slapos-sr-testing: Add instance parameters to filter what is tested

The two following instance parameters now exist:
- `only-sr`: a list of software releases names to test
- `unittest-args`: a list of arguments for unittest

By default:
- all software releases are tested
- the unittest arguments are ["discover", "-v"]

Single values are accepted even if they are not in a list.

software/slapos-sr-testing/buildout.hash.cfg

@@ -15,4 +15,4 @@
 
 [template]
 filename = instance.cfg
-md5sum = 5d1320a9b1d2828f2870e3096f1c2bfb
+md5sum = 733643122fb75dfd7374b973a95fa2ea

software/slapos-sr-testing/instance.cfg

@@ -4,7 +4,7 @@ parts +=
   publish
 
 [slap-configuration]
-recipe = slapos.cookbook:slapconfiguration
+recipe = slapos.cookbook:slapconfiguration.serialised
 computer = ${slap-connection:computer-id}
 partition = ${slap-connection:partition-id}
 url = ${slap-connection:server-url}
@@ -40,15 +40,34 @@ template = inline:
 recipe = slapos.recipe.template:jinja2
 rendered = ${:workdir}/.nxdtest
 workdir = ${directory:nxdtest-working-dir}
-template = inline:
-  {% for test in tests.splitlines() %}
-    TestCase(
-      {{ repr(test.split()[0]) }},
-      [ {{ repr(interpreter) }}, '-m', 'unittest', 'discover', '-v'],
-      cwd={{ repr(test.split()[1]) }},
-      summaryf=UnitTest.summary,
-    )
-  {% endfor %}
+tests = {{ tests | indent(2) }}
+template =
+  inline:{% raw %}
+  {%- set only_sr = slapparameter_dict.get('only-sr') %}
+  {%- if not isinstance(only_sr, list) %}
+  {%-   set only_sr = [only_sr] %}
+  {%- endif %}
+  {%- set unittest_args = slapparameter_dict.get('unittest-args', ['discover', '-v']) %}
+  {%- if not isinstance(unittest_args, list) %}
+  {%-   set unittest_args = [unittest_args] %}
+  {%- endif %}
+  command = {{ repr([interpreter, '-m', 'unittest'] + unittest_args) }}
+  {%- for test in tests.splitlines() %}
+  {%-   set name, folder = test.split() %}
+  {%-   if not only_sr or name in only_sr %}
+  TestCase(
+    {{ repr(name) }},
+    command,
+    cwd={{ repr(folder) }},
+    summaryf=UnitTest.summary,
+  )
+  {%-   endif %}
+  {%- endfor %}
+  {%- endraw %}
+context =
+  key slapparameter_dict slap-configuration:configuration
+  key tests :tests
+  raw interpreter {{ interpreter }}
 
 [runTestSuite]
 env.sh = ${slapos-test-runner-nxdtest-environment.sh:rendered}