Added a missing dependency

dhp-schemas/pom.xml

@@ -31,6 +31,12 @@
             <artifactId>jackson-databind</artifactId>
         </dependency>
         
+         <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>eu.dnetlib.dhp</groupId>
             <artifactId>dhp-common</artifactId>

dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Relation.java

@@ -1,12 +1,12 @@
 package eu.dnetlib.dhp.schema.oaf;
 
-import org.junit.Assert;
-
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.junit.Assert;
+
 public class Relation extends Oaf {
 
 	private String relType;
@@ -25,7 +25,7 @@ public class Relation extends Oaf {
 		return relType;
 	}
 
-    public void setRelType(String relType) {
+	public void setRelType(final String relType) {
 		this.relType = relType;
 	}
 
@@ -33,7 +33,7 @@ public class Relation extends Oaf {
 		return subRelType;
 	}
 
-    public void setSubRelType(String subRelType) {
+	public void setSubRelType(final String subRelType) {
 		this.subRelType = subRelType;
 	}
 
@@ -41,7 +41,7 @@ public class Relation extends Oaf {
 		return relClass;
 	}
 
-    public void setRelClass(String relClass) {
+	public void setRelClass(final String relClass) {
 		this.relClass = relClass;
 	}
 
@@ -49,7 +49,7 @@ public class Relation extends Oaf {
 		return source;
 	}
 
-    public void setSource(String source) {
+	public void setSource(final String source) {
 		this.source = source;
 	}
 
@@ -57,7 +57,7 @@ public class Relation extends Oaf {
 		return target;
 	}
 
-    public void setTarget(String target) {
+	public void setTarget(final String target) {
 		this.target = target;
 	}
 
@@ -65,7 +65,7 @@ public class Relation extends Oaf {
 		return collectedFrom;
 	}
 
-    public void setCollectedFrom(List<KeyValue> collectedFrom) {
+	public void setCollectedFrom(final List<KeyValue> collectedFrom) {
 		this.collectedFrom = collectedFrom;
 	}
 
@@ -75,10 +75,7 @@ public class Relation extends Oaf {
 		Assert.assertEquals("relType(s) must be equal", getRelType(), r.getRelType());
 		Assert.assertEquals("subRelType(s) must be equal", getSubRelType(), r.getSubRelType());
 		Assert.assertEquals("relClass(es) must be equal", getRelClass(), r.getRelClass());
-        setCollectedFrom(
+		setCollectedFrom(Stream.concat(getCollectedFrom().stream(), r.getCollectedFrom().stream())
-            Stream.concat(
-                    getCollectedFrom().stream(),
-                    r.getCollectedFrom().stream())
 				.distinct() // relies on KeyValue.equals
 				.collect(Collectors.toList()));
 	}

pom.xml

@@ -76,7 +76,7 @@
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.12</version>
+			<version>${junit.version}</version>
 			<scope>test</scope>
 		</dependency>
 
@@ -481,6 +481,7 @@
 		<dhp.jackson.version>2.9.6</dhp.jackson.version>
 		<dhp.commons.lang.version>3.5</dhp.commons.lang.version>
 		<scala.version>2.11.12</scala.version>
+		<junit.version>4.12</junit.version>
 		<mongodb.driver.version>3.4.2</mongodb.driver.version>
 	</properties>
 </project>