public async Task Performance(IDigraphsLookup implementation)
{
const int warmups = 1000;
const int runs = 1000;
var digraphs = new[] { "ab", "ad", "af", "ag", "ar" };
var bookPath = GetBookPath("Frankenstein");
using (var stream = new MemoryStream(await File.ReadAllBytesAsync(bookPath)))
{
// Health Check
LookupResult[] result;
using (var copy = new MemoryStream(stream.ToArray()))
{
result = await implementation.LookupAsync(copy, digraphs);
}
CollectionAssert.AreEquivalent(new[]
{
new LookupResult("ab", 668),
new LookupResult("ad", 1282),
new LookupResult("af", 246),
new LookupResult("ag", 659),
new LookupResult("ar", 2593)
}, result);
// Warmup
for (var i = 0; i < warmups; i++)
{
using (var copy = new MemoryStream(stream.ToArray()))
{
await implementation.LookupAsync(copy, digraphs);
}
}
// Run
var watch = new Stopwatch();
var times = new long[runs];
for (var i = 0; i < runs; i++)
{
using (var copy = new MemoryStream(stream.ToArray()))
{
GC.Collect();
watch.Restart();
await implementation.LookupAsync(copy, digraphs);
watch.Stop();
}
times[i] = watch.ElapsedMilliseconds;
}
WriteTimings(implementation.GetType().Name, times);
}
}
public async Task FindOneDigraph(IDigraphsLookup implementation)
{
LookupResult[] result;
using (var stream = GivenStream("ab"))
{
result = await implementation.LookupAsync(stream, "ab");
}
CollectionAssert.AreEquivalent(new[]
{
new LookupResult("ab", 1)
}, result);
}
public async Task EmptyTextAlwaysReturnZeroes(IDigraphsLookup implementation)
{
LookupResult[] result;
using (var stream = GivenStream(""))
{
result = await implementation.LookupAsync(stream, "ab", "ad", "af");
}
CollectionAssert.AreEquivalent(new[]
{
new LookupResult("ab", 0),
new LookupResult("ad", 0),
new LookupResult("af", 0)
}, result);
}