Add a unit test for AddedVersusDeletedLinesForensicsSeriesBuilder

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

@@ -0,0 +1,41 @@
+package io.jenkins.plugins.forensics.miner;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+class AddedVersusDeletedLinesForensicsSeriesBuilderTest {
+
+    private static final String ADDED = "added";
+    private static final String DELETED = "deleted";
+
+    @Test
+    void shouldCreateSeriesWithMockito() {
+        // Given
+        AddedVersusDeletedLinesForensicsSeriesBuilder builder = new AddedVersusDeletedLinesForensicsSeriesBuilder();
+        ForensicsBuildAction actionStub = mock(ForensicsBuildAction.class);
+        when(actionStub.getCommitStatistics()).thenReturn(createCommitStatistics(0, 0));
+
+        // When
+        Map<String, Integer> series = builder.computeSeries(actionStub);
+
+        // Then
+        assertThat(series)
+                .containsEntry(ADDED, 0)
+                .containsEntry(DELETED, 0);
+
+    }
+
+    private CommitStatistics createCommitStatistics(final int added, final int delted) {
+        List<CommitDiffItem> commits = new ArrayList<>();
+        CommitDiffItem item = new CommitDiffItem("1", "author", 1);
+        item.addLines(added).deleteLines(delted);
+        commits.add(item);
+        return new CommitStatistics(commits);
+    }
+}