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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV
+
+=========================
+Stress Test Specification
+=========================
+
+.. toctree::
+   :maxdepth: 2
+
+Scope
+=====
+
+The stress test involves testing and verifying the ability of the SUT to withstand
+stress and other challenging factors. Main purpose behind the testing is to make sure
+the SUT is able to absorb failures while providing an acceptable level of service.
+
+
+References
+================
+
+This test area references the following specifications, definitions and reviews:
+
+- Upstream OpenStack NOVA Resiliency
+
+  - https://wiki.openstack.org/wiki/NovaResiliency
+
+- Stress Testing over OPNFV Platform
+
+  - https://wiki.opnfv.org/display/bottlenecks/Stress+Testing+over+OPNFV+Platform
+
+
+Definitions and Abbreviations
+=============================
+
+The following terms and abbreviations are used in conjunction with this test area
+
+- iff - if and only if
+- NFVI - Network Functions Virtualization Infrastructure
+- NaN - Not a Number
+- Service Level - Measurable terms that describe the quality of the service provided by the SUT within a given time period
+- SUT - System Under Test
+- VM - Virtual Machine
+
+
+System Under Test (SUT)
+=======================
+
+The system under test is assumed to be the NFVI and VIM in operation on a
+Pharos compliant infrastructure.
+
+
+Test Area Structure
+====================
+
+According to the testing goals stated in the test scope section,
+preceding test will not affect the subsequent test
+as long as the SUT is able to sustain the given stress
+while providing an acceptable level of service.
+Any FAIL result from a single test case will cause the SUT failing the whole test.
+
+
+Test Descriptions
+=================
+
+----------------------------------------------------------------
+Test Case 1 - Concurrent capacity based on life-cycle ping test
+----------------------------------------------------------------
+
+Short name
+----------
+
+dovetail.stress.ping
+
+Use case specification
+----------------------
+
+This test case verifies the ability of the SUT concurrently setting up VM pairs
+for different tenants (through different OpenStack related components) and
+providing acceptable capacity under stressful conditions. The connectivity between
+VMs in a VM pair for a tenant is validated through Ping test. A life-cycle event
+in this test case is particularly referred to a VM pair life-cycle consisting of
+spawning, pinging and destroying.
+
+Test preconditions
+------------------
+
+* heat_template_version: 2013-05-23
+* ElasticSearch Port: 9200
+* LogStash Port: 5044
+* Kibana Port: 5601
+* Yardstick Port: 5000
+
+Basic test flow execution description and pass/fail criteria
+------------------------------------------------------------
+
+Methodology for validating capacity of the SUT
+'''''''''''''''''''''''''''''''''''''''''''''
+Validating capacity of the SUT based on life-cycle ping test generally involves
+2 subtests which provides secondary validation for the SUT furnishing users with
+reliable capacity without being crushed.
+
+Let *N1*, *N2*, *N3* and *P1* be certain preset numbers, respectively.
+In subtest 1, the SUT concurrently setting up *N1* VM pairs with each VM pair
+belonging to a different tenant. Then VM1 in a VM pair pings VM2 for *P1* times
+with *P1* packets. The connectivity could be validated iff VM1 successfully pings
+VM2 with these *P1* packets.
+Subtest 1 is finished iff all the concurrent (*N1*) requests for creating VM pairs
+are fulfilled with returned values that indicate the statuses of the VM pairs creations.
+
+Subtest 2 is executed after subtest 1 as secondary validation of the capacity.
+It follows the same workflow as subtest 1 does to set up *N2* VM pairs.
+
+Assume *S1* and *S2* be the numbers of VM pairs that are successfully created in
+subtest 1 and subtest 2, respectively. If *min(S1,S2)>=N3*, then the SUT is considered as PASS.
+Otherwise, we denote the SUT with FAIL.
+
+Note that for subtest 1, if the number of successfully created VM pairs, i.e., *S1*,
+is smaller than *N3*. Subtest 2 will not be executed and SUT will be marked with FAIL.
+
+Test execution
+''''''''''''''
+* Test action 1: Install the testing tools by pulling and running the Bottlenecks Docker container
+* Test action 2: Prepare the test by sourcing openstack credential file,
+  eliminating the environment constraints, i.e., Quota setting, setting up
+  Yardstick docker, pulling and registering OS images and VM flavor
+* Test action 3: Call Yardstick to concurrently creating *N1* VM pairs for N1 tenants
+* Test action 4: In each VM pair, VM1 pings VM2 for *P1* times with *P1* packets while recording the successful numbers
+* Test action 5: Mark the VM pairs with *P1* successful pings as PASS and record the total number of PASS VM pairs as *S1*
+* Test action 6: Destroy all the VM pairs
+* Test action 7: If *S1<N3*, the SUT is marked with FAIL and the test return. Otherwise go to *Test action 8*
+* Test action 8: Go to *Test action 3* and do the test again to create *N2* VM pairs with PASS VM pairs counted as *S2*
+* Test action 9: If *S2<N3*, the SUT is marked with FAIL. Otherwise marked with PASS.
+
+Pass / fail criteria
+''''''''''''''''''''
+
+Typical setting of *(N1, N2, N3, P1)* is *(5, 5, 5, 10)*.
+The reference setting above is acquired based on the results from OPNFV CI jobs
+and testing over commercial products.
+
+The connectivity within a VM pair is validated iff:
+
+* VM1 successfully pings VM2 for *P1* times with *P1* packets
+
+The SUT is considered passing the test iff:
+
+* *min(S1,S2)>=N3*
+
+Note that after each subtest, the program will check if the successfully created number of VM pairs
+is smaller than *N3*. If true, the program will return and the SUT will be marked with FAIL.
+Then the passing criteria is equal to the equation above. When subtest 1 returns, *S2* here is denoted
+by NaN.
+
+Post conditions
+---------------
+
+N/A