ETSI TR 103 119 V1.1.1 (2018-02)

Methods for Testing and Specification (MTS); The Test Description Language (TDL); Reference Implementation

DTR/MTS-103119REFv1.1.1

General Information

• Status: Published
• Publication Date: 31-Jan-2018
• Technical Committee: MTS - Methods for Testing & Specification
• Current Stage: 12 - Completion
• Due Date: 30-Jan-2018
• Completion Date: 01-Feb-2018

Standards Content (Sample)

ETSI TR 103 119 V1.1.1 (2018-02)






TECHNICAL REPORT
Methods for Testing and Specification (MTS);
The Test Description Language (TDL);
Reference Implementation

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2 ETSI TR 103 119 V1.1.1 (2018-02)



Reference
DTR/MTS-103119REFV1.1.1
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GSM® and the GSM logo are trademarks registered and owned by the GSM Association.
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3 ETSI TR 103 119 V1.1.1 (2018-02)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 7
4 Basic Principles . 7
4.1 Introduction . 7
4.2 Implementation Scope . 7
4.3 Document Structure . 8
5 Graphical Representation Viewer . 8
5.1 Scope and Requirements . 8
5.2 Architecture and Technology Foundation . 9
5.2.1 Diagram Viewer . 9
5.2.2 Structured Test Objective Representatio n . 10
5.3 Implemented Facilities . 11
5.3.1 Creating Models . 11
5.3.2 Viewing Models . 15
5.3.3 Exporting Structured Test Objectives . 23
5.3.4 Validating Models . 25
5.4 Usage Instructions . 26
5.4.1 Development Environment . 26
5.4.2 End-user Instructions . 27
6 UML Profile Editor . 28
6.1 Architecture and Technology Foundation . 28
6.2 Implemented Facilities . 28
6.2.1 Applying the Profile. 28
6.2.2 Hints for the Transforming UP4TDL Models into TDL Models . 29
6.2.3 Editing models with the Model Explorer . 30
6.2.4 Editing models with TDL-specific properties from the 'TDL property view' . 30
6.2.5 Editing models with TDL-specific diagrams . 30
Annex A (informative): Technical Realization of the Reference Implementation. 35
History . 36


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4 ETSI TR 103 119 V1.1.1 (2018-02)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee Methods for Testing and Specification
(MTS).
TM TM TM TM TM TM TM TM
NOTE: Eclipse , Xtext , Sirius , EMF , Papyrus , GMF , Epsilon , EVL are the trade names of a
TM TM TM TM
product supplied by the Eclipse Foundation. OMG®, XMI , UML , OCL , MOF are the trade
names of a product supplied by Object Management Group®. This information is given for the
convenience of users of the present document and does not constitute an endorsement by ETSI of the
product named.
The present document is complementary to the multi-part deliverable covering the Test Description Language as
identified below:
ETSI ES 203 119-1: "Abstract Syntax and Associated Semantics";
ETSI ES 203 119-2: "Graphical Syntax";
ETSI ES 203 119-3: "Exchange Format";
ETSI ES 203 119-4: "Structured Test Objective Specification (Extension)".
Modal verbs terminology
In the present document "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be
interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

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5 ETSI TR 103 119 V1.1.1 (2018-02)
1 Scope
The present document summarizes technical aspects related to the reference implementation of TDL. It describes both
the implementation details needed for further development and integration of the tools as well as gives usage
instructions for end users.
Following tools and components are covered in the present document:
• implementation of the TDL meta-model;
• viewer for the graphical representation format of TDL;
• various TDL model editors;
• facilities for checking the semantic validity of models according to the constraints specified in the TDL meta-
model;
• implementation of the UML profile for TDL; and
• editor supporting the creation and manipulation of UML models applying the UML profile for TDL.
2 References
2.1 Normative references
Normative references are not applicable in the present document.
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
TM
[i.1] Eclipse Foundation : Eclipse IDE Website (last visited 30.03.2016).
NOTE: Available at https://eclipse.org.
TM TM
[i.2] Eclipse Foundation : Eclipse Xtext Website (last visited 30.03.2016).
NOTE: Available at https://eclipse.org/Xtext/index.html.
TM TM
[i.3] Eclipse Foundation : Eclipse Sirius Website (last visited 30.03.2016).
NOTE: Available at http://www.eclipse.org/sirius/index.html.
TM TM
[i.4] Eclipse Foundation : Eclipse Modeling Framework (EMF ) Website (last visited 30.03.2016).
NOTE: Available at http://www.eclipse.org/modeling/emf/.
TM TM
[i.5] Eclipse Foundation : Eclipse Papyrus Modeling Environment Website (last visited
30.03.2016).
NOTE: Available at https://www.eclipse.org/papyrus/.
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6 ETSI TR 103 119 V1.1.1 (2018-02)
TM TM
[i.6] Eclipse Foundation : UML Profiles Repository Website (last visited 30.03.2016).
NOTE: Available at https://projects.eclipse.org/projects/modeling.upr.
TM TM
[i.7] Eclipse Foundation : Graphical Modeling Framework (GMF ) Website (last visited
30.03.2016).
NOTE: Available at http://www.eclipse.org/modeling/gmp/.
TM
[i.8] "Object Constraint LanguageTM (OMG® OCL ), Version 2.4", formal/2014-02-03.
NOTE: Available at http://www.omg.org/spec/OCL/2.4/.
TM TM
[i.9] Eclipse Foundation : Eclipse OCL Website (last visited 30.03.2016).
NOTE: Available at https://projects.eclipse.org/projects/modeling.mdt.ocl.
[i.10] Plutext Pty Ltd: Docx4j Website (last visited 30.03.2016).
NOTE: Available at http://www.docx4java.org/trac/docx4j.
TM TM
[i.11] "OMG® XML Metadata Interchange (XMI ) Specification", Version 2.4.2, formal/
2014-04-04.
NOTE: Available at http://www.omg.org/spec/MOF/2.4.2/.
TM TM TM
[i.12] Eclipse Foundation : Epsilon Validation Language (EVL ) Website (last visited 30.03.2016).
NOTE: Available at http://www.eclipse.org/epsilon/doc/evl/.
[i.13] ETSI ES 203 119-1 (V1.3.1): "Methods for Testing and Specification (MTS); The Test
Description Language (TDL); Part 1: Abstract Syntax and Associated Semantics".
[i.14] ETSI ES 203 119-2 (V1.2.1): "Methods for Testing and Specification (MTS); The Test
Description Language (TDL); Part 2: Graphical Syntax".
[i.15] ETSI ES 203 119-3 (V1.2.1): "Methods for Testing and Specification (MTS); The Test
Description Language (TDL); Part 3: Exchange Format".
[i.16] ETSI ES 203 119-4 (V1.2.1): "Methods for Testing and Specification (MTS); The Test
Description Language (TDL); Part 4: Structured Test Objective Specification (Extension)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
abstract syntax: graph structure representing a TDL specification in an independent form of any particular encoding
concrete syntax: particular representation of a TDL specification, encoded in a textual, graphical, tabular or any other
format suitable for the users of this language
meta-model: modelling elements representing the abstract syntax of a language
system under test (SUT): role of a component within a test configuration whose behaviour is validated when executing
a test description
TDL model: instance of the TDL meta-model
TDL specification: representation of a TDL model given in a concrete syntax
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3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
API Application Programming Interface
EBNF Extended Backus-Naur Form
EMF Eclipse Modelling Framework
EVL Epsilon Validation Language
GMF Graphical Modelling Framework
MBT Model-Based Testing
MOF Meta-Object Facility
OCL Object Constraint Language
OMG Object Management Group®
SUT System Under Test
TDL Test Description Language
UML Unified Modelling Language
URI Unified Resource Identifier
XMI XML Metadata Interchange
XML eXtensible Markup Language
4 Basic Principles
4.1 Introduction
To accelerate the adoption of TDL, a reference implementation of TDL is provided in order to lower the barrier to entry
for both users and tool vendors in getting started with using TDL. The reference implementation comprises graphical
and textual editors, as well as validation facilities. In addition, the UML profile for TDL and supporting editing
facilities are implemented in order to enable application of TDL in UML-based working environments and model-based
testing approaches.
4.2 Implementation Scope
The implementation scope includes a graphical viewer according to ETSI ES 203 119-2 [i.14] based on the Eclipse
platform [i.1] and related technologies, covering essential constructs related to test configurations and test behaviour
specification. For creating and manipulating models, a textual editor for ETSI ES 203 119-1 [i.13], annex B is
implemented based on the Eclipse platform and related technologies. The applicability of general purpose model editing
facilities provided by the Eclipse platform and related technologies is discussed.
For tools that need to import and export TDL models according to ETSI ES 203 119-3 [i.15], corresponding facilities
are implemented based on the Eclipse platform and related technologies. These facilities can be used to transform
textual representations based on ETSI ES 203 119-1 [i.13] into XMI [i.11] serializations according to ETSI
ES 203 119-3 [i.15] and can be integrated in custom tooling that builds on the Eclipse platform.
An implementation of ETSI ES 203 119-4 [i.16] includes a dedicated textual editor for structured test objectives, which
can be integrated in the textual editor for TDL. The implementation also includes facilities for exporting structured test
objectives to Word documents using customisable tabular templates.
An implementation of the UML profile for TDL includes a specification of the TDL UML profile abstract syntax
according to the mapping from the TDL meta-model to TDL stereotypes and UML meta-classes in ETSI
ES 203 119-1 [i.13], annex C. It is integrated with the open source UML modelling environment Eclipse Papyrus [i.5]
as an open TDL UML profile reference implementation platform. It will be published on the open source "Eclipse UML
Profiles Repository" project [i.6].
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Figure 4.2.1: TDL tool infrastructure
An overview of the context of the reference implementation is shown in Figure 4.2.1. The TDL exchange format
specified in ETSI ES 203 119-3 [i.15] serves as a bridge between the different tool components. Textual editors enable
the creation and manipulation of TDL models. The graphical viewer is used to visualize TDL models as diagrams.
Documentation generation, in particular for structured test objectives, can be plugged in to produce Word documents
for presenting parts of a TDL model in a format suitable for standardization documents.
The complete implementation will be published on an open-source portal serving as a central hub for the TDL
community.
4.3 Document Structure
The present document contains two main technical clauses focusing on relevant technical details. The Graphical
Representation Viewer implementing ETSI ES 203 119-2 [i.14], as well as related facilities implementing ETSI
ES 203 119-1 [i.13], ETSI ES 203 119-3 [i.15] and ETSI ES 203 119-4 [i.16] are described in clause 5. The UML
Profile Editor implementing annex C of ETSI ES 203 119-1 [i.13] is described in clause 6.
5 Graphical Representation Viewer
5.1 Scope and Requirements
TDL graphical viewer implementation has two major requirements. The main objective is to provide means to visualize
TDL models according to the graphical notation. The second objective is to facilitate layout of diagrams in a way that is
suitable for documentation. For the second purpose, it is essential to provide graphical editing capabilities. Although
often provided by modelling frameworks, the ability to graphically edit the underlying models (that is, to create new
elements and set their properties) is not considered relevant for this implementation.
Eclipse provides several graphical modelling tools to help build editors. Sirius [i.3] was chosen for its declarative
approach that provides separation between meta-model mappings and implementations of graphical elements. With the
existence of predefined common graphical elements such as containers and connectors, the effort of implementing
graphical editor with custom syntax in Sirius is only spent on the parts that diverge from those common elements.
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Another area that requires custom implementation is the layout of graphical elements. This covers both the absolute
placement of nodes on the diagram as well as the size and internal contents of each node. Due to rather hierarchical
nature of the TDL graphical syntax, several additional base graphical elements are introduced. Some peculiar
limitations of Sirius have also been identified prior to the implementation, which also need appropriate workarounds.
The goal of implementing diagram layout is to automate diagram creation to the extent that the sizes and contents of
graphical elements are adjusted by layout algorithms while the absolute placement of diagram elements is solved by
using built in layout implementations. This will guarantee minimal user interaction with diagram editor for achieving
desired layouts.
Diagram export for documentation purposes is provided by the framework. The viewer implementation will add
complimentary export to Word document format.
Due to the peculiarities and intended use of structured test objectives, it was determined that instead of graphical shapes
that can be exported as images, the graphical representation are realized as tables exported in a Word document
according to user-defined templates. These tables can then be manipulated further as necessary to fit in within an
existing document.
5.2 Architecture and Technology Foundation
5.2.1 Diagram Viewer
TDL viewer is built on Eclipse platform to benefit from its wide range of modelling tools. The main Eclipse projects
that are used as basis for this implementation are shown in Figure 5.2.1. Sirius is a technology that allows declarative
creation of graphical editors that work with EMF models. It uses GMF [i.7] to create visual diagram elements and link
those to model objects. Model management and serialization is done by EMF [i.4].
Eclipse platform
EMF
TDL (XF)
TDL Ecore
Sirius
Diagram
Diagram
specification
GMF
TDL viewer
Image

NOTE: Components with grey background are part of the implementation that is covered by the present
document.

Figure 5.2.1: Dependencies and data flows of TDL viewer
Every EMF model is based on a meta-model that is defined in terms of meta-modelling system named Ecore. TDL
meta-model in UML format was converted to Ecore meta-model (TDL Ecore) using Papyrus UML and EMF facilities.
Furthermore, Java code for the TDL meta-model was generated based on the TDL meta-model.
Sirius creates diagram editors by interpreting diagram specification files. These files contain TDL meta-model
references in the form of Java or OCL [i.8] queries. OCL support is provided by the Eclipse OCL project [i.9], Java
queries are references to classes that are part of the TDL viewer source code. Diagram specifications also contain
definitions of Sirius specific styles that are applied to model objects when rendering them on diagrams. Since the TDL
viewer requires customized shapes, it has dependencies on both the Sirius API and the Eclipse GMF. Several extensions
to GMF classes have been implemented in Sirius in order to configure shapes according to the customized styles. GMF
facilities are then used to export diagrams as images.
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Some of the labels in the graphical shapes, in particular labels related to data specification and data use have a complex
structure. For their realization, facilities provided by Xtext [i.2] are used to serialize model fragments related to data use
as text according to an annotated EBNF grammar derived from the formal label specifications in ETSI
ES 203 119-2 [i.14].
5.2.2 Structured Test Objective Representation
Structured test objectives are exported as tables in a Word document according to user-defined templates. The export
relies on facilities provided by Xtext as well as the Docx4j library [i.10] providing API for manipulating Word
documents. The exporting facilities take a Word document containing one or more templates in the form of tables with
placeholders and a TDL model containing one or more structured test objectives as input. The user has to provide the
name of the desired template as an additional input. For every structured test objective, the selected template is copied
into a new empty document and the placeholders are replaced by the content serialized from the corresponding TDL
element according to the Xtext mappings in a similar manner as the labels for the diagram viewer. The representation
process is sketched on Figure 5.2.2. The generated tables in the new Word document can be further manipulated or
merged into an existing document containing additional information. Additional templates may be defined by users to
suit specific needs.

Figure 5.2.2: Structured test objective representation process
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11 ETSI TR 103 119 V1.1.1 (2018-02)
5.3 Implemented Facilities
5.3.1 Creating Models
Overview
Model instances are the primary artefacts for TDL. They carry the semantic information. In a modelling environment
there are various means for creating, viewing, and manipulating model instances of a particular meta-model.
Comprehensive modelling environments typically provide generic model facilities that enable working with model
instances of arbitrary meta-models, provided the meta-model is known. Generic model facilities provide sufficient
capabilities for performing basic tasks on model instances. However, due to their generic nature, they are cumbersome
to work with, lack of support for certain features that are not expressed in the meta-model directly (unless customized),
and do not provide domain-specific features such as syntactical customization beyond basic adaptations.
Custom syntax implementations address some of the shortcomings of generic model editors. Such implementations
enable the specification of a customized representation of a model instance in a format that is tailored to a specific
group of users. There may be multiple custom syntax implementations mapped to the same meta-model, serving
different stakeholders or even different purposes for the same stakeholder. Custom syntax implementations may cover
only a subset of the meta-model, restricting the access to certain features that are not relevant for specific stakeholders
or purposes. Modelling environments provide platforms for the realization of custom syntax implementations. Custom
syntax implementations may rely on secondary artefacts that store the concrete representation of the TDL model
instance.
TDL model instances may be produced automatically by tools. The exchange format for TDL enables the
interoperability of tools producing model instances and tools for manipulating model instances.
Generic Model Editors
The EMF provides facilities for generating basic tree editors for a given meta-model, which can then be customized to
an extent while still remaining within the tree editor paradigm. In addition, the EMF also provides generic reflective
model editors which provide quick access to model instances of any meta-model. An example of such an editor for TDL
is shown in Figure 5.3.1. The example includes a tree-based editor for manipulating the overall structure of a model on
top and a detailed property view for manipulating individual properties on the bottom.
Extensions to the EMF such as MoDisco include additional generic facilities such as the MoDisco model browser which
provides faceted browsing and editing of model instances. Faceted browsing provides filtering by type, as well as deep
navigation across references. In addition, MoDisco also includes tabular views on different parts of the model for a
quick overview across multiple dimensions. An example for a TDL model is illustrated in Figure 5.3.2. The example
includes a faceted browser on the top for navigating and manipulating the overall structure of a model, as well as
individual properties of model elements. On the left side of the faceted browser, model elements can be filtered by type.
Below the faceted browser, a tabular viewer provides more compact representation of multiple model elements at the
same level in a model tree, such as the behaviour elements of a block. The property view on the bottom part of the
example still allows the manipulation of properties of selected model elements.
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Figure 5.3.1: Example of r
...