add test for SummaryDataWriter

src/test/java/com/tagtraum/perf/gcviewer/exp/SummaryDataWriterTest.java

@@ -0,0 +1,76 @@
+package com.tagtraum.perf.gcviewer.exp;
+
+import static org.junit.Assert.assertThat;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import com.tagtraum.perf.gcviewer.exp.impl.SummaryDataWriter;
+import com.tagtraum.perf.gcviewer.model.AbstractGCEvent.Type;
+import com.tagtraum.perf.gcviewer.model.GCEvent;
+import com.tagtraum.perf.gcviewer.model.GCModel;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+/**
+ * Test implementation of {@link SummaryDataWriter}
+ *
+ * <p>hint: don't use memory numbers > 999, because they are not formatted the same on all platforms -&gt; unstable tests</p>
+ */
+public class SummaryDataWriterTest {
+
+    private GCModel createGcModel() throws MalformedURLException {
+        GCModel model = new GCModel();
+        model.setURL(new URL("file", "localhost", "test-file"));
+
+        model.add(new GCEvent(0.1, 996, 768, 999, 0.3, Type.GC));
+        model.add(new GCEvent(0.2, 996, 424, 997, 0.4, Type.GC));
+        model.add(new GCEvent(0.3, 612, 512, 998, 0.3, Type.GC));
+        model.add(new GCEvent(0.4, 816, 768, 999, 0.3, Type.GC));
+
+        return model;
+    }
+
+    @Test
+    public void testWriteForEmptyModel() throws IOException {
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        SummaryDataWriter objectUnderTest = new SummaryDataWriter(output);
+        GCModel model = new GCModel();
+        model.setURL(new URL("file", "localhost", "test-file"));
+
+        objectUnderTest.write(model);
+
+        String csv = output.toString();
+
+        assertThat("totalTenuredAllocMax", csv, Matchers.containsString("totalTenuredAllocMax; n/a; M"));
+    }
+
+    @Test
+    public void testWrite() throws IOException {
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        SummaryDataWriter objectUnderTest = new SummaryDataWriter(output);
+
+        objectUnderTest.write(createGcModel());
+
+        String csv = output.toString();
+
+        assertThat("totalHeapAllocMax", csv, Matchers.containsString("totalHeapAllocMax; 999; K"));
+    }
+
+    @Test
+    public void testWriteWithFullGc() throws IOException {
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        SummaryDataWriter objectUnderTest = new SummaryDataWriter(output);
+
+        GCModel model = createGcModel();
+        model.add(new GCEvent(0.5, 999, 724, 999, 0.8, Type.FULL_GC));
+
+        objectUnderTest.write(model);
+
+        String csv = output.toString();
+
+        assertThat("totalHeapAllocMax", csv, Matchers.containsString("avgfootprintAfterFullGC; 724; K"));
+    }
+}