Use Java 17 ServiceLoader#stream in AbstractContainerGroupAssert

Author: ascopes

java-compiler-testing/src/main/java/io/github/ascopes/jct/assertions/AbstractContainerGroupAssert.java

@@ -19,8 +19,8 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import io.github.ascopes.jct.containers.ContainerGroup;
-import java.util.ArrayList;
 import java.util.List;
+import java.util.ServiceLoader;
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.AbstractListAssert;
 import org.assertj.core.api.ObjectAssert;
@@ -74,9 +74,9 @@ public LocationAssert location() {
     requireNonNull(type, "type must not be null");
     isNotNull();
 
-    var items = new ArrayList<T>();
-    actual.getServiceLoader(type).iterator().forEachRemaining(items::add);
-
+    var items = actual.getServiceLoader(type)
+        .stream()
+        .map(ServiceLoader.Provider::get);
     return assertThat(items);
   }
 }

java-compiler-testing/src/main/java/io/github/ascopes/jct/assertions/TraceDiagnosticListAssert.java

@@ -353,7 +353,8 @@ protected TraceDiagnosticListAssert newAbstractIterableAssert(
   }
 
   private Predicate<@Nullable TraceDiagnostic<? extends JavaFileObject>> kindIsOneOf(
-      Iterable<Kind> kinds) {
+      Iterable<Kind> kinds
+  ) {
     var kindsSet = new LinkedHashSet<Kind>();
     kinds.forEach(kindsSet::add);
 

java-compiler-testing/src/main/java/io/github/ascopes/jct/assertions/TypeAwareListAssert.java

@@ -56,10 +56,7 @@ protected A toAssert(@Nullable E value, String description) {
   protected TypeAwareListAssert<@Nullable E, A> newAbstractIterableAssert(
       Iterable<? extends @Nullable E> iterable
   ) {
-    var list = StreamSupport
-        .stream(iterable.spliterator(), false)
-        .toList();
-
+    var list = StreamSupport.stream(iterable.spliterator(), false).toList();
     return new TypeAwareListAssert<>(list, assertFactory);
   }
 }

java-compiler-testing/src/test/java/io/github/ascopes/jct/assertions/AbstractContainerGroupAssertTest.java

@@ -27,6 +27,7 @@
 import io.github.ascopes.jct.containers.ContainerGroup;
 import java.util.List;
 import java.util.ServiceLoader;
+import java.util.stream.Stream;
 import org.assertj.core.api.AbstractListAssert;
 import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.DisplayName;
@@ -117,7 +118,8 @@ void servicesReturnsListAssertionAcrossTheAvailableServices() {
       var impl3 = mock(SomeServiceType.class);
 
       ServiceLoader<SomeServiceType> serviceLoader = mock();
-      when(serviceLoader.iterator()).then(ctx -> List.of(impl1, impl2, impl3).iterator());
+      when(serviceLoader.stream()).then(ctx -> Stream.of(impl1, impl2, impl3)
+          .map(ServiceLoaderProvider::new));
 
       var containerGroup = mock(ContainerGroup.class);
       when(containerGroup.getServiceLoader(any())).then(ctx -> serviceLoader);
@@ -148,4 +150,22 @@ static final class AssertionImpl
       super(containerGroup, AssertionImpl.class);
     }
   }
+
+  static class ServiceLoaderProvider<T> implements ServiceLoader.Provider<T> {
+    private final T service;
+
+    ServiceLoaderProvider(T service) {
+      this.service = service;
+    }
+
+    @Override
+    public T get() {
+      return service;
+    }
+
+    @Override
+    public Class<? extends T> type() {
+      return (Class<T>) service.getClass();
+    }
+  }
 }