SOP: Properly return error codes to the caller, error code 37 for invalid input args

pgpainless-sop/src/test/java/org/pgpainless/sop/ExitCodeTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2021 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 org.pgpainless.sop;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+import picocli.CommandLine;
+
+public class ExitCodeTest {
+
+    @Test
+    public void testUnknownCommand_69() {
+        assertEquals(69, new CommandLine(new PGPainlessCLI()).execute("generate-kex"));
+    }
+
+    @Test
+    public void testCommandWithUnknownOption_37() {
+        assertEquals(37, new CommandLine(new PGPainlessCLI()).execute("generate-key", "-k", "\"k is unknown\""));
+    }
+
+    @Test
+    public void successfulVersion_0 () {
+        assertEquals(0, new CommandLine(new PGPainlessCLI()).execute("version"));
+    }
+}