Sequence Step [Dido Solutions, Inc Wiki]

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Sequence Step ======

[[dido:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]

===== Discussion =====

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] is an element of a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] that references a [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]] and defines occurrence-specific information and permitted progression.

A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] is a specialization of [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence|Sequence]]. Each [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] identifies one position within the ordering or directed progression established by the Test Sequence.

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] references one [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]], such as a:

  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_set|Test Set]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_case|Test Case]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_step|Test Step]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_executable|Test Executable]]

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] can identify:

  * Its identity
  * Its name
  * Its description
  * Its position within the [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]]
  * Its referenced [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]]
  * Its applicable [[dido:99_annexes:annex-b-terms-and-definitions:t:test_argument_value|Test Argument Values]]
  * Its applicable [[dido:99_annexes:annex-b-terms-and-definitions:e:expected_result|Expected Results]]
  * Its applicable [[dido:99_annexes:annex-b-terms-and-definitions:t:test_item|Test Items]]
  * Its applicable [[dido:99_annexes:annex-b-terms-and-definitions:s:starting_condition|Starting Conditions]]
  * Its applicable [[dido:99_annexes:annex-b-terms-and-definitions:t:timing_condition|Timing Conditions]]
  * Its required prior conditions
  * Its completion condition
  * Its failure condition
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:t:timeout|Timeout]]
  * Its permitted following [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Steps]]
  * Its progression conditions
  * Its alternative progression
  * Its error-handling progression
  * Its applicable [[dido:99_annexes:annex-b-terms-and-definitions:g:governance_policy|Governance Policies]]
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]]

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] can supply occurrence-specific Test Argument Values to the referenced [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]].

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] can also identify one or more permitted following [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Steps]]. Progression can depend on:

  * Completion of the current [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_result|Test Result]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:v:verdict|Verdict]]
  * A measured value
  * An observed event
  * A state
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:timeout|Timeout]]
  * An error
  * Another defined progression condition

The [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] defines permitted progression. The applicable [[dido:99_annexes:annex-b-terms-and-definitions:e:execution_path|Execution Path]] identifies the progression that actually occurs during [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]].

===== Definition =====

//element of a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] that references a [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]] and defines occurrence-specific information and permitted progression//

===== Source =====

Adapted from:

  * [[https://www.omg.org/spec/TestIF/1.0/Beta3/PDF|OMG Test Information Interchange Format (TestIF), Version 1.0 Beta 3, Section 7.3.4, SequenceStep]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence|Sequence]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_argument_value|Test Argument Value]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:e:execution_path|Execution Path]]
  * DIDO Reference Implementation Conceptual Model
  * DIDO-TE draft Requirements Register

OMG TestIF defines SequenceStep as a directed-graph node contained within a TestSequence. The SequenceStep references the SequencedTestObject represented at that position and identifies the SequenceSteps that can follow it.

OMG TestIF also permits a SequenceStep to provide ArgumentValues for the input variables of its referenced SequencedTestObject.

This definition preserves those characteristics while:

  * Defining [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] as an element of a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]]
  * Relating [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] to the general concept of [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence|Sequence]]
  * Separating permitted progression from the [[dido:99_annexes:annex-b-terms-and-definitions:e:execution_path|Execution Path]] that actually occurs
  * Remaining independent of a particular graph-storage or implementation technology

===== Note =====

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] differs from a [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence|Sequence]]:

  * A Sequence defines an ordered or directed arrangement of elements and the progression relationships among them
  * A Sequence Step is one element within a Test Sequence

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] differs from a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]]:

  * A Test Sequence defines the overall ordering and permitted progression
  * A Sequence Step identifies one position and defined occurrence within that progression

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] differs from a [[dido:99_annexes:annex-b-terms-and-definitions:t:test_step|Test Step]]:

  * A Test Step specifies a reusable test action or [[dido:99_annexes:annex-b-terms-and-definitions:v:validation|Validation]]
  * A Sequence Step identifies an occurrence of a Sequenced Test Object within a Test Sequence

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] can reference a Test Step, but the Sequence Step and Test Step remain separate TestIF objects.

The same Test Step can occur at multiple positions within one [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]]. Each occurrence uses a separate [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]].

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] differs from a [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]]:

  * A Sequenced Test Object defines reusable test content
  * A Sequence Step identifies how that content participates at one position within a Test Sequence

The same [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]] can participate in:

  * Multiple [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequences]]
  * Multiple positions within one Test Sequence
  * Multiple branches within one Test Sequence
  * Multiple [[dido:99_annexes:annex-b-terms-and-definitions:t:test_run|Test Runs]]

Each [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] can provide different:

  * Test Argument Values
  * Expected Results
  * Starting Conditions
  * Timing Conditions
  * Progression conditions
  * Error-handling progression
  * Other occurrence-specific information

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] does not copy or redefine the referenced [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]]. It supplies or references the information needed to use that object at a particular position.

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] differs from an [[dido:99_annexes:annex-b-terms-and-definitions:e:execution_path|Execution Path]]:

  * A Sequence Step defines a potential occurrence and permitted progression within a Test Sequence
  * An Execution Path identifies which Sequence Steps occurred and how progression actually proceeded during Test Execution

A [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] can remain unperformed when:

  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]] follows another conditional branch
  * A preceding Sequence Step fails
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:timeout|Timeout]] causes error-handling progression
  * Test Execution terminates before reaching the Sequence Step
  * An authorized [[dido:99_annexes:annex-b-terms-and-definitions:a:actor|Actor]] cancels the Test Run

Multiple initial [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Steps]] can define parallel starting paths.

Multiple following [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Steps]] can define:

  * Parallel progression
  * Conditional progression
  * Alternative progression
  * Error-handling progression

The [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] provides sufficient progression information to distinguish parallel progression from conditional or alternative progression.

A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_result|Test Result]] can reference both:

  * The [[dido:99_annexes:annex-b-terms-and-definitions:s:sequenced_test_object|Sequenced Test Object]] whose performance produced the outcome
  * The [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] that identifies the particular occurrence of that Sequenced Test Object

This dual reference distinguishes Test Results produced by separate occurrences of the same Sequenced Test Object.

===== Example =====

A reusable [[dido:99_annexes:annex-b-terms-and-definitions:t:test_step|Test Step]] submits a proposed transaction to a [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]].

A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_sequence|Test Sequence]] contains three [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Steps]] that reference the same Test Step:

  * Sequence Step ''SS-01'' supplies the [[dido:99_annexes:annex-b-terms-and-definitions:e:endpoint|Endpoint]] and identity of Node A
  * Sequence Step ''SS-02'' supplies the Endpoint and identity of Node B
  * Sequence Step ''SS-03'' supplies the Endpoint and identity of Node C

Each [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Step]] supplies occurrence-specific [[dido:99_annexes:annex-b-terms-and-definitions:t:test_argument_value|Test Argument Values]] while reusing the same Test Step.

During [[dido:99_annexes:annex-b-terms-and-definitions:t:test_execution|Test Execution]], the [[dido:99_annexes:annex-b-terms-and-definitions:t:test_run|Test Run]] records:

  * Whether each Sequence Step occurred
  * The Test Argument Values used for each occurrence
  * The Starting Conditions applicable to each occurrence
  * The Timing Conditions applicable to each occurrence
  * The start time and completion time of each occurrence
  * The Test Result produced by each occurrence
  * The Verdict assigned to each Test Result
  * The [[dido:99_annexes:annex-b-terms-and-definitions:e:execution_path|Execution Path]] followed
  * The supporting [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]

Although all three [[dido:99_annexes:annex-b-terms-and-definitions:s:sequence_step|Sequence Steps]] reference the same [[dido:99_annexes:annex-b-terms-and-definitions:t:test_step|Test Step]], each Test Result remains traceable to the particular Node and Sequence Step that produced it.

----

<WRAP centeralign>
© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
</WRAP>