Layered: Add tests for #905

test/org.eclipse.elk.alg.layered.test/src/org/eclipse/elk/alg/layered/issues/Issue905Test.java

@@ -0,0 +1,92 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Kiel University and others.
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package org.eclipse.elk.alg.layered.issues;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.List;
+
+import org.eclipse.elk.alg.layered.options.LayeredOptions;
+import org.eclipse.elk.alg.test.framework.LayoutTestRunner;
+import org.eclipse.elk.alg.test.framework.annotations.Algorithm;
+import org.eclipse.elk.alg.test.framework.annotations.DefaultConfiguration;
+import org.eclipse.elk.alg.test.framework.annotations.GraphResourceProvider;
+import org.eclipse.elk.alg.test.framework.io.AbstractResourcePath;
+import org.eclipse.elk.alg.test.framework.io.ModelResourcePath;
+import org.eclipse.elk.core.options.EdgeLabelPlacement;
+import org.eclipse.elk.graph.ElkEdge;
+import org.eclipse.elk.graph.ElkLabel;
+import org.eclipse.elk.graph.ElkNode;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import com.google.common.collect.Lists;
+
+/**
+ * Test for issue 905.
+ */
+@RunWith(LayoutTestRunner.class)
+@Algorithm(LayeredOptions.ALGORITHM_ID)
+@DefaultConfiguration
+public class Issue905Test {
+
+    //////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // Sources
+
+    @GraphResourceProvider
+    public List<AbstractResourcePath> testGraphs() {
+        return Lists.newArrayList(
+                // 2 identical graph except the location of the labels of the edge
+                new ModelResourcePath("tickets/layered/905_beginLabelAboveEdge.elkt"),
+                new ModelResourcePath("tickets/layered/905_beginLableBellowEdge.elkt"));
+    }
+
+    //////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // Tests
+
+    @Test
+    public void testEdgeLabelAlignment(final ElkNode graph) {
+        assertEquals("Wrong input graph: The graph must contained one node.", 1, graph.getChildren().size());
+        assertEquals("Wrong input graph: The node of the graph must contained one edge.", 1, graph.getChildren().get(0).getContainedEdges().size());
+        testBegingLabel(graph.getChildren().get(0).getContainedEdges().get(0));
+    }
+
+    /**
+     * Check that the labels of the edge is at the same location after layout, independently of the location before the layout. Only tail label is problematic with issue 905.
+     * @param edge The edge having labels to check
+     */
+    private void testBegingLabel(final ElkEdge edge) {
+        double expectedXLocationForTailLabel = 10;
+        double expectedYLocationForTailLabel = 92;
+
+        double expectedXLocationForCenterLabel = 61;
+        double expectedYLocationForCenterLabel = 91;
+
+        double expectedXLocationForHeadLabel = 124;
+        double expectedYLocationForHeadLabel = 92;
+
+
+        for (ElkLabel label : edge.getLabels()) {
+            EdgeLabelPlacement currentLabelPlacement = label.getProperty(LayeredOptions.EDGE_LABELS_PLACEMENT);
+            if (EdgeLabelPlacement.TAIL.equals(currentLabelPlacement)) {
+                assertEquals("The x location of the tail label is wrong after layout.", expectedXLocationForTailLabel, label.getX(), 0);
+                assertEquals("The y location of the tail label is wrong after layout.", expectedYLocationForTailLabel, label.getY(), 0);
+            } else if (EdgeLabelPlacement.CENTER.equals(currentLabelPlacement)) {
+                assertEquals("The x location of the center label is wrong after layout.", expectedXLocationForCenterLabel, label.getX(), 0);
+                assertEquals("The y location of the center label is wrong after layout.", expectedYLocationForCenterLabel, label.getY(), 0);
+            } else if (EdgeLabelPlacement.HEAD.equals(currentLabelPlacement)) {
+                assertEquals("The x location of the head label is wrong after layout.", expectedXLocationForHeadLabel, label.getX(), 0);
+                assertEquals("The y location of the head label is wrong after layout.", expectedYLocationForHeadLabel, label.getY(), 0);
+            }
+        }
+    }
+
+
+}