public void TestEnumeratorFetchesCorrectBatchItemsInReverseOrder()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
qq => qq.OrderByDescending(q => q),
null,
5
);
Assert.AreEqual(0, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 21, 20, 19, 18, 17 }, en.Current);
Assert.AreEqual(1, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 16, 15, 14, 13, 12 }, en.Current);
Assert.AreEqual(2, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 11, 10, 9, 8, 7 }, en.Current);
Assert.AreEqual(3, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 6, 5, 4, 3, 2 }, en.Current);
Assert.AreEqual(4, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 1 }, en.Current);
Assert.AreEqual(5, en.BatchNumber);
Assert.False(en.MoveNext());
}
public static void EnumerateBatches <T>(this IEnumerable <T> enumerable, int batchSize, Action <IEnumerator <T> > batchAction)
{
if (enumerable is null)
{
throw new ArgumentNullException(nameof(enumerable));
}
if (batchSize <= 0)
{
throw new ArgumentException("Batch size should be greater zero.", nameof(batchSize));
}
if (batchAction is null)
{
throw new ArgumentNullException(nameof(batchAction));
}
using (var enumerator = enumerable.GetEnumerator())
{
while (enumerator.MoveNext())
{
using (var batchEnumerator = new BatchEnumerator <T>(enumerator, batchSize))
{
batchAction(batchEnumerator);
}
}
}
}
public void TestEnumeratorFetchesCorrectBatchItems()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null,
5
);
Assert.AreEqual(0, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 1, 2, 3, 4, 5 }, en.Current);
Assert.AreEqual(1, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 6, 7, 8, 9, 10 }, en.Current);
Assert.AreEqual(2, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 11, 12, 13, 14, 15 }, en.Current);
Assert.AreEqual(3, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 16, 17, 18, 19, 20 }, en.Current);
Assert.AreEqual(4, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(new[] { 21 }, en.Current);
Assert.AreEqual(5, en.BatchNumber);
Assert.False(en.MoveNext());
}
public void TestEnumeratorThrowsExceptionWithNullResponseArgument()
{
Assert.Throws <ArgumentNullException>(() => {
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
null,
null,
null
);
});
}
public void TestBatchSizeWithoutInitializationHasValueGreaterThan0()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null
);
Assert.AreEqual(10, en.BatchSize);
}
public void TestEnumeratorThrowsExceptionWithNullItems()
{
Assert.Throws <ArgumentNullException>(() => {
var en = new BatchEnumerator <int, int>(
null,
q => q,
null,
null,
5
);
});
}
public void TestBatchSizeWithInitializationHasCorrectValue()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null,
5
);
Assert.AreEqual(5, en.BatchSize);
}
public void TestSetPaddingWithNoIteration()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null,
5
);
en.Padding = 6;
Assert.AreEqual(6, en.Padding);
}
public void TestSetPaddingInsideIterationThrowsException()
{
Assert.Throws <ArgumentException>(() => {
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null,
5
);
en.MoveNext();
en.Padding = 6;
});
}
public void TestEnumeratorFiltersEnumeration()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
q => q < 4,
5
);
Assert.AreEqual(0, en.BatchNumber);
Assert.True(en.MoveNext());
Assert.AreEqual(3, en.Current.Count());
Assert.AreEqual(new[] { 1, 2, 3 }, en.Current);
Assert.False(en.MoveNext());
}
public void TestResetResetsPage()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null,
5
);
Assert.True(en.MoveNext());
Assert.True(en.MoveNext());
Assert.AreEqual(2, en.BatchNumber);
en.Reset();
Assert.AreEqual(0, en.BatchNumber);
}
public void TestBaseEnumeratorCurrentProperty()
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
null,
null,
5
);
var baseEnumerator = (IEnumerator)en;
baseEnumerator.MoveNext();
Assert.IsInstanceOf <IEnumerable <int> >(baseEnumerator.Current);
var value = (IEnumerable <int>)baseEnumerator.Current;
Assert.AreEqual(5, value.Count());
}
public void TestDispose(string propertyName)
{
var en = new BatchEnumerator <int, int>(
Items.AsQueryable(),
q => q,
qq => qq.OrderBy(q => q),
null,
5
);
en.Dispose();
var property = en.GetType().GetField(
propertyName,
BindingFlags.NonPublic | BindingFlags.Instance
);
var propertyValue = property.GetValue(en);
Assert.AreEqual(null, propertyValue);
}