Move backend tests into their projects

Instead of having a single project which tests all backends, each
backend now implements a http test trait along with a streaming test
trait if it supports streaming. The test http server has been moved into
its own project and is started automatically before running a backends
test. This allows each backend to be tested without the possibility of
dependency eviction from another backend or the test http server. It
also has the side effect of parallelizing the tests providing a speed
up when run with multiple cores.

2 files changed, 50 insertions, 2 deletions

diff --git a/project/PollingUtils.scala b/project/PollingUtils.scala
new file mode 100644
index 0000000..34b92ac
--- /dev/null
+++ b/project/PollingUtils.scala
@@ -0,0 +1,45 @@
+import java.io.FileNotFoundException
+import java.net.{ConnectException, URL}
+
+import scala.concurrent.TimeoutException
+import scala.concurrent.duration._
+
+object PollingUtils {
+
+  def waitUntilServerAvailable(url: URL): Unit = {
+    val connected = poll(5.seconds, 250.milliseconds)({
+      urlConnectionAvailable(url)
+    })
+    if (!connected) {
+      throw new TimeoutException(s"Failed to connect to $url")
+    }
+  }
+
+  def poll(timeout: FiniteDuration, interval: FiniteDuration)(poll: => Boolean): Boolean = {
+    val start = System.nanoTime()
+
+    def go(): Boolean = {
+      if (poll) {
+        true
+      } else if ((System.nanoTime() - start) > timeout.toNanos) {
+        false
+      } else {
+        Thread.sleep(interval.toMillis)
+        go()
+      }
+    }
+    go()
+  }
+
+  def urlConnectionAvailable(url: URL): Boolean = {
+    try {
+      url.openConnection()
+        .getInputStream
+        .close()
+      true
+    } catch {
+      case _: ConnectException => false
+      case _: FileNotFoundException => true // on 404
+    }
+  }
+}
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 1d83f24..b334460 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,4 +1,5 @@
-addSbtPlugin("com.lucidchart" % "sbt-scalafmt" % "1.15")
+// using '-coursier' because of https://github.com/lucidsoftware/neo-sbt-scalafmt/issues/64
+addSbtPlugin("com.lucidchart" % "sbt-scalafmt-coursier" % "1.15")
 
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "2.0")
 
@@ -6,4 +7,6 @@ addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.0")
 
 addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.7")
 
-addSbtPlugin("com.updateimpact" % "updateimpact-sbt-plugin" % "2.1.3")
\ No newline at end of file
+addSbtPlugin("com.updateimpact" % "updateimpact-sbt-plugin" % "2.1.3")
+
+addSbtPlugin("io.spray" % "sbt-revolver" % "0.9.1")