Don't prompt to confirm non-mutating nomulus EPP tool commands

This is accomplished by making all non-mutating commands function with dry run set
to true, which also has the pleasurable side effect of not prompting for dry-run
mutating commands either, which also do nothing different/special on the second
run.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192149150

javatests/google/registry/tools/NonMutatingEppToolCommandTest.java

@@ -0,0 +1,72 @@
+// Copyright 2018 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 google.registry.testing.JUnitBackports.assertThrows;
+
+import com.beust.jcommander.Parameter;
+import com.beust.jcommander.Parameters;
+import google.registry.tools.server.ToolsTestData;
+import java.util.List;
+import org.junit.Test;
+
+/** Unit tests for {@link NonMutatingEppToolCommand}. */
+public class NonMutatingEppToolCommandTest
+    extends EppToolCommandTestCase<NonMutatingEppToolCommand> {
+
+  /** Dummy implementation of NonMutatingEppToolCommand. */
+  @Parameters(separators = " =", commandDescription = "Dummy NonMutatingEppToolCommand")
+  static class TestNonMutatingEppToolCommand extends NonMutatingEppToolCommand {
+
+    @Parameter(names = {"--client"})
+    String clientId;
+
+    @Parameter
+    List<String> xmlPayloads;
+
+    @Override
+    void initEppToolCommand() {
+      for (String xmlData : xmlPayloads) {
+        addXmlCommand(clientId, xmlData);
+      }
+    }
+  }
+
+  @Override
+  protected NonMutatingEppToolCommand newCommandInstance() {
+    return new TestNonMutatingEppToolCommand();
+  }
+
+  @Test
+  public void testSuccess_doesntPrompt_whenNotForced() throws Exception {
+    // The choice of xml file is arbitrary.
+    runCommand("--client=NewRegistrar", ToolsTestData.loadFile("domain_check.xml"));
+    eppVerifier.expectDryRun().verifySent("domain_check.xml");
+  }
+
+  @Test
+  public void testFailure_doesntAllowForce() {
+    Exception e =
+        assertThrows(
+            IllegalArgumentException.class,
+            () ->
+                runCommand(
+                    "--force",
+                    "--client=NewRegistrar",
+                    ToolsTestData.loadFile("domain_check.xml")));
+    assertThat(e).hasMessageThat().contains("--force is unnecessary");
+  }
+}