public void GetHashCode_WithEqualObject_EqualHashes(string code)
        {
            var x = new EGPostalCode(code);
            var y = new EGPostalCode(code);

            Assert.IsTrue(x.GetHashCode() == y.GetHashCode());
        }
 public void Predecessor_ValidInput_ReturnsCorrectPostalCode(string postalCode, string postalCodePredecessor)
 {
     var code = new EGPostalCode(postalCode);
     var codePredecessor = new EGPostalCode(postalCodePredecessor);
     Assert.AreEqual(codePredecessor, code.Predecessor);
     Assert.AreEqual(codePredecessor.ToString(), code.Predecessor.ToString());
     Assert.AreEqual(codePredecessor.ToHumanReadableString(), code.Predecessor.ToHumanReadableString());
 }
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        public void CompareTo_ReturnsExpectedSign(string postalCodeBefore, string postalCodeAfter)
        {
            var b = new EGPostalCode(postalCodeBefore);
            var a = new EGPostalCode(postalCodeAfter);

            Assert.AreEqual(Math.Sign(-1), Math.Sign(b.CompareTo(a)));
            Assert.AreEqual(Math.Sign(1), Math.Sign(a.CompareTo(b)));
        }
 public void AreAdjacent_WithAdjacentPostalCodes_ReturnsTrue(string code)
 {
     var x = new EGPostalCode(code);
     var xPred = x.Predecessor;
     var xSucc = x.Successor;
     Assert.IsTrue(PostalCode.AreAdjacent(x, xPred));
     Assert.IsTrue(PostalCode.AreAdjacent(xPred, x));
     Assert.IsTrue(PostalCode.AreAdjacent(x, xSucc));
     Assert.IsTrue(PostalCode.AreAdjacent(xSucc, x));
     Assert.IsFalse(PostalCode.AreAdjacent(xPred, xSucc));
 }             
 public void GetHashCode_WithEqualObject_EqualHashes(string code)
 {
     var x = new EGPostalCode(code);
     var y = new EGPostalCode(code);
     Assert.IsTrue(x.GetHashCode() == y.GetHashCode());
 }