Add unit test to cover multiple incoming edges

src/test/java/org/mastodon/mamut/feature/dimensionalityreduction/umap/UmapControllerTest.java

@@ -10,6 +10,7 @@
 import org.mastodon.mamut.feature.spot.dimensionalityreduction.umap.SpotUmapFeature;
 import org.mastodon.mamut.model.Link;
 import org.mastodon.mamut.model.Model;
+import org.mastodon.mamut.model.ModelGraph;
 import org.mastodon.mamut.model.Spot;
 import org.mastodon.mamut.model.branch.BranchLink;
 import org.mastodon.mamut.model.branch.BranchSpot;
@@ -148,4 +149,33 @@ void testPartiallyIllegalData()
 			assertTrue( Double.isNaN( projection0.value( graph2.spot13 ) ) );
 		}
 	}
+
+	@Test
+	void testMultipleIncomingEdges()
+	{
+		Model model = new Model();
+		ModelGraph graph = model.getGraph();
+		Spot spot00 = graph.addVertex().init( 0, new double[] { 0, 0, 0 }, 0 );
+		Spot spot01 = graph.addVertex().init( 0, new double[] { 3, 4, 0 }, 0 );
+		Spot spot02 = graph.addVertex().init( 0, new double[] { 6, 8, 0 }, 0 );
+		Spot spot1 = graph.addVertex().init( 1, new double[] { 3, 4, 0 }, 0 );
+		graph.addEdge( spot00, spot1 ).init();
+		graph.addEdge( spot01, spot1 ).init();
+		graph.addEdge( spot02, spot1 ).init();
+
+		try (Context context = new Context())
+		{
+			UmapController umapController = new UmapController( model, context );
+			FeatureModel featureModel = model.getFeatureModel();
+			Supplier< List< UmapInputDimension< Spot, Link > > > inputDimensionsSupplier =
+					() -> UmapInputDimension.getListFromFeatureModel( featureModel, Spot.class, Link.class );
+			umapController.computeFeature( inputDimensionsSupplier );
+			Feature< Spot > spotUmapFeature = Cast.unchecked( featureModel.getFeature( SpotUmapFeature.GENERIC_SPEC ) );
+			Set< FeatureProjection< Spot > > projections = spotUmapFeature.projections();
+			assertEquals( 2, projections.size() );
+			FeatureProjection< Spot > projection0 = spotUmapFeature.projections().iterator().next();
+			assertFalse( Double.isNaN( projection0.value( spot1 ) ) );
+		}
+	}
+
 }