public void NavigatingForward_InvokesChangeEvent()
{
// arrange
var nav = new NavigationHistory <int>();
var eventCount = 0;
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
nav.OnHistoryChange += () =>
{
eventCount++;
};
// act
nav.NavigateForward();
// assert
Assert.AreEqual(1, eventCount);
}
public void ReadOnlyMode_BlocksForwardNavigation()
{
// arrange
var nav = new NavigationHistory <int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
nav.IsReadOnly = true;
// act
nav.NavigateForward();
nav.NavigateForward();
nav.NavigateForward();
var canStillNavigate = nav.CanNavigateForward;
nav.IsReadOnly = false;
var two = nav.NavigateForward();
// assert
Assert.True(canStillNavigate);
Assert.AreEqual(2, two);
}
public void After_MultipleHistoryItems_CanNavigateBackward()
{
// arrange
var nav = new NavigationHistory <int>();
// act
nav.AddToHistory(1);
nav.AddToHistory(2);
// assert
Assert.IsTrue(nav.CanNavigateBackward);
}
public void While_AtHeadOfHistory_CannotNavigateForward()
{
// arrange
var nav = new NavigationHistory <int>();
// act
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
// assert
Assert.IsFalse(nav.CanNavigateForward);
}
public void After_NavigatingBackward_CanNavigateForward()
{
// arrange
var nav = new NavigationHistory <int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
// act
nav.NavigateBackward();
// assert
Assert.IsTrue(nav.CanNavigateForward);
}
public void BackwardsNavigation_DuringReadOnlyMode_ProducesDefaultValue()
{
// arrange
var nav = new NavigationHistory <int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.IsReadOnly = true;
// act
var zero = nav.NavigateBackward();
// assert
Assert.AreEqual(default(int), zero);
}
public void NavigatingBackward_ProducesCorrectItem()
{
// arrange
var nav = new NavigationHistory <int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
// act
var two = nav.NavigateBackward();
var one = nav.NavigateBackward();
// assert
Assert.AreEqual(2, two);
Assert.AreEqual(1, one);
}
public void After_AddingHistory_CannotNavigateForward()
{
// arrange
var nav = new NavigationHistory<int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
// act
nav.AddToHistory(9);
// assert
Assert.IsFalse(nav.CanNavigateForward);
}
public void After_AddingHistory_CannotNavigateForward()
{
// arrange
var nav = new NavigationHistory <int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
// act
nav.AddToHistory(9);
// assert
Assert.IsFalse(nav.CanNavigateForward);
}
public void ReadOnlyMode_BlocksAddingToHistory()
{
// arrange
var nav = new NavigationHistory <int>();
nav.IsReadOnly = true;
// act
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.IsReadOnly = false;
// assert
Assert.IsFalse(nav.CanNavigateBackward);
Assert.IsFalse(nav.CanNavigateForward);
}
public void After_AddingHistory_ForwardHistoryIsDestroyed()
{
// arrange
var nav = new NavigationHistory<int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.AddToHistory(4);
nav.AddToHistory(5);
nav.NavigateBackward();
nav.NavigateBackward();
nav.NavigateBackward();
nav.NavigateBackward();
// act
nav.AddToHistory(9);
var one = nav.NavigateBackward();
var navBackAfterOne = nav.CanNavigateBackward;
var nine = nav.NavigateForward();
var navForwAfterNine = nav.CanNavigateForward;
// assert
Assert.IsFalse(navBackAfterOne);
Assert.IsFalse(navForwAfterNine);
Assert.AreEqual(1, one);
Assert.AreEqual(9, nine);
}
public void After_AddingHistory_ForwardHistoryIsDestroyed()
{
// arrange
var nav = new NavigationHistory <int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.AddToHistory(4);
nav.AddToHistory(5);
nav.NavigateBackward();
nav.NavigateBackward();
nav.NavigateBackward();
nav.NavigateBackward();
// act
nav.AddToHistory(9);
var one = nav.NavigateBackward();
var navBackAfterOne = nav.CanNavigateBackward;
var nine = nav.NavigateForward();
var navForwAfterNine = nav.CanNavigateForward;
// assert
Assert.IsFalse(navBackAfterOne);
Assert.IsFalse(navForwAfterNine);
Assert.AreEqual(1, one);
Assert.AreEqual(9, nine);
}
public void After_SingleHistoryItem_CannotNavigate()
{
// arrange
var nav = new NavigationHistory <int>();
// act
nav.AddToHistory(42);
// assert
Assert.IsFalse(nav.CanNavigateBackward);
Assert.IsFalse(nav.CanNavigateForward);
}
public void AddingToHistory_InvokesChangeEvent()
{
// arrange
var nav = new NavigationHistory <int>();
var eventCount = 0;
nav.OnHistoryChange += () =>
{
eventCount++;
};
// act
nav.AddToHistory(1);
// assert
Assert.AreEqual(1, eventCount);
}
public void AddingToHistory_InvokesChangeEvent()
{
// arrange
var nav = new NavigationHistory<int>();
var eventCount = 0;
nav.OnHistoryChange += () =>
{
eventCount++;
};
// act
nav.AddToHistory(1);
// assert
Assert.AreEqual(1, eventCount);
}
public void ForwardsNavigation_DuringReadOnlyMode_ProducesDefaultValue()
{
// arrange
var nav = new NavigationHistory<int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
nav.IsReadOnly = true;
// act
var zero = nav.NavigateForward();
// assert
Assert.AreEqual(default(int), zero);
}
public void ReadOnlyMode_BlocksForwardNavigation()
{
// arrange
var nav = new NavigationHistory<int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
nav.IsReadOnly = true;
// act
nav.NavigateForward();
nav.NavigateForward();
nav.NavigateForward();
var canStillNavigate = nav.CanNavigateForward;
nav.IsReadOnly = false;
var two = nav.NavigateForward();
// assert
Assert.True(canStillNavigate);
Assert.AreEqual(2, two);
}
public void NavigatingForward_InvokesChangeEvent()
{
// arrange
var nav = new NavigationHistory<int>();
var eventCount = 0;
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
nav.OnHistoryChange += () =>
{
eventCount++;
};
// act
nav.NavigateForward();
// assert
Assert.AreEqual(1, eventCount);
}
public void ReadOnlyMode_BlocksAddingToHistory()
{
// arrange
var nav = new NavigationHistory<int>();
nav.IsReadOnly = true;
// act
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.IsReadOnly = false;
// assert
Assert.IsFalse(nav.CanNavigateBackward);
Assert.IsFalse(nav.CanNavigateForward);
}
public void After_SingleHistoryItem_CannotNavigate()
{
// arrange
var nav = new NavigationHistory<int>();
// act
nav.AddToHistory(42);
// assert
Assert.IsFalse(nav.CanNavigateBackward);
Assert.IsFalse(nav.CanNavigateForward);
}
public void After_MultipleHistoryItems_CanNavigateBackward()
{
// arrange
var nav = new NavigationHistory<int>();
// act
nav.AddToHistory(1);
nav.AddToHistory(2);
// assert
Assert.IsTrue(nav.CanNavigateBackward);
}
public void While_AtHeadOfHistory_CannotNavigateForward()
{
// arrange
var nav = new NavigationHistory<int>();
// act
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
// assert
Assert.IsFalse(nav.CanNavigateForward);
}
public void After_NavigatingBackward_CanNavigateForward()
{
// arrange
var nav = new NavigationHistory<int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
// act
nav.NavigateBackward();
// assert
Assert.IsTrue(nav.CanNavigateForward);
}
public void NavigatingForward_ProducesCorrectItem()
{
// arrange
var nav = new NavigationHistory<int>();
nav.AddToHistory(1);
nav.AddToHistory(2);
nav.AddToHistory(3);
nav.NavigateBackward();
nav.NavigateBackward();
// act
var two = nav.NavigateForward();
var three = nav.NavigateForward();
// assert
Assert.AreEqual(2, two);
Assert.AreEqual(3, three);
}
