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using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;
namespace Xamarin.Forms.Core.UnitTests
{
[TestFixture]
public class StepperUnitTests : BaseTestFixture
{
[Test]
public void TestConstructor ()
{
var stepper = new Stepper (120, 200, 150, 2);
Assert.AreEqual (120, stepper.Minimum);
Assert.AreEqual (200, stepper.Maximum);
Assert.AreEqual (150, stepper.Value);
Assert.AreEqual (2, stepper.Increment);
}
[Test]
public void TestInvalidConstructor ()
{
Assert.Throws<ArgumentOutOfRangeException>(()=>new Stepper (100, 0, 50, 1));
}
[Test]
public void TestInvalidMaxValue ()
{
Stepper stepper = new Stepper ();
Assert.Throws<ArgumentException> (() => stepper.Maximum = stepper.Minimum - 1);
}
[Test]
public void TestInvalidMinValue ()
{
Stepper stepper = new Stepper ();
Assert.Throws<ArgumentException> (() => stepper.Minimum = stepper.Maximum + 1);
}
[Test]
public void TestValidMaxValue ()
{
Stepper stepper = new Stepper ();
stepper.Maximum = 2000;
Assert.AreEqual (2000, stepper.Maximum);
}
[Test]
public void TestValidMinValue ()
{
Stepper stepper = new Stepper ();
stepper.Maximum = 2000;
stepper.Minimum = 200;
Assert.AreEqual (200, stepper.Minimum);
}
[Test]
public void TestConstructorClampValue ()
{
Stepper stepper = new Stepper (0, 100, 2000, 1);
Assert.AreEqual (100, stepper.Value);
stepper = new Stepper (0, 100, -200, 1);
Assert.AreEqual (0, stepper.Value);
}
[Test]
public void TestMinClampValue ()
{
Stepper stepper = new Stepper ();
bool minThrown = false;
bool valThrown = false;
stepper.PropertyChanged += (sender, e) => {
switch (e.PropertyName) {
case "Minimum":
minThrown = true;
break;
case "Value":
Assert.False (minThrown);
valThrown = true;
break;
}
};
stepper.Minimum = 10;
Assert.AreEqual (10, stepper.Minimum);
Assert.AreEqual (10, stepper.Value);
Assert.True (minThrown);
Assert.True (valThrown);
}
[Test]
public void TestMaxClampValue ()
{
Stepper stepper = new Stepper ();
stepper.Value = 50;
bool maxThrown = false;
bool valThrown = false;
stepper.PropertyChanged += (sender, e) => {
switch (e.PropertyName) {
case "Maximum":
maxThrown = true;
break;
case "Value":
Assert.False (maxThrown);
valThrown = true;
break;
}
};
stepper.Maximum = 25;
Assert.AreEqual (25, stepper.Maximum);
Assert.AreEqual (25, stepper.Value);
Assert.True (maxThrown);
Assert.True (valThrown);
}
[Test]
public void TestValueChangedEvent ()
{
var stepper = new Stepper ();
bool fired = false;
stepper.ValueChanged += (sender, arg) => fired = true;
stepper.Value = 50;
Assert.True (fired);
}
[TestCase (100.0, 0.5)]
[TestCase (10.0, 25.0)]
[TestCase (0, 39.5)]
public void StepperValueChangedEventArgs (double initialValue, double finalValue)
{
var stepper = new Stepper {
Maximum = 100,
Minimum = 0,
Increment = 0.5,
Value = initialValue
};
Stepper stepperFromSender = null;
var oldValue = 0.0;
var newValue = 0.0;
stepper.ValueChanged += (s, e) => {
stepperFromSender = (Stepper)s;
oldValue = e.OldValue;
newValue = e.NewValue;
};
stepper.Value = finalValue;
Assert.AreEqual (stepper, stepperFromSender);
Assert.AreEqual (initialValue, oldValue);
Assert.AreEqual (finalValue, newValue);
}
}
}
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