oeqa/sdk: Simplify test specification and discovery

Simplify how tests are specified and discovered for different SDK configurations
to allow per-layer customization.

* Introduce `TESTSDK_CASE_DIRS` variable to specify test directory types,
  replacing the need to modify the default_cases class member

* Discover tests from configured layers using a common discovery pattern
  (`<LAYER_DIR>/lib/oeqa/<dirname>/cases`) where `<dirname>` is specified in `TESTSDK_CASE_DIRS`

* The buildtools directories were renamed to follow the common discovery pattern
(`<LAYER_DIR>/lib/oeqa/<dirname>/cases`) for consistency across all SDK configurations.

  meta/lib/oeqa/
  ├── sdk/cases/                 # (default) Standard SDK: dirname="sdk"
  ├── sdkbuildtools/cases/       # Buildtools: dirname="sdkbuildtools"
  └── sdkbuildtools-docs/cases/  # Buildtools-docs: dirname="sdkbuildtools-docs"

  meta-mingw/lib/oeqa/
  └── sdkmingw/cases/            # MinGW: dirname="sdkmingw"

  meta-foo/lib/oeqa/
  └── sdk/cases/                 # (default) Standard SDK: dirname="sdk"

* Add mingw sdk compatibility until meta-mingw migrates to TESTSDK_CASE_DIRS

Tested by:

1. Adding new tests using the default discovery pattern `<LAYER_DIR>/lib/oeqa/sdk/cases` and
   verifying they are discovered and executed.

2. Verifying existing SDK configuration tests work (requires -c populate_sdk first):
   * Standard SDK: `bitbake core-image-minimal -c testsdk`
   * Buildtools tarball: `bitbake buildtools-tarball -c testsdk`
   * Buildtools docs tarball: `bitbake buildtools-docs-tarball -c testsdk`
   * Mingw SDK: `SDKMACHINE=x86_64-mingw32 bitbake core-image-minimal -c testsdk`

Signed-off-by: Thune Tran <thune.a.tran@boeing.com>
Signed-off-by: Chuck Wolber <chuck.wolber@boeing.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Author: Thune Tran

meta/classes-recipe/testsdk.bbclass

@@ -19,6 +19,7 @@ TESTSDK_SUITES ?= ""
 
 TESTSDK_CLASS_NAME ?= "oeqa.sdk.testsdk.TestSDK"
 TESTSDKEXT_CLASS_NAME ?= "oeqa.sdkext.testsdk.TestSDKExt"
+TESTSDK_CASE_DIRS ?= "sdk"
 
 def import_and_run(name, d):
     import importlib

meta/lib/oeqa/sdk/testsdk.py

@@ -6,6 +6,13 @@
 
 from oeqa.sdk.context import OESDKTestContext, OESDKTestContextExecutor
 
+# TODO: drop once the meta-mingw layer migrates to TESTSDK_CASE_DIRS
+def mingw_default_dir(d):
+    sdkmach = d.getVar("SDKMACHINE") or ""
+    if sdkmach.endswith("mingw32"):
+        return "sdkmingw"
+    return ""
+
 class TestSDKBase(object):
     @staticmethod
     def get_sdk_configuration(d, test_type):
@@ -31,6 +38,32 @@ class TestSDK(TestSDKBase):
     context_class = OESDKTestContext
     test_type = 'sdk'
 
+    def sdk_dir_names(self, d):
+        """Return list from TESTSDK_CASE_DIRS."""
+        mingw_dir = mingw_default_dir(d)
+        if mingw_dir:
+            return mingw_dir.split()
+
+        testdirs = d.getVar("TESTSDK_CASE_DIRS")
+        if testdirs:
+            return testdirs.split()
+
+        bb.fatal("TESTSDK_CASE_DIRS unset, can't find SDK test directories.")
+
+    def get_sdk_paths(self, d):
+        """
+        Return a list of paths where SDK test cases reside.
+
+        SDK tests are expected in <LAYER_DIR>/lib/oeqa/<dirname>/cases
+        """
+        paths = []
+        for layer in d.getVar("BBLAYERS").split():
+            for dirname in self.sdk_dir_names(d):
+                case_path = os.path.join(layer, "lib", "oeqa", dirname, "cases")
+                if os.path.isdir(case_path):
+                    paths.append(case_path)
+        return paths
+
     def get_tcname(self, d):
         """
         Get the name of the SDK file
@@ -115,7 +148,7 @@ def run(self, d):
 
             try:
                 modules = (d.getVar("TESTSDK_SUITES") or "").split()
-                tc.loadTests(self.context_executor_class.default_cases, modules)
+                tc.loadTests(self.get_sdk_paths(d), modules)
             except Exception as e:
                 import traceback
                 bb.fatal("Loading tests failed:\n%s" % traceback.format_exc())

meta/lib/oeqa/sdk/buildtools-docs-cases/README renamed to meta/lib/oeqa/sdkbuildtools-docs/cases/README

@@ -16,4 +16,5 @@ TOOLCHAIN_OUTPUTNAME = "${SDK_ARCH}-buildtools-docs-nativesdk-standalone-${DISTR
 
 SDK_TITLE = "Docs Build tools tarball"
 
-TESTSDK_CASES = "buildtools-docs-cases"
+# Directory that contains testcases
+TESTSDK_CASE_DIRS = "sdkbuildtools-docs"