[graph] Add cobertura report and increase test coverage
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Key: SANDBOX-380
URL: https://issues.apache.org/jira/browse/SANDBOX-380
Project: Commons Sandbox
Issue Type: Improvement
Components: Graph
Reporter: Marco Speranza
Priority: Minor
Increase the test coverage and add new test cases.
Each testcase should test:
1) Null input graph
2) a sparse graph
3) a complete graph
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