Make sure we have data sources defined

Author: egonw

org.bridgedb.bio/src/test/java/org/bridgedb/bio/DataSourceTxtTest.java

@@ -33,6 +33,7 @@
 import java.util.Set;
 
 import org.bridgedb.DataSource;
+import org.junit.jupiter.api.BeforeAll;
 
 
 /**
@@ -41,6 +42,11 @@
  */
 public class DataSourceTxtTest {
 
+	@BeforeAll
+	public static void setUpSources() {
+		if (DataSource.getDataSources().size() < 20) DataSourceTxt.init();
+	}
+
 	@org.junit.jupiter.api.Test
 	public void testUniqueSystemCodes() {
 		Set<String> codes = new HashSet<String>();