Python: Post-processing query for inline test expectations

python/ql/test/TestUtilities/InlineExpectationsTest.qll

@@ -5,15 +5,5 @@
 
 private import python as PY
 private import codeql.util.test.InlineExpectationsTest
-
-private module Impl implements InlineExpectationsTestSig {
-  /**
-   * A class representing line comments in Python. As this is the only form of comment Python
-   * permits, we simply reuse the `Comment` class.
-   */
-  class ExpectationComment = PY::Comment;
-
-  class Location = PY::Location;
-}
-
+private import internal.InlineExpectationsTestImpl
 import Make<Impl>

python/ql/test/TestUtilities/InlineExpectationsTestQuery.ql

@@ -0,0 +1,21 @@
+/**
+ * @kind test-postprocess
+ */
+
+private import python
+private import codeql.util.test.InlineExpectationsTest as T
+private import internal.InlineExpectationsTestImpl
+import T::TestPostProcessing
+import T::TestPostProcessing::Make<Impl, Input>
+
+private module Input implements T::TestPostProcessing::InputSig<Impl> {
+  string getRelativeUrl(Location location) {
+    exists(File f, int startline, int startcolumn, int endline, int endcolumn |
+      location.hasLocationInfo(_, startline, startcolumn, endline, endcolumn) and
+      f = location.getFile()
+    |
+      result =
+        f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
+    )
+  }
+}

python/ql/test/TestUtilities/internal/InlineExpectationsTestImpl.qll

@@ -0,0 +1,12 @@
+private import python as PY
+private import codeql.util.test.InlineExpectationsTest
+
+module Impl implements InlineExpectationsTestSig {
+  /**
+   * A class representing line comments in Python. As this is the only form of comment Python
+   * permits, we simply reuse the `Comment` class.
+   */
+  class ExpectationComment = PY::Comment;
+
+  class Location = PY::Location;
+}