JSpecify: add existing jspecify tests

compiler/testData/foreignAnnotationsJava8/tests/jspecify/java/IntersectionToObject.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2020 The JSpecify Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import org.jspecify.annotations.DefaultNonNull;
+import org.jspecify.annotations.Nullable;
+import org.jspecify.annotations.NullnessUnspecified;
+
+@DefaultNonNull
+class IntersectionToObject {
+  Object x0(ImplicitlyObjectBounded<? extends Lib> x) {
+    return x.get();
+  }
+
+  Object x1(ImplicitlyObjectBounded<? extends @NullnessUnspecified Lib> x) {
+    return x.get();
+  }
+
+  Object x2(ImplicitlyObjectBounded<? extends @Nullable Lib> x) {
+    return x.get();
+  }
+
+  Object x3(ExplicitlyObjectBounded<? extends Lib> x) {
+    return x.get();
+  }
+
+  Object x4(ExplicitlyObjectBounded<? extends @NullnessUnspecified Lib> x) {
+    return x.get();
+  }
+
+  Object x5(ExplicitlyObjectBounded<? extends @Nullable Lib> x) {
+    return x.get();
+  }
+
+  Object x6(UnspecBounded<? extends Lib> x) {
+    return x.get();
+  }
+
+  Object x7(UnspecBounded<? extends @NullnessUnspecified Lib> x) {
+    // jspecify_nullness_not_enough_information
+    return x.get();
+  }
+
+  Object x8(UnspecBounded<? extends @Nullable Lib> x) {
+    // jspecify_nullness_not_enough_information
+    return x.get();
+  }
+
+  Object x9(NullableBounded<? extends Lib> x) {
+    return x.get();
+  }
+
+  Object x10(NullableBounded<? extends @NullnessUnspecified Lib> x) {
+    // jspecify_nullness_not_enough_information
+    return x.get();
+  }
+
+  Object x11(NullableBounded<? extends @Nullable Lib> x) {
+    // jspecify_nullness_mismatch
+    return x.get();
+  }
+
+  interface ImplicitlyObjectBounded<T> {
+    T get();
+  }
+
+  interface ExplicitlyObjectBounded<T extends Object> {
+    T get();
+  }
+
+  interface UnspecBounded<T extends @NullnessUnspecified Object> {
+    T get();
+  }
+
+  interface NullableBounded<T extends @Nullable Object> {
+    T get();
+  }
+
+  interface Lib {}
+}