Add a unit test for RelativeCountCommitStatisticsSeriesBuilder

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

@@ -0,0 +1,41 @@
+package io.jenkins.plugins.forensics.miner;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import static io.jenkins.plugins.forensics.miner.RelativeCountForensicsSeriesBuilder.*;
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+class RelativeCountCommitStatisticsSeriesBuilderTest {
+    @Test
+    void computeSeries() {
+        final int commitCount = 7;
+        final int authorCount = 7;
+        final int filesCount = 7;
+
+        RelativeCountCommitStatisticsSeriesBuilder relativeCountCommitStatisticsSeriesBuilder = new RelativeCountCommitStatisticsSeriesBuilder();
+        CommitStatisticsBuildAction commitStatisticsBuildActionStub = getCommitStatisticsBuildActionStub(
+                commitCount, authorCount, filesCount);
+        Map<String, Integer> result = relativeCountCommitStatisticsSeriesBuilder.computeSeries(
+                commitStatisticsBuildActionStub);
+
+        assertThat(result)
+                .containsEntry(COMMITS_KEY, commitCount)
+                .containsEntry(AUTHORS_KEY, authorCount)
+                .containsEntry(FILES_KEY, filesCount);
+    }
+
+    private CommitStatisticsBuildAction getCommitStatisticsBuildActionStub(final int commitCount, final int authorCount,
+            final int filesCount) {
+        CommitStatisticsBuildAction commitStatisticsBuildActionStub = mock(CommitStatisticsBuildAction.class);
+        CommitStatistics commitStatistics = mock(CommitStatistics.class);
+        when(commitStatisticsBuildActionStub.getCommitStatistics()).thenReturn(commitStatistics);
+        when(commitStatistics.getCommitCount()).thenReturn(commitCount);
+        when(commitStatistics.getAuthorCount()).thenReturn(authorCount);
+        when(commitStatistics.getFilesCount()).thenReturn(filesCount);
+        return commitStatisticsBuildActionStub;
+    }
+}
+