test threaded

src/test/java/gov/usgs/earthquake/nshmp/model/NshmTestUtils.java

@@ -63,7 +63,7 @@ class NshmTestUtils {
     return new NshmModel(
         nshm,
         ModelLoader.load(nshm.modelPath()),
-        Executors.newFixedThreadPool(1));
+        Executors.newFixedThreadPool(cores));
   }
 
   /**

src/test/java/gov/usgs/earthquake/nshmp/model/NshmTests.java

@@ -8,6 +8,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.Executors;
 import java.util.logging.Logger;
 
 import org.junit.jupiter.api.Test;
@@ -145,7 +146,10 @@ class NshmTests {
    */
   @Test
   final void testConus2018() throws IOException {
-    NshmTestUtils.testNshm(NSHMS.get("nshm-conus-2018"), Optional.ofNullable(getSite()));
+    var service = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
+    service.execute(() -> {
+      NshmTestUtils.testNshm(NSHMS.get("nshm-conus-2018"), Optional.ofNullable(getSite()));
+    });
   }
 
   /**