fix: change error raised by badly formed input for numpy.add operator in literals tests

Author: sbillinge

src/diffpy/srfit/equation/literals/operators.py

@@ -41,7 +41,7 @@ class Operator(Literal, OperatorABC):
     """Abstract class for specifying a general operator.
 
     This class provides several methods that are common to a derived
-    classes for concrete concrete operations.
+    classes for concrete operations.
 
     Class Attributes
     ----------------

tests/test_literals.py

@@ -118,7 +118,7 @@ def testAddLiteral(self):
         """Test adding a literal to an operator node."""
         op = self.op
 
-        self.assertRaises(ValueError, op.getValue)
+        self.assertRaises(TypeError, op.getValue)
         op._value = 1
         self.assertEqual(op.getValue(), 1)
 
@@ -127,7 +127,7 @@ def testAddLiteral(self):
         b = literals.Argument(name = "b", value = 0)
 
         op.addLiteral(a)
-        self.assertRaises(ValueError, op.getValue)
+        self.assertRaises(TypeError, op.getValue)
 
         op.addLiteral(b)
         self.assertAlmostEqual(0, op.value)

tests/test_visitors.py

@@ -194,7 +194,7 @@ def testSimpleFunction(self):
         self.assertTrue(plus2.hasObserver(mult._flush))
 
         # plus2 has no arguments yet. Verify this.
-        self.assertRaises(ValueError, mult.getValue)
+        self.assertRaises(TypeError, mult.getValue)
         # Add the arguments to plus2.
         plus2.addLiteral(v4)
         plus2.addLiteral(v5)