pm2-less integration tests (#314)

`pm2` has very confusing license. Let's try to get rid of it. 

Locally, seems to work fine and survive repeated executions.

Author: vmikhailenko

.github/workflows/maven.yml

@@ -9,7 +9,7 @@ on:
       - main
       - postgres
   pull_request:
-    branches: 
+    branches:
       - main
       - postgres
 
@@ -27,4 +27,4 @@ jobs:
         java-version: 17
         distribution: 'temurin'
     - name: Build with Maven
-      run: mvn -B clean install
+      run: mvn -ntp -B clean install

integration-tests/pom.xml

@@ -15,6 +15,7 @@
 
 	<properties>
 		<sidecar.dir>../mtx/sidecar</sidecar.dir>
+		<cds.node.executable>node</cds.node.executable>
 	</properties>
 
 	<dependencies>
@@ -82,46 +83,52 @@
 				<artifactId>cds-maven-plugin</artifactId>
 				<version>${cds.services.version}</version>
 				<executions>
-					<!-- Following steps start and stop MTX sidecar for tests executed by failsafe plugin -->
 					<execution>
-						<id>install-sidecar</id>
+						<id>cds.install-node</id>
 						<goals>
-							<goal>npm</goal>
+							<goal>install-node</goal>
 						</goals>
-						<phase>pre-integration-test</phase>
 						<configuration>
-							<arguments>install --no-save</arguments>
-							<skip>${skipTests}</skip>
-							<workingDirectory>${sidecar.dir}</workingDirectory>
+							<skip>${cdsdk-global}</skip>
 						</configuration>
 					</execution>
 
 					<execution>
-						<id>start-sidecar</id>
+						<id>install-sidecar</id>
 						<goals>
-							<goal>npx</goal>
+							<goal>npm</goal>
 						</goals>
 						<phase>pre-integration-test</phase>
 						<configuration>
-							<arguments>pm2 -l sidecar.log --time start --name=sidecar npm -- run start</arguments>
+							<arguments>install --no-save</arguments>
 							<skip>${skipTests}</skip>
 							<workingDirectory>${sidecar.dir}</workingDirectory>
 						</configuration>
 					</execution>
+				</executions>
+			</plugin>
 
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>exec-maven-plugin</artifactId>
+				<version>3.2.0</version>
+				<executions>
 					<execution>
-						<id>stop-sidecar</id>
+						<phase>pre-integration-test</phase>
+						<id>start-sidecar</id>
 						<goals>
-							<goal>npx</goal>
+							<goal>exec</goal>
 						</goals>
-						<phase>post-integration-test</phase>
-						<configuration>
-							<arguments>pm2 delete sidecar</arguments>
-							<skip>${skipTests}</skip>
-							<workingDirectory>${sidecar.dir}</workingDirectory>
-						</configuration>
 					</execution>
 				</executions>
+				<configuration>
+					<executable>${cds.node.executable}</executable>
+					<skip>${skipTests}</skip>
+					<workingDirectory>${sidecar.dir}</workingDirectory>
+					<async>true</async>
+					<useMavenLogger>true</useMavenLogger>
+					<commandlineArgs>node_modules/@sap/cds/bin/cds-serve.js</commandlineArgs>
+				</configuration>
 			</plugin>
 		</plugins>
 	</build>

mtx/sidecar/package.json

@@ -9,8 +9,7 @@
     "@sap/hdi-deploy": "4.8.2"
   },
   "devDependencies": {
-    "sqlite3": "^5",
-    "pm2": "^5.3.0"
+    "sqlite3": "^5"
   },
   "engines": {
     "node": "^18"