon, green(c.current_Y_keys), self.epsilon))
+                red(c.current_X_keys), self.epsilon, green(c.current_Y_keys), self.epsilon)
             return DeepExplanation(m)
 
     def compare_dicts(self, X, Y):

tests/issues/test_issue_139.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+
+"""
+Test fix of bug described in GitHub Issue #139.
+"""
+
+from sure import expect
+
+
+def test_issue_139():
+    "Test for GitHub Issue #139"
+    # test with big epsilon
+    expect(1.).should.equal(5., 4.)
+
+    # shouldn't raise IndexError: tuple index out of range
+    try:
+        expect(1.).should.equal(5., 3.)
+    except AssertionError:
+        pass
+    else:
+        raise RuntimeError('should not be equal')