[tests] Use Os-specific flags for launching Tycho.

When running the unit tests with Tycho on Maven, the Mac operating
system requires specific flags for launching Tycho.
A profile based on the current OS is added.

Signed-off-by: Stéphane Galland <galland@arakhne.org>

tests/pom.xml

@@ -12,6 +12,10 @@
 	<packaging>pom</packaging>
 	<name>Tests Parent</name>
 
+	<properties>
+		<tycho-surefire-plugin-os-jvm-flags></tycho-surefire-plugin-os-jvm-flags>
+	</properties>
+
 	<modules>
 		<module>io.sarl.tests.testdata</module>
 		<module>io.sarl.tests.api</module>
@@ -37,6 +41,18 @@
 	<!-- ==== Plugins Building Management === -->
 	<!-- ======================================= -->
 
+	<profiles>
+		<profile>
+			<id>tycho-surefire-plugin-macosx-jvm-flags</id>
+			<activation>
+				<os><family>mac</family></os>
+			</activation>
+			<properties>
+				<tycho-surefire-plugin-os-jvm-flags>-XstartOnFirstThread</tycho-surefire-plugin-os-jvm-flags>
+			</properties>
+		</profile>
+	</profiles>
+
 	<build>
 		<!-- The build configurations are inside the submodules for avoiding to 
 			propagate the information outside a specific module -->
@@ -46,7 +62,7 @@
 					<groupId>org.eclipse.tycho</groupId>
 					<artifactId>tycho-surefire-plugin</artifactId>
 					<configuration>
-						<argLine>-ea</argLine>
+						<argLine>-ea ${tycho-surefire-plugin-os-jvm-flags}</argLine>
 					</configuration>
 				</plugin>
 			</plugins>