1 files changed, 153 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/android/desugar/DesugarObjectsRequireNonNullTest.java b/src/test/java/com/google/devtools/build/android/desugar/DesugarObjectsRequireNonNullTest.java
new file mode 100644
index 0000000000..6f3be3c0aa
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/android/desugar/DesugarObjectsRequireNonNullTest.java
@@ -0,0 +1,153 @@
+// Copyright 2016 The Bazel Authors. All rights reserved.
+//
+// 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.
+package com.google.devtools.build.android.desugar;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.fail;
+import static org.objectweb.asm.Opcodes.INVOKESTATIC;
+
+import com.google.devtools.build.android.desugar.testdata.ClassCallingRequireNonNull;
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+/**
+ * This test case tests the desugaring feature for Objects.requireNonNull. This feature replaces any
+ * call to this method with o.getClass() to check whether 'o' is null.
+ */
+@RunWith(JUnit4.class)
+public class DesugarObjectsRequireNonNullTest {
+
+  @Test
+  public void testClassCallingRequireNonNullHasNoReferenceToRequiresNonNull() {
+    try {
+      ClassReader reader = new ClassReader(ClassCallingRequireNonNull.class.getName());
+
+      AtomicInteger counterForSingleArgument = new AtomicInteger(0);
+      AtomicInteger counterForString = new AtomicInteger(0);
+      AtomicInteger counterForSupplier = new AtomicInteger(0);
+
+      reader.accept(
+          new ClassVisitor(Opcodes.ASM5) {
+            @Override
+            public MethodVisitor visitMethod(
+                int access, String name, String desc, String signature, String[] exceptions) {
+              return new MethodVisitor(api) {
+                @Override
+                public void visitMethodInsn(
+                    int opcode, String owner, String name, String desc, boolean itf) {
+                  if (opcode == INVOKESTATIC
+                      && owner.equals("java/util/Objects")
+                      && name.equals("requireNonNull")) {
+                    switch (desc) {
+                      case "(Ljava/lang/Object;)Ljava/lang/Object;":
+                        counterForSingleArgument.incrementAndGet();
+                        break;
+                      case "(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;":
+                        counterForString.incrementAndGet();
+                        break;
+                      case "(Ljava/lang/Object;Ljava/util/function/Supplier;)Ljava/lang/Object;":
+                        counterForSupplier.incrementAndGet();
+                        break;
+                      default:
+                        fail("Unknown overloaded requireNonNull is found: " + desc);
+                    }
+                  }
+                }
+              };
+            }
+          },
+          0);
+      assertThat(counterForSingleArgument.get()).isEqualTo(0);
+      // we do not desugar requireNonNull(Object, String) or requireNonNull(Object, Supplier)
+      assertThat(counterForString.get()).isEqualTo(1);
+      assertThat(counterForSupplier.get()).isEqualTo(1);
+    } catch (IOException e) {
+      fail();
+    }
+  }
+
+  @Test
+  public void testInliningImplicitCallToObjectsRequireNonNull() {
+    try {
+      ClassCallingRequireNonNull.getStringLengthWithMethodReference(null);
+      fail ("NullPointerException expected");
+    } catch (NullPointerException e) {
+      // Expected
+    }
+
+    assertThat(ClassCallingRequireNonNull.getStringLengthWithMethodReference("")).isEqualTo(0);
+    assertThat(ClassCallingRequireNonNull.getStringLengthWithMethodReference("1")).isEqualTo(1);
+
+    try {
+      ClassCallingRequireNonNull.getStringLengthWithLambdaAndExplicitCallToRequireNonNull(null);
+      fail ("NullPointerException expected");
+    } catch (NullPointerException e) {
+      // Expected
+    }
+
+    assertThat(
+            ClassCallingRequireNonNull.getStringLengthWithLambdaAndExplicitCallToRequireNonNull(""))
+        .isEqualTo(0);
+    assertThat(
+            ClassCallingRequireNonNull.getStringLengthWithLambdaAndExplicitCallToRequireNonNull(
+                "1"))
+        .isEqualTo(1);
+  }
+
+  @Test
+  public void testInliningExplicitCallToObjectsRequireNonNull() {
+    try {
+      ClassCallingRequireNonNull.getFirstCharVersionOne(null);
+      fail ("NullPointerException expected");
+    } catch (NullPointerException e) {
+      // Expected
+    }
+
+    try {
+      ClassCallingRequireNonNull.getFirstCharVersionTwo(null);
+      fail ("NullPointerException expected");
+    } catch (NullPointerException e) {
+      // Expected
+    }
+
+    try {
+      ClassCallingRequireNonNull.callRequireNonNullWithArgumentString(null);
+      fail ("NullPointerException expected");
+    } catch (NullPointerException e) {
+      // Expected
+    }
+
+    try {
+      ClassCallingRequireNonNull.callRequireNonNullWithArgumentSupplier(null);
+      fail ("NullPointerException expected");
+    } catch (NullPointerException e) {
+      // Expected
+    }
+
+    assertThat(ClassCallingRequireNonNull.getFirstCharVersionOne("hello")).isEqualTo('h');
+    assertThat(ClassCallingRequireNonNull.getFirstCharVersionTwo("hello")).isEqualTo('h');
+
+    assertThat(ClassCallingRequireNonNull.callRequireNonNullWithArgumentString("hello"))
+        .isEqualTo('h');
+    assertThat(ClassCallingRequireNonNull.callRequireNonNullWithArgumentSupplier("hello"))
+        .isEqualTo('h');
+  }
+}