Adding tests for Maven plugin

* Adding complete test infrastructure for Maven plugin.
* Plugin is able to work with DI maven container.

Refers to issue #9

plugs-core/pom.xml

@@ -31,6 +31,10 @@
   <name>Plugs :: Plugs Core</name>
 
   <dependencies>
+    <dependency>
+      <groupId>org.apiguardian</groupId>
+      <artifactId>apiguardian-api</artifactId>
+    </dependency>
     <dependency>
       <groupId>pl.wavesoftware</groupId>
       <artifactId>eid-exceptions</artifactId>

plugs-maven-plugin/pom.xml

@@ -32,6 +32,10 @@
   <name>Plugs :: Plugs Maven Plugin</name>
 
   <dependencies>
+    <dependency>
+      <groupId>org.apiguardian</groupId>
+      <artifactId>apiguardian-api</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>
@@ -42,11 +46,21 @@
       <artifactId>maven-core</artifactId>
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-compat</artifactId>
+      <scope>provided</scope>
+    </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-tools</groupId>
       <artifactId>maven-plugin-annotations</artifactId>
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-settings-builder</artifactId>
+      <scope>provided</scope>
+    </dependency>
 
     <!-- Tests -->
     <dependency>

plugs-maven-plugin/src/main/java/pl/wavesoftware/plugs/maven/generator/DefaultWorker.java

@@ -16,12 +16,15 @@
 
 package pl.wavesoftware.plugs.maven.generator;
 
+import org.apiguardian.api.API;
+
 import javax.inject.Named;
 
 /**
  * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
- * @since 2019-01-10
+ * @since 0.1.0
  */
+@API(status = API.Status.EXPERIMENTAL)
 @Named
 final class DefaultWorker implements Worker {
 

plugs-maven-plugin/src/main/java/pl/wavesoftware/plugs/maven/generator/PackagePlugMojo.java

@@ -16,24 +16,33 @@
 
 package pl.wavesoftware.plugs.maven.generator;
 
+import com.google.common.annotations.VisibleForTesting;
 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.ResolutionScope;
+import org.apiguardian.api.API;
+import org.apiguardian.api.API.Status;
 
 import javax.inject.Inject;
 
 /**
+ * A main mojo to generate plug modules
+ *
  * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
  * @since 0.1.0
  */
 @Mojo(
-  name = "package-plug",
+  name = PackagePlugMojo.GOAL,
   defaultPhase = LifecyclePhase.PACKAGE,
   requiresDependencyResolution = ResolutionScope.COMPILE_PLUS_RUNTIME,
   requiresDependencyCollection = ResolutionScope.COMPILE_PLUS_RUNTIME
 )
-final class PackagePlugMojo extends AbstractMojo {
+public final class PackagePlugMojo extends AbstractMojo {
+
+  @SuppressWarnings("WeakerAccess")
+  @API(status = Status.STABLE)
+  public static final String GOAL = "package-plug";
 
   private final Worker worker;
 

plugs-maven-plugin/src/main/java/pl/wavesoftware/plugs/maven/generator/Worker.java

@@ -16,9 +16,12 @@
 
 package pl.wavesoftware.plugs.maven.generator;
 
+import org.apiguardian.api.API;
+
 /**
  * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
- * @since 2019-01-10
+ * @since 0.1.0
  */
+@API(status = API.Status.EXPERIMENTAL)
 interface Worker {
 }

plugs-maven-plugin/src/test/java/pl/wavesoftware/plugs/maven/generator/DefaultMojoConfigurator.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2019 Wave Software
+ *
+ * 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 pl.wavesoftware.plugs.maven.generator;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.MojoExecution;
+import org.apache.maven.plugin.testing.MojoRule;
+import org.apache.maven.project.MavenProject;
+
+import java.nio.file.Path;
+
+/**
+ * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
+ * @since 0.1.0
+ */
+final class DefaultMojoConfigurator implements MojoConfigurator {
+  @Override
+  public MavenSession getMavenSession(MojoRule rule, Path pomDirectory) throws Exception {
+    // setup with pom
+    MavenProject project = rule.readMavenProject(pomDirectory.toFile());
+
+    // Generate session
+    return rule.newMavenSession(project);
+  }
+
+  @Override
+  public MojoExecution getMojoExecution(MojoRule rule, String goal) {
+    // Generate Execution and Mojo for testing
+    return rule.newMojoExecution(goal);
+  }
+}

plugs-maven-plugin/src/test/java/pl/wavesoftware/plugs/maven/generator/MojoBuilder.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2019 Wave Software
+ *
+ * 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 pl.wavesoftware.plugs.maven.generator;
+
+import org.apache.maven.plugin.AbstractMojo;
+
+import java.nio.file.Path;
+
+/**
+ * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
+ * @since 0.1.0
+ */
+public interface MojoBuilder<T extends AbstractMojo> {
+  MojoBuilder<T> withPomDirectory(Path pomDirectory);
+  MojoBuilder<T> withUsingResources(boolean setting);
+  T build(String goal);
+}

plugs-maven-plugin/src/test/java/pl/wavesoftware/plugs/maven/generator/MojoBuilderFactory.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2019 Wave Software
+ *
+ * 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 pl.wavesoftware.plugs.maven.generator;
+
+import org.apache.maven.plugin.AbstractMojo;
+
+/**
+ * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
+ * @since 0.1.0
+ */
+public interface MojoBuilderFactory {
+  MojoBuilderFactory configurator(MojoConfigurator configurator);
+  <T extends AbstractMojo> MojoBuilder<T> builder(Class<T> mojoType);
+}

plugs-maven-plugin/src/test/java/pl/wavesoftware/plugs/maven/generator/MojoBuilderFactoryImpl.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2019 Wave Software
+ *
+ * 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 pl.wavesoftware.plugs.maven.generator;
+
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.testing.MojoRule;
+
+/**
+ * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
+ * @since 2019-01-11
+ */
+final class MojoBuilderFactoryImpl implements MojoBuilderFactory {
+
+  private final MojoRule rule;
+
+  private MojoConfigurator configurator = new DefaultMojoConfigurator();
+
+  MojoBuilderFactoryImpl(MojoRule rule) {
+    this.rule = rule;
+  }
+
+  @Override
+  public MojoBuilderFactory configurator(MojoConfigurator configurator) {
+    this.configurator = configurator;
+    return this;
+  }
+
+  @Override
+  public <T extends AbstractMojo> MojoBuilder<T> builder(Class<T> mojoType) {
+    return new MojoBuilderImpl<>(rule, mojoType, configurator);
+  }
+}

plugs-maven-plugin/src/test/java/pl/wavesoftware/plugs/maven/generator/MojoBuilderImpl.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2019 Wave Software
+ *
+ * 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 pl.wavesoftware.plugs.maven.generator;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecution;
+import org.apache.maven.plugin.testing.MojoRule;
+
+import java.io.File;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import static pl.wavesoftware.eid.utils.EidExecutions.tryToExecute;
+import static pl.wavesoftware.eid.utils.EidPreconditions.checkNotNull;
+
+/**
+ * @author <a href="mailto:krzysztof.suszynski@wavesoftware.pl">Krzysztof Suszynski</a>
+ * @since 0.1.0
+ */
+final class MojoBuilderImpl<T extends AbstractMojo>
+  implements MojoBuilder<T> {
+
+  private final MojoRule mojoRule;
+  private final Class<T> type;
+  private final MojoConfigurator configurator;
+
+  private Path pomDirectory = Paths.get(".");
+  private boolean usingResources = true;
+
+  MojoBuilderImpl(MojoRule mojoRule, Class<T> type, MojoConfigurator configurator) {
+    this.mojoRule = mojoRule;
+    this.type = type;
+    this.configurator = configurator;
+  }
+
+  @Override
+  public MojoBuilder<T> withPomDirectory(Path pomDirectory) {
+    this.pomDirectory = pomDirectory;
+    return this;
+  }
+
+  @Override
+  public MojoBuilder<T> withUsingResources(boolean setting) {
+    this.usingResources = setting;
+    return this;
+  }
+
+  @Override
+  public T build(String goal) {
+    return tryToExecute(() -> {
+      MavenSession session = configurator.getMavenSession(
+        mojoRule, getPomDirectory()
+      );
+      MojoExecution execution = configurator.getMojoExecution(
+        mojoRule,
+        goal
+      );
+      org.apache.maven.plugin.Mojo mojo =
+        mojoRule.lookupConfiguredMojo(session, execution);
+      return type.cast(mojo);
+    }, "20190111:223034");
+  }
+
+  private Path getPomDirectory() throws URISyntaxException {
+    if (usingResources) {
+      URL url = checkNotNull(
+         type.getClassLoader().getResource(pomDirectory.toString()),
+        "20190111:224609"
+      );
+      File file = new File(url.toURI());
+      return file.toPath();
+    }
+    return pomDirectory;
+  }
+}