Don't NPE when nomulus tool is run without a subcommand (#564)

* Don't NPE when nomulus tool is run without a subcommand

This occurred when an environment was specified but without a subcommand. Now,
the list of valid subcommands is outputted instead of seeing a generic NPE.

This also makes some formatting changes in other files that were causing the
incremental format check to fail.

* Try AppEngineRule

core/src/test/java/google/registry/persistence/converter/VKeyConverterTest.java

@@ -45,8 +45,8 @@ public class VKeyConverterTest {
     jpaTm().transact(() -> jpaTm().getEntityManager().persist(original));
 
     TestEntity retrieved =
-        jpaTm().transact(
-            () -> jpaTm().getEntityManager().find(TestEntity.class, "TheRealSpartacus"));
+        jpaTm()
+            .transact(() -> jpaTm().getEntityManager().find(TestEntity.class, "TheRealSpartacus"));
     assertThat(retrieved.other.getSqlKey()).isEqualTo("ImSpartacus!");
   }
 
@@ -60,8 +60,7 @@ public class VKeyConverterTest {
 
   @Entity(name = "TestEntity")
   static class TestEntity {
-    @Id
-    String id;
+    @Id String id;
 
     // Specifying "@Converter(autoApply = true) on TestEntityVKeyConverter this doesn't seem to
     // work.

core/src/test/java/google/registry/tools/RegistrarContactCommandTest.java

@@ -98,19 +98,20 @@ public class RegistrarContactCommandTest extends CommandTestCase<RegistrarContac
         "--visible_in_domain_whois_as_abuse=false",
         "NewRegistrar");
     RegistrarContact registrarContact = loadRegistrar("NewRegistrar").getContacts().asList().get(1);
-    assertThat(registrarContact).isEqualTo(
-        new RegistrarContact.Builder()
-            .setParent(registrar)
-            .setName("Judith Registrar")
-            .setEmailAddress("judith.doe@example.com")
-            .setRegistryLockEmailAddress("judith.doe@external.com")
-            .setPhoneNumber("+1.2125650000")
-            .setFaxNumber("+1.2125650001")
-            .setTypes(ImmutableSet.of(WHOIS))
-            .setVisibleInWhoisAsAdmin(true)
-            .setVisibleInWhoisAsTech(false)
-            .setVisibleInDomainWhoisAsAbuse(false)
-            .build());
+    assertThat(registrarContact)
+        .isEqualTo(
+            new RegistrarContact.Builder()
+                .setParent(registrar)
+                .setName("Judith Registrar")
+                .setEmailAddress("judith.doe@example.com")
+                .setRegistryLockEmailAddress("judith.doe@external.com")
+                .setPhoneNumber("+1.2125650000")
+                .setFaxNumber("+1.2125650001")
+                .setTypes(ImmutableSet.of(WHOIS))
+                .setVisibleInWhoisAsAdmin(true)
+                .setVisibleInWhoisAsTech(false)
+                .setVisibleInDomainWhoisAsAbuse(false)
+                .build());
   }
 
   @Test
@@ -305,17 +306,18 @@ public class RegistrarContactCommandTest extends CommandTestCase<RegistrarContac
         "--visible_in_domain_whois_as_abuse=true",
         "NewRegistrar");
     RegistrarContact registrarContact = loadRegistrar("NewRegistrar").getContacts().asList().get(1);
-    assertThat(registrarContact).isEqualTo(
-        new RegistrarContact.Builder()
-            .setParent(registrar)
-            .setName("Jim Doe")
-            .setEmailAddress("jim.doe@example.com")
-            .setRegistryLockEmailAddress("jim.doe@external.com")
-            .setTypes(ImmutableSet.of(ADMIN, ABUSE))
-            .setVisibleInWhoisAsAdmin(true)
-            .setVisibleInWhoisAsTech(false)
-            .setVisibleInDomainWhoisAsAbuse(true)
-            .build());
+    assertThat(registrarContact)
+        .isEqualTo(
+            new RegistrarContact.Builder()
+                .setParent(registrar)
+                .setName("Jim Doe")
+                .setEmailAddress("jim.doe@example.com")
+                .setRegistryLockEmailAddress("jim.doe@external.com")
+                .setTypes(ImmutableSet.of(ADMIN, ABUSE))
+                .setVisibleInWhoisAsAdmin(true)
+                .setVisibleInWhoisAsTech(false)
+                .setVisibleInDomainWhoisAsAbuse(true)
+                .build());
     assertThat(registrarContact.getGaeUserId()).isNull();
   }
 

core/src/test/java/google/registry/tools/RegistryToolTest.java

@@ -0,0 +1,88 @@
+// Copyright 2020 The Nomulus 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 google.registry.tools;
+
+import static com.google.common.truth.Truth.assertThat;
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.junit.Assert.assertThrows;
+
+import google.registry.testing.AppEngineRule;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.util.concurrent.locks.ReentrantLock;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+/** Unit tests for {@link google.registry.tools.RegistryTool}. */
+public class RegistryToolTest {
+
+  @RegisterExtension
+  public final AppEngineRule appEngine = AppEngineRule.builder().withDatastoreAndCloudSql().build();
+
+  // Lock for stdout/stderr.  Note that this is static: since we're dealing with globals, we need
+  // to lock for the entire JVM.
+  private static final ReentrantLock stdoutLock = new ReentrantLock();
+
+  private PrintStream oldStdout;
+  private final ByteArrayOutputStream stdout = new ByteArrayOutputStream();
+
+  @BeforeEach
+  void beforeEach() {
+    // Capture standard output/error. This is problematic because gradle tests run in parallel in
+    // the same JVM.  So first lock out any other tests in this JVM that are trying to do this
+    // trick.
+    // TODO(mcilwain): Turn this into a JUnit 5 extension.
+    stdoutLock.lock();
+    oldStdout = System.out;
+    System.setOut(new PrintStream(stdout));
+  }
+
+  @AfterEach
+  final void afterEach() {
+    System.setOut(oldStdout);
+    stdoutLock.unlock();
+  }
+
+  @Test
+  void test_displayAvailableCommands() throws Exception {
+    RegistryTool.main(new String[] {"-e", "unittest", "--commands"});
+    // Check for the existence of a few common commands.
+    assertThat(getStdout()).contains("login");
+    assertThat(getStdout()).contains("check_domain");
+    assertThat(getStdout()).contains("get_tld");
+  }
+
+  @Test
+  void test_noSubcommandSpecified_displaysAvailableCommands() throws Exception {
+    RegistryTool.main(new String[] {"-e", "unittest"});
+    assertThat(getStdout()).contains("The list of available subcommands is:");
+    assertThat(getStdout()).contains("login");
+    assertThat(getStdout()).contains("check_domain");
+    assertThat(getStdout()).contains("get_tld");
+  }
+
+  @Test
+  void test_noEnvironmentSpecified_throwsCorrectError() {
+    IllegalArgumentException thrown =
+        assertThrows(IllegalArgumentException.class, () -> RegistryTool.main(new String[] {}));
+    assertThat(thrown).hasMessageThat().contains("Please specify the environment flag");
+  }
+
+  private String getStdout() {
+    return new String(stdout.toByteArray(), UTF_8);
+  }
+}