Improve DirectoryTarResourceTest to use synthetic JAR

core/src/test/java/org/testcontainers/utility/DirectoryTarResourceTest.java

@@ -56,7 +56,7 @@ public void simpleRecursiveClasspathResourceTest() throws TimeoutException {
                                         .copy("/tmp/foo", "/foo")
                                         .cmd("ls -lRt /foo")
                                         .build()
-                        ).withFileFromClasspath("/tmp/foo", "/org/junit"))          // here we use /org/junit as a directory that really should exist on the classpath
+                        ).withFileFromClasspath("/tmp/foo", "/recursive/dir"))          // here we use /org/junit as a directory that really should exist on the classpath
                 .withStartupCheckStrategy(new OneShotStartupCheckStrategy())
                 .withLogConsumer(wait.andThen(toString));
 
@@ -66,6 +66,6 @@ public void simpleRecursiveClasspathResourceTest() throws TimeoutException {
         final String results = toString.toUtf8String();
 
         // ExternalResource.class is known to exist in a subdirectory of /org/junit so should be successfully copied in
-        assertTrue("The container has a file that was copied in via a recursive copy from a JAR resource", results.contains("ExternalResource.class"));
+        assertTrue("The container has a file that was copied in via a recursive copy from a JAR resource", results.contains("content.txt"));
     }
 }

testlib/create_fakejar.sh

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
 rm fakejar.jar
-zip -r fakejar.jar META-INF
+zip -r fakejar.jar META-INF/ recursive/

testlib/recursive/dir/content.txt

@@ -0,0 +1 @@
+This is example content to show recursive mounting of files from inside a JAR archive.