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test: add unit tests for GraphVoronoiPartitioner (13) and CentralityRadarExporter (9)
GraphVoronoiPartitionerTest covers: - Constructor validation (null graph, null/empty seeds, unknown seed) - Single-seed BFS absorbs reachable component and reports correct distances - Two-seed midpoint split with alphabetical tie-break (A wins over E at equidistant C) - Disconnected components are reported via VoronoiResult.unreachable - CellStats correctly count size, internal edges, and density on triangle+pendant - Dual-graph adjacency matches boundary edges on a 3-seed line - VoronoiResult collections (assignment/cells/unreachable/boundaryEdges) are unmodifiable - toText() reports seed headers, density, boundary edges, and unreachable count - exportHtml() produces non-trivial document with Legend, Cell Details, and Adjacency sections CentralityRadarExporterTest covers: - Null-graph constructor rejection - Empty-graph path produces well-formed HTML (DATA=[], 'All (0)') - Required DOM scaffolding present (canvas, table, search, topN, sortBy, themeBtn, stats) - All node ids appear in the embedded DATA JSON literal - Default and custom titles render in <title> - XSS escaping: <script> title is escaped, not injected raw - File export writes byte-equal copy of exportToString() - Null File argument fails fast Total: 22 new tests, all green via mvn surefire under Java 17.
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‎Gvisual/test/gvisual/CentralityRadarExporterTest.java‎

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package gvisual;
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import edu.uci.ics.jung.graph.Graph;
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import edu.uci.ics.jung.graph.UndirectedSparseGraph;
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import org.junit.Before;
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import org.junit.Test;
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import java.io.File;
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import java.nio.file.Files;
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import static org.junit.Assert.*;
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/**
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* Tests for {@link CentralityRadarExporter}.
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*
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* <p>Verifies construction validation, the generated HTML structure, custom
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* titles, JSON node payload integrity, XSS escaping in titles, and that
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* the file export path writes a byte-equal copy of {@link #exportToString()}.</p>
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*
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* @author sauravbhattacharya001
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*/
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public class CentralityRadarExporterTest {
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private Graph<String, Edge> graph;
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@Before
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public void setUp() {
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graph = new UndirectedSparseGraph<>();
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// Small graph: A-B-C-D with an A-C chord. 4 vertices, 4 edges.
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addEdge("A", "B");
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addEdge("B", "C");
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addEdge("C", "D");
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addEdge("A", "C");
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}
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private void addEdge(String v1, String v2) {
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if (!graph.containsVertex(v1)) graph.addVertex(v1);
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if (!graph.containsVertex(v2)) graph.addVertex(v2);
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Edge e = new Edge("f", v1, v2);
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e.setWeight(1.0f);
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graph.addEdge(e, v1, v2);
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}
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// ---------- constructor ----------
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@Test(expected = IllegalArgumentException.class)
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public void constructorRejectsNullGraph() {
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new CentralityRadarExporter(null);
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}
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@Test
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public void constructorAcceptsEmptyGraph() {
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Graph<String, Edge> empty = new UndirectedSparseGraph<>();
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CentralityRadarExporter exporter = new CentralityRadarExporter(empty);
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String html = exporter.exportToString();
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assertNotNull(html);
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// Empty graph -> "All (0)" in the topN select
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assertTrue(html.contains("All (0)"));
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// Empty DATA array
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assertTrue(html.contains("const DATA=[]"));
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}
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// ---------- HTML structure ----------
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@Test
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public void htmlContainsRequiredStructure() {
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CentralityRadarExporter exporter = new CentralityRadarExporter(graph);
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String html = exporter.exportToString();
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assertTrue("must start with DOCTYPE", html.startsWith("<!DOCTYPE html>"));
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assertTrue(html.contains("<html lang=\"en\">"));
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assertTrue(html.contains("<meta charset=\"UTF-8\">"));
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assertTrue(html.contains("<meta name=\"viewport\""));
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assertTrue(html.contains("<canvas id=\"radar\""));
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assertTrue(html.contains("id=\"rankTable\""));
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assertTrue(html.contains("id=\"search\""));
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assertTrue(html.contains("id=\"topN\""));
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assertTrue(html.contains("id=\"sortBy\""));
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assertTrue(html.contains("id=\"themeBtn\""));
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assertTrue(html.contains("id=\"stats\""));
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assertTrue("must end with closing html", html.trim().endsWith("</html>"));
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}
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@Test
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public void htmlContainsAllNodeIdsInData() {
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CentralityRadarExporter exporter = new CentralityRadarExporter(graph);
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String html = exporter.exportToString();
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// Each node id should appear inside the DATA JSON literal.
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// The exporter emits {"id":"A",...}
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for (String id : new String[]{"A", "B", "C", "D"}) {
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assertTrue("DATA payload missing node " + id,
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html.contains("\"id\":\"" + id + "\""));
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}
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// Total node count is rendered in the "All (N)" option
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assertTrue(html.contains("All (4)"));
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}
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// ---------- title customization ----------
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@Test
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public void defaultTitleIsUsedWhenNotSet() {
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CentralityRadarExporter exporter = new CentralityRadarExporter(graph);
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String html = exporter.exportToString();
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assertTrue(html.contains("<title>Centrality Radar Chart</title>"));
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}
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@Test
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public void customTitleIsHonoured() {
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CentralityRadarExporter exporter = new CentralityRadarExporter(graph);
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exporter.setTitle("My Network");
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String html = exporter.exportToString();
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assertTrue(html.contains("<title>My Network</title>"));
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}
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@Test
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public void titleIsXmlEscapedToPreventInjection() {
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CentralityRadarExporter exporter = new CentralityRadarExporter(graph);
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exporter.setTitle("<script>alert(1)</script>");
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String html = exporter.exportToString();
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// The literal <script> tag must not appear unescaped in the title slot.
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assertFalse("raw <script> must not be injected via title",
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html.contains("<title><script>alert(1)</script></title>"));
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// It should appear in escaped form (&lt; / &gt; or similar).
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assertTrue(html.contains("&lt;script&gt;") || html.contains("&lt;script"));
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}
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// ---------- file export ----------
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@Test
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public void exportWritesFileMatchingExportToString() throws Exception {
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CentralityRadarExporter exporter = new CentralityRadarExporter(graph);
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exporter.setTitle("File Export Test");
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String expected = exporter.exportToString();
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File tmp = File.createTempFile("radar-", ".html");
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try {
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exporter.export(tmp);
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String onDisk = Files.readString(tmp.toPath());
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assertEquals("file contents must match exportToString output", expected, onDisk);
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assertTrue("file should be non-trivial in size", tmp.length() > 1000);
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} finally {
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//noinspection ResultOfMethodCallIgnored
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tmp.delete();
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}
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}
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@Test(expected = NullPointerException.class)
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public void exportRejectsNullFile() throws Exception {
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new CentralityRadarExporter(graph).export(null);
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}
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}

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