Skip executing some plugins when skipping tests (#1418)

* Skip some plugins when skipping tests

* Add instruction in BUILD.md to install eclair-core to repo

* Reorganize BUILD.md with subsections

BUILD.md

@@ -8,7 +8,7 @@
 
 ## Build
 
-Eclair is packaged as a compressed archive with a launcher script, the archives are built deterministically
+Eclair is packaged as a compressed archive with a launcher script. The archives are built deterministically
 so it's possible to reproduce the build and verify its equality byte-by-byte. To build the exact same artifacts
 that we release, you must use the build environment (OS, JDK, maven...) that we specify in our release notes.
 
@@ -18,24 +18,29 @@ To build the project and run the tests, simply run:
 mvn package
 ```
 
-NB: if the build fails, you may need to clean previously built artifacts with the `mvn clean` command.
-NB: some of the tests use [Docker](https://www.docker.com/), so make sure your docker daemon is running.
+Notes:
+- This command will build all modules (core, node, gui).
+- If the build fails, you may need to clean previously built artifacts with the `mvn clean` command.
+- Some of the tests use [Docker](https://www.docker.com/), so make sure your docker daemon is running.
+- Archives can be found in the `target` folder for each module.
 
-### Other build options
+### Skip tests
 
-To skip all tests, run:
+Running tests takes time. If you want to skip them, use `-DskipTests`:
 
 ```shell
 mvn package -DskipTests
 ```
 
-To only build the `eclair-node` module, run:
+You can even skip the tests compilation with `maven.test.skip`:
 
 ```shell
-mvn package -pl eclair-node -am -DskipTests
+mvn package -Dmaven.test.skip=true
 ```
 
-To run the tests, run:
+### Run tests
+
+To only run the tests, run:
 
 ```shell
 mvn test
@@ -47,6 +52,20 @@ To run tests for a specific class, run:
 mvn test -Dsuites=*<TestClassName>
 ```
 
+### Build specific module
+
+To only build the `eclair-node` module, run:
+
+```shell
+mvn package -pl eclair-node -am -Dmaven.test.skip=true
+```
+
+To install `eclair-core` into your local maven repository and use it in another project, run:
+
+```shell
+mvn clean install -pl eclair-core -am -Dmaven.test.skip=true
+```
+
 ## Build the API documentation
 
 ### Slate

eclair-core/pom.xml

@@ -43,6 +43,7 @@
                             <goal>wget</goal>
                         </goals>
                         <configuration>
+                            <skip>${maven.test.skip}</skip>
                             <url>${bitcoind.url}</url>
                             <unpack>true</unpack>
                             <outputDirectory>${project.build.directory}</outputDirectory>

pom.xml

@@ -160,6 +160,7 @@
                             <goal>doc-jar</goal>
                         </goals>
                         <configuration>
+                            <skip>${maven.test.skip}</skip>
                             <args>
                                 <arg>-no-link-warnings</arg>
                             </args>
@@ -246,6 +247,7 @@
                 <artifactId>scoverage-maven-plugin</artifactId>
                 <version>1.4.0-RC1</version>
                 <configuration>
+                    <skip>${maven.test.skip}</skip>
                     <scalaVersion>${scala.version}</scalaVersion>
                 </configuration>
             </plugin>