I'm testing a Flow with TestSource and TestSink
"TestSource/TestSink Example" should {
"work" in {
val (pub, sub) = TestSource.probe[MyClass]
.via(myFlow[String])
.toMat(TestSink.probe[String])(Keep.both)
.run()
sub.request(1)
pub.sendNext(myData)
val response = sub.expectNext()
pub.sendComplete()
sub.expectComplete()
response.size shouldBe 1
}
}
I want to also test it with a real Source. The reference doc has this
example.
val sourceUnderTest = Source(1 to 4).filter(_ % 2 == 0).map(_ * 2)
sourceUnderTest
.runWith(TestSink.probe[Int])
.request(2)
.expectNext(4, 8)
.expectComplete()
If I change the first line from
val sourceUnderTest = Source(1 to 4).filter(_ % 2 == 0).map(_ * 2)
to
val sourceUnderTest = Source(1 to 4)
The test times out. Why do I need filter or map for the test to run?
What I want to do is replace TestSource with a real Source. I expected to
drop references to "pub" and have just the TestSink subscriber using
(Keep.right)
and then do assertions on the response. But this doesn't work.
val sourceUnderTest = Source.fromGraph(sourceGraph)
"Source/TestSink Example" should {
"work" in {
val sub = sourceUnderTest
.via(myFlow[String])
.toMat(TestSink.probe[String])(Keep.right)
.run()
sub.request(1)
val response = sub.expectNext()
response.size shouldBe 1
}
}
How do I use the nice TestSource/TestSink format with a real Source?
Gary
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