Use platform dependent path to dependency jar

Author: dnestoro

native-maven-plugin/src/functionalTest/groovy/org/graalvm/buildtools/maven/JavaApplicationWithTestsFunctionalTest.groovy

@@ -159,9 +159,11 @@ class JavaApplicationWithTestsFunctionalTest extends AbstractGraalVMMavenFunctio
         when:
         mvn '-Pnative', '-DquickBuild', 'test'
 
+        def expectedOutput = ["local-repo", "org", "apache", "commons", "commons-lang3", "3.12.0", "commons-lang3-3.12.0.jar"].join(File.separator)
+
         then:
         buildSucceeded
-        outputContains "local-repo/org/apache/commons/commons-lang3/3.12.0/commons-lang3-3.12.0.jar"
+        outputContains expectedOutput
     }
 
     def "dependencies with scope provided are not on classpath for main binary"() {
@@ -170,9 +172,11 @@ class JavaApplicationWithTestsFunctionalTest extends AbstractGraalVMMavenFunctio
         when:
         mvn '-Pnative', '-DquickBuild', '-DskipNativeTests', 'package'
 
+        def expectedOutput = ["local-repo", "org", "apache", "commons", "commons-lang3", "3.12.0", "commons-lang3-3.12.0.jar"].join(File.separator)
+
         then:
         buildSucceeded
-        outputDoesNotContain "local-repo/org/apache/commons/commons-lang3/3.12.0/commons-lang3-3.12.0.jar"
+        outputDoesNotContain expectedOutput
     }
 
 }