Move jssc.boot.library.path to pom per comments

pom.xml

@@ -279,6 +279,12 @@
         <artifactId>maven-surefire-plugin</artifactId>
         <version>${plugin.surfire.version}</version>
         <configuration>
+          <!-- Ensure junit tests can access recently compiled binaries -->
+          <systemPropertyVariables>
+            <jssc.boot.library.path>${project.build.directory}/cmake/natives/</jssc.boot.library.path>
+          </systemPropertyVariables>
+
+          <!-- Separate JVMs between classes; Needed for "jssc.boot.library.path" test to be effective -->
           <reuseForks>false</reuseForks>
           <excludes>
             <!--suppress UnresolvedMavenProperty -->

src/test/java/jssc/SerialNativeInterfaceTest.java

@@ -1,6 +1,5 @@
 package jssc;
 
-import jssc.bootpath.Helper;
 import org.junit.Assume;
 import org.junit.Test;
 
@@ -11,12 +10,6 @@
 import static org.junit.Assert.fail;
 
 public class SerialNativeInterfaceTest {
-    // Ensure library is loaded from /target/cmake/natives
-    static {
-        Helper.fixNativesPath();
-    }
-
-
     @Test
     public void testInitNativeInterface() {
         SerialNativeInterface serial = new SerialNativeInterface();

src/test/java/jssc/VirtualPortTest.java

@@ -25,17 +25,12 @@
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 
-import jssc.bootpath.Helper;
 import jssc.junit.rules.VirtualPortRule;
 import org.junit.Assume;
 import org.junit.Rule;
 import org.junit.Test;
 
 public class VirtualPortTest {
-  static {
-    Helper.fixNativesPath();
-  }
-
   private static final String HELLO_WORLD = "Hello, world!";
 
   private final byte[] bytes;

src/test/java/jssc/bootpath/ManualBootLibraryPathFailedTest.java

@@ -10,12 +10,20 @@
  * Tests if a valid <code>jssc.boot.library.path</code> which does NOT contain a native library
  * will predictably fail.  This test can be run regardless of whether or not a native binary was
  * created during the build process.
+ *
+ * <code>jssc.boot.library.path</code> is configured in surefire's <code>systemPropertyVariables</code> section,
+ * so we must override it below.
+ *
+ * IMPORTANT: Invocations MUST be in their own class to run in a separate JVM (https://stackoverflow.com/questions/68657855)
+ * - JUnit does NOT currently offer JVM unloading between methods.
+ * - maven-surefire-plugin DOES offer JVM unloading between classes using <code>reuseForks=false</code>
+ * - Unloading is needed due to NativeLoader.loadLibrary(...) calls System.loadLibrary(...) which is static
  */
 public class ManualBootLibraryPathFailedTest {
     @Test
     public void testBootPathOverride() {
         // Ensure library is not found
-        Helper.breakNativesPath();
+        System.setProperty("jssc.boot.library.path", "/" /* unlikely location */);
         try {
             SerialNativeInterface.getNativeLibraryVersion();
             fail("Library loading should fail if path provided exists but does not contain a native library");

src/test/java/jssc/bootpath/ManualBootLibraryPathTest.java

@@ -9,14 +9,19 @@
 
 /**
  * Tests if a valid <code>jssc.boot.library.path</code> which DOES contain a native library
- * will predictably pass.  This test can ONLY be run regardless if a native binary was created
+ * will predictably pass.  This test can ONLY be run if a native binary was created
  * during the build process.  See also <code>maven.exclude.tests</code>.
+ *
+ * <code>jssc.boot.library.path</code> is configured in surefire's <code>systemPropertyVariables</code> section.
+ *
+ * IMPORTANT: Invocations MUST be in their own class to run in a separate JVM (https://stackoverflow.com/questions/68657855)
+ * - JUnit does NOT currently offer JVM unloading between methods.
+ * - maven-surefire-plugin DOES offer JVM unloading between classes using <code>reuseForks=false</code>
+ * - Unloading is needed due to NativeLoader.loadLibrary(...) calls System.loadLibrary(...) which is static
  */
 public class ManualBootLibraryPathTest {
     @Test
     public void testBootPathOverride() {
-        // Ensure library is loaded from /target/cmake/natives
-        Helper.fixNativesPath();
         try {
             final String nativeLibraryVersion = SerialNativeInterface.getNativeLibraryVersion();
             assertThat(nativeLibraryVersion, is(not(nullValue())));