Base PGPainlessCLI on new sop-java module

* Rename pgpainless-sop -> pgpainless-cli
* Introduce sop-java (implementation-independent SOP API)
* Introduce sop-java-picocli (CLI frontend for sop-java)
* Introduce pgpainless-sop (implementation of sop-java using PGPainless)
* Rework pgpainless-cli (plugs pgpainless-sop into sop-java-picocli)

sop-java-picocli/src/test/java/sop/cli/picocli/commands/GenerateKeyCmdTest.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright 2020 Paul Schaub.
+ *
+ * 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 sop.cli.picocli.commands;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import com.ginsberg.junit.exit.ExpectSystemExitWithStatus;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InOrder;
+import org.mockito.Mockito;
+import sop.Ready;
+import sop.SOP;
+import sop.cli.picocli.SopCLI;
+import sop.exception.SOPGPException;
+import sop.operation.GenerateKey;
+
+public class GenerateKeyCmdTest {
+
+    GenerateKey generateKey;
+
+    @BeforeEach
+    public void mockComponents() throws SOPGPException.UnsupportedAsymmetricAlgo, SOPGPException.MissingArg, IOException {
+        generateKey = mock(GenerateKey.class);
+        when(generateKey.generate()).thenReturn(new Ready() {
+            @Override
+            public void writeTo(OutputStream outputStream) {
+
+            }
+        });
+
+        SOP sop = mock(SOP.class);
+        when(sop.generateKey()).thenReturn(generateKey);
+
+        SopCLI.setSopInstance(sop);
+    }
+
+    @Test
+    public void noArmor_notCalledByDefault() {
+        SopCLI.main(new String[] {"generate-key", "Alice"});
+        verify(generateKey, never()).noArmor();
+    }
+
+    @Test
+    public void noArmor_passedDown() {
+        SopCLI.main(new String[] {"generate-key", "--no-armor", "Alice"});
+        verify(generateKey, times(1)).noArmor();
+    }
+
+    @Test
+    public void userId_multipleUserIdsPassedDownInProperOrder() {
+        SopCLI.main(new String[] {"generate-key", "Alice <alice@pgpainless.org>", "Bob <bob@pgpainless.org>"});
+
+        InOrder inOrder = Mockito.inOrder(generateKey);
+        inOrder.verify(generateKey).userId("Alice <alice@pgpainless.org>");
+        inOrder.verify(generateKey).userId("Bob <bob@pgpainless.org>");
+
+        verify(generateKey, times(2)).userId(any());
+    }
+
+    @Test
+    @ExpectSystemExitWithStatus(19)
+    public void missingArgumentCausesExit19() throws SOPGPException.UnsupportedAsymmetricAlgo, SOPGPException.MissingArg, IOException {
+        // TODO: RFC4880-bis and the current Stateless OpenPGP CLI spec allow keys to have no user-ids,
+        //  so we might want to change this test in the future.
+        when(generateKey.generate()).thenThrow(new SOPGPException.MissingArg("Missing user-id."));
+        SopCLI.main(new String[] {"generate-key"});
+    }
+
+    @Test
+    @ExpectSystemExitWithStatus(13)
+    public void unsupportedAsymmetricAlgorithmCausesExit13() throws SOPGPException.UnsupportedAsymmetricAlgo, SOPGPException.MissingArg, IOException {
+        when(generateKey.generate()).thenThrow(new SOPGPException.UnsupportedAsymmetricAlgo(new Exception()));
+        SopCLI.main(new String[] {"generate-key", "Alice"});
+    }
+
+    @Test
+    @ExpectSystemExitWithStatus(1)
+    public void ioExceptionCausesExit1() throws SOPGPException.UnsupportedAsymmetricAlgo, SOPGPException.MissingArg, IOException {
+        when(generateKey.generate()).thenReturn(new Ready() {
+            @Override
+            public void writeTo(OutputStream outputStream) throws IOException {
+                throw new IOException();
+            }
+        });
+        SopCLI.main(new String[] {"generate-key", "Alice"});
+    }
+}