[v3] oeqa/sdk: Simplify test specification and discovery

diff --git a/meta/classes-recipe/testsdk.bbclass b/meta/classes-recipe/testsdk.bbclass
index 59d2834c99..b1c4fa67e6 100644
--- a/meta/classes-recipe/testsdk.bbclass
+++ b/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
diff --git a/meta/lib/oeqa/sdk/buildtools-docs-cases/README b/meta/lib/oeqa/buildtools-docs/cases/README
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-docs-cases/README
rename to meta/lib/oeqa/buildtools-docs/cases/README
diff --git a/meta/lib/oeqa/sdk/buildtools-docs-cases/build.py b/meta/lib/oeqa/buildtools-docs/cases/build.py
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-docs-cases/build.py
rename to meta/lib/oeqa/buildtools-docs/cases/build.py
diff --git a/meta/lib/oeqa/sdk/buildtools-cases/README b/meta/lib/oeqa/buildtools/cases/README
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-cases/README
rename to meta/lib/oeqa/buildtools/cases/README
diff --git a/meta/lib/oeqa/sdk/buildtools-cases/build.py b/meta/lib/oeqa/buildtools/cases/build.py
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-cases/build.py
rename to meta/lib/oeqa/buildtools/cases/build.py
diff --git a/meta/lib/oeqa/sdk/buildtools-cases/gcc.py b/meta/lib/oeqa/buildtools/cases/gcc.py
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-cases/gcc.py
rename to meta/lib/oeqa/buildtools/cases/gcc.py
diff --git a/meta/lib/oeqa/sdk/buildtools-cases/https.py b/meta/lib/oeqa/buildtools/cases/https.py
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-cases/https.py
rename to meta/lib/oeqa/buildtools/cases/https.py
diff --git a/meta/lib/oeqa/sdk/buildtools-cases/sanity.py b/meta/lib/oeqa/buildtools/cases/sanity.py
similarity index 100%
rename from meta/lib/oeqa/sdk/buildtools-cases/sanity.py
rename to meta/lib/oeqa/buildtools/cases/sanity.py
diff --git a/meta/lib/oeqa/sdk/testsdk.py b/meta/lib/oeqa/sdk/testsdk.py
index 52b702b6a2..cffcf9f49a 100644
--- a/meta/lib/oeqa/sdk/testsdk.py
+++ b/meta/lib/oeqa/sdk/testsdk.py
@@ -31,6 +31,28 @@  class TestSDK(TestSDKBase):
     context_class = OESDKTestContext
     test_type = 'sdk'
 
+    def sdk_dir_names(self, d):
+        """Return list from TESTSDK_CASE_DIRS."""
+        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 +137,7 @@  class TestSDK(TestSDKBase):
 
             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())
diff --git a/meta/recipes-core/meta/buildtools-docs-tarball.bb b/meta/recipes-core/meta/buildtools-docs-tarball.bb
index b9ef68eb6d..36f86d9855 100644
--- a/meta/recipes-core/meta/buildtools-docs-tarball.bb
+++ b/meta/recipes-core/meta/buildtools-docs-tarball.bb
@@ -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 = "buildtools-docs"
\ No newline at end of file
diff --git a/meta/recipes-core/meta/buildtools-tarball.bb b/meta/recipes-core/meta/buildtools-tarball.bb
index 6fa6d93a3d..02117ab84d 100644
--- a/meta/recipes-core/meta/buildtools-tarball.bb
+++ b/meta/recipes-core/meta/buildtools-tarball.bb
@@ -124,22 +124,7 @@  TOOLCHAIN_NEED_CONFIGSITE_CACHE = ""
 # The recipe doesn't need any default deps
 INHIBIT_DEFAULT_DEPS = "1"
 
-# Directory in testsdk that contains testcases
-TESTSDK_CASES = "buildtools-cases"
+inherit testsdk
 
-# We have our own code, avoid deferred inherit
-SDK_CLASSES:remove = "testsdk"
-
-python do_testsdk() {
-    import oeqa.sdk.testsdk
-    testsdk = oeqa.sdk.testsdk.TestSDK()
-
-    cases_path = os.path.join(os.path.abspath(os.path.dirname(oeqa.sdk.testsdk.__file__)), d.getVar("TESTSDK_CASES"))
-    testsdk.context_executor_class.default_cases = [cases_path,]
-
-    testsdk.run(d)
-}
-addtask testsdk
-do_testsdk[nostamp] = "1"
-do_testsdk[network] = "1"
-do_testsdk[depends] += "xz-native:do_populate_sysroot"
+# Directory that contains testcases
+TESTSDK_CASE_DIRS = "buildtools"
\ No newline at end of file