Updated the tests to cover more

dbrepo-data-service/pom.xml

...src/main/java/at/tuwien/entities/container/Container.java

...va/at/tuwien/entities/container/image/ContainerImage.java

...ain/java/at/tuwien/entities/container/image/DataType.java

...ain/java/at/tuwien/entities/container/image/Operator.java

...s/src/main/java/at/tuwien/entities/database/Database.java

...main/java/at/tuwien/entities/database/DatabaseAccess.java

...ities/src/main/java/at/tuwien/entities/database/View.java

...src/main/java/at/tuwien/entities/database/ViewColumn.java

...rc/main/java/at/tuwien/entities/database/table/Table.java

...t/tuwien/entities/database/table/columns/TableColumn.java

...n/entities/database/table/columns/TableColumnConcept.java

...wien/entities/database/table/columns/TableColumnUnit.java

...ies/database/table/constraints/foreignKey/ForeignKey.java

...ase/table/constraints/foreignKey/ForeignKeyReference.java

...ies/database/table/constraints/primaryKey/PrimaryKey.java

...en/entities/database/table/constraints/unique/Unique.java

.../src/main/java/at/tuwien/entities/identifier/Creator.java

...c/main/java/at/tuwien/entities/identifier/Identifier.java

.../at/tuwien/entities/identifier/IdentifierDescription.java