Add support for UniqueId selectors, post merge fixes

Author: alextu

src/main/java/co/helmethair/scalatest/ScalatestEngine.java

@@ -13,7 +13,6 @@
 import org.junit.platform.engine.discovery.ClassSelector;
 import org.junit.platform.engine.discovery.UniqueIdSelector;
 
-import java.util.List;
 import java.util.Optional;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -37,8 +36,8 @@ public TestDescriptor discover(EngineDiscoveryRequest discoveryRequest, UniqueId
 
         return runtime.discover(engineDescriptor,
             Stream.concat(
-                discoverClassSelectors(discoveryRequest).stream(),
-                discoverUniqueIdSelectors(discoveryRequest).stream()
+                discoverClassSelectors(discoveryRequest),
+                discoverUniqueIdSelectors(discoveryRequest)
             ).collect(Collectors.toSet()),
             Thread.currentThread().getContextClassLoader());
     }
@@ -55,17 +54,16 @@ public void execute(ExecutionRequest executionRequest) {
         executor.executeTest(executionRequest.getRootTestDescriptor(), reporter);
     }
 
-    private List<String> discoverUniqueIdSelectors(EngineDiscoveryRequest discoveryRequest) {
+    private Stream<String> discoverUniqueIdSelectors(EngineDiscoveryRequest discoveryRequest) {
         return discoveryRequest.getSelectorsByType(UniqueIdSelector.class).stream()
             .map(this::getSuite)
             .filter(Optional::isPresent)
-            .map(Optional::get)
-            .collect(Collectors.toList());
+            .map(Optional::get);
     }
 
     private Optional<String> getSuite(UniqueIdSelector u) {
         UniqueId uniqueId = u.getUniqueId();
-        if (uniqueId.hasPrefix(UniqueId.forEngine(ID))) {
+        if (uniqueId.hasPrefix(UniqueId.forEngine(ID)) && uniqueId.getSegments().size() > 1) {
             UniqueId.Segment segment = uniqueId.getSegments().get(1);
             if (SUITE_TYPE.equals(segment.getType())) {
                 return Optional.of(segment.getValue());
@@ -74,9 +72,8 @@ private Optional<String> getSuite(UniqueIdSelector u) {
         return Optional.empty();
     }
 
-    private List<String> discoverClassSelectors(EngineDiscoveryRequest discoveryRequest) {
+    private Stream<String> discoverClassSelectors(EngineDiscoveryRequest discoveryRequest) {
         return discoveryRequest.getSelectorsByType(ClassSelector.class).stream()
-            .map(ClassSelector::getClassName)
-            .collect(Collectors.toList());
+            .map(ClassSelector::getClassName);
     }
 }

src/test/java/co/helmethair/scalatest/UniqueIdTest.java

@@ -9,7 +9,9 @@
 public class UniqueIdTest implements TestHelpers {
 
     @ParameterizedTest
-    @CsvSource({"[engine:scalatest]/[suite:tests.NestedTest], 2, 0",
+    @CsvSource({
+        "[engine:scalatest], 0, 0",
+        "[engine:scalatest]/[suite:tests.NestedTest], 2, 0",
         // For now, it does not support really executing the selected test, it will execute the whole suite
         "[engine:scalatest]/[suite:tests.NestedTest]/[test:nested test1], 2, 0",
         "[engine:scalatest]/[foo:tests.NestedTest], 0, 0",