Add unit test for CodeMetricTrendChart

src/test/java/io/jenkins/plugins/forensics/miner/CodeMetricTrendChartTest.java

@@ -0,0 +1,70 @@
+package io.jenkins.plugins.forensics.miner;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import edu.hm.hafner.echarts.Build;
+import edu.hm.hafner.echarts.BuildResult;
+import edu.hm.hafner.echarts.ChartModelConfiguration;
+import edu.hm.hafner.echarts.LinesChartModel;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * Tests the class {@link CodeMetricTrendChart}.
+ *
+ * @author Nikolas Paripovic
+ */
+class CodeMetricTrendChartTest {
+
+    @Test
+    void shouldCreate() {
+        Iterable<BuildResult<ForensicsBuildAction>> buildResults = new ArrayList<>();
+        ChartModelConfiguration chartModelConfiguration = createChartModelConfiguration();
+
+        CodeMetricTrendChart codeMetricTrendChart = new CodeMetricTrendChart();
+        LinesChartModel linesChartModel = codeMetricTrendChart.create(buildResults, chartModelConfiguration);
+
+        assertThat(linesChartModel.getSeries()).isEmpty();
+        assertThat(linesChartModel.getBuildNumbers()).isEmpty();
+        assertThat(linesChartModel.getDomainAxisLabels()).isEmpty();
+        assertThat(linesChartModel.getDomainAxisLabels()).isEmpty();
+    }
+
+    @Test
+    void shouldCreateWithData() {
+        Iterable<BuildResult<ForensicsBuildAction>> buildResults = createBuildResultsWithData();
+        ChartModelConfiguration chartModelConfiguration = createChartModelConfiguration();
+
+        CodeMetricTrendChart codeMetricTrendChart = new CodeMetricTrendChart();
+        LinesChartModel linesChartModel = codeMetricTrendChart.create(buildResults, chartModelConfiguration);
+
+        assertThat(linesChartModel.getSeries()).hasSize(2);
+        assertThat(linesChartModel.getSeries()).allSatisfy(series -> assertThat(series.getData()).hasSize(4));
+        assertThat(linesChartModel.getBuildNumbers()).hasSize(4);
+        assertThat(linesChartModel.getBuildNumbers()).containsExactly(1, 4, 7, 10);
+    }
+
+    private Iterable<BuildResult<ForensicsBuildAction>> createBuildResultsWithData() {
+        List<BuildResult<ForensicsBuildAction>> buildResults = new ArrayList<>();
+        buildResults.add(createResult(1));
+        buildResults.add(createResult(4));
+        buildResults.add(createResult(7));
+        buildResults.add(createResult(10));
+        return buildResults;
+    }
+
+    private BuildResult<ForensicsBuildAction> createResult(final int buildNumber) {
+        ForensicsBuildAction action = mock(ForensicsBuildAction.class);
+        Build build = new Build(buildNumber);
+        return new BuildResult<>(build, action);
+    }
+
+    private ChartModelConfiguration createChartModelConfiguration() {
+        return new ChartModelConfiguration();
+    }
+
+}