public void GetPropertyName_Exception_LambdaExpressionIsNotMemberAccess()
{
var e = Assert.Throws <ArgumentException>(() => TestableNotifyPropertyChanged.GetPropertyName(o => 42));
Assert.Equal("The argument must be a member access lambda expression.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void GetPropertyName_Exception_LambdaExpressionIsNull()
{
var e = Assert.Throws <ArgumentNullException>(() => TestableNotifyPropertyChanged.GetPropertyName(null));
Assert.Equal("Value cannot be null.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void SetProperty_SetsProperty_Object()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
object value = new object();
obj.SetProperty_MyObjectProperty(value, "MyObjectProperty");
Assert.Equal(value, obj.MyObjectProperty);
}
public void SetProperty_Exception_LambdaExpression_IsNotMemberAccess()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
var e = Assert.Throws <ArgumentException>(() => obj.SetProperty_MySetProperty(10, () => 42));
Assert.Equal("The argument must be a member access lambda expression.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void OnPropertyChanged_Exception_LambdaExpression_ExpressionIsNull()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
var e = Assert.Throws <ArgumentNullException>(() => obj.FirePropertyChangedWithLambda <int>(null));
Assert.Equal("Value cannot be null.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void SetProperty_Exception_LambdaExpression_ExpressionIsNull()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
Expression <Func <int> > propertyExpression = null;
var e = Assert.Throws <ArgumentNullException>(() => obj.SetProperty_MySetProperty(10, propertyExpression));
Assert.Equal("Value cannot be null.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void SetProperty_SetsProperty_Struct()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged()
{
MySetProperty = 5
};
obj.SetProperty_MySetProperty(10, "MySetProperty");
Assert.Equal(10, obj.MySetProperty);
}
public void SetProperty_ReturnsTrue_IfValueHasNotChanged()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged()
{
MySetProperty = 10
};
bool changed = obj.SetProperty_MySetProperty(10, "MySetProperty");
Assert.Equal(false, changed);
}
public void OnPropertyChanged_FiresPropertyChangedEvent_LambdaExpression()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MyProperty", e.PropertyName);
propertyChangedCount++;
};
obj.FirePropertyChangedWithLambda(() => obj.MyProperty);
Assert.Equal(1, propertyChangedCount);
}
public void OnPropertyChanged_FiresPropertyChangedEvent_PropertyChangedEventArgs()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MyProperty", e.PropertyName);
propertyChangedCount++;
};
obj.FirePropertyChangedWithEventArgs(new PropertyChangedEventArgs("MyProperty"));
Assert.Equal(1, propertyChangedCount);
}
public void SetProperty_FiresPropertyChangedEvent_String()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MySetProperty", e.PropertyName);
propertyChangedCount++;
};
obj.SetProperty_MySetProperty(42, "MySetProperty");
Assert.Equal(1, propertyChangedCount);
}
public void SetProperty_DoesNotFireEventIfNotChanged_Struct()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged()
{
MySetProperty = 10
};
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MySetProperty", e.PropertyName);
propertyChangedCount++;
};
obj.MySetProperty = 10;
Assert.Equal(0, propertyChangedCount);
}
public void SetProperty_FiresPropertyChangedEvent_Void_Object_ToNull()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged()
{
MyObjectProperty = new object()
};
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MyObjectProperty", e.PropertyName);
propertyChangedCount++;
};
obj.MyObjectProperty = null;
Assert.Equal(1, propertyChangedCount);
}
public void SetProperty_DoesNotFireEventIfNotChanged_ObjectNull()
{
object value = new object();
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged()
{
MyObjectProperty = null
};
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MyObjectProperty", e.PropertyName);
propertyChangedCount++;
};
obj.MyObjectProperty = null;
Assert.Equal(0, propertyChangedCount);
}
public void OnPropertyChanged_IgnoresIfNoEventHandlerAttached()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
obj.FirePropertyChangedWithEventArgs(new PropertyChangedEventArgs("MyProperty"));
}
public void GetPropertyName_ReturnsNameOfProperty()
{
string propertyName = TestableNotifyPropertyChanged.GetPropertyName(o => o.MyProperty);
Assert.Equal("MyProperty", propertyName);
}
