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diff --git a/testament/lib/stdtest/specialpaths.nim b/testament/lib/stdtest/specialpaths.nim
new file mode 100644
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+++ b/testament/lib/stdtest/specialpaths.nim
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+#[
+todo: move findNimStdLibCompileTime, findNimStdLib here
+xxx: factor pending https://github.com/timotheecour/Nim/issues/616
+
+## note: $lib vs $nim
+note: these can resolve to 3 different paths if running via `nim c --lib:lib foo`,
+eg if compiler was installed via nimble (or is in nim path), and nim is external
+(ie not in `$lib/../bin/` dir)
+
+import "$lib/../compiler/nimpaths" # <- most robust if you want to favor --lib:lib
+import "$nim/compiler/nimpaths"
+import compiler/nimpaths
+]#
+
+import os
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+# Note: all the const paths defined here are known at compile time and valid
+# so long Nim repo isn't relocated after compilation.
+# This means the binaries they produce will embed hardcoded paths, which
+# isn't appropriate for some applications that need to be relocatable.
+
+const
+  sourcePath = currentSourcePath()
+    # robust way to derive other paths here
+    # We don't depend on PATH so this is robust to having multiple nim binaries
+  nimRootDir* = sourcePath.parentDir.parentDir.parentDir.parentDir ## root of Nim repo
+  testsFname* = "tests"
+  stdlibDir* = nimRootDir / "lib"
+  systemPath* = stdlibDir / "system.nim"
+  testsDir* = nimRootDir / testsFname
+  buildDir* = nimRootDir / "build"
+    ## refs #10268: all testament generated files should go here to avoid
+    ## polluting .gitignore
+
+proc splitTestFile*(file: string): tuple[cat: string, path: string] =
+  ## At least one directory is required in the path, to use as a category name
+  runnableExamples:
+    doAssert splitTestFile("tests/fakedir/tfakename.nim") == ("fakedir", "tests/fakedir/tfakename.nim".unixToNativePath)
+  for p in file.parentDirs(inclusive = false):
+    let parent = p.parentDir
+    if parent.lastPathPart == testsFname:
+      result.cat = p.lastPathPart
+      let dir = getCurrentDir()
+      if file.isRelativeTo(dir):
+        result.path = file.relativePath(dir)
+      else:
+        result.path = file
+      return result
+  raiseAssert "file must match this pattern: '/pathto/tests/dir/**/tfile.nim', got: '" & file & "'"
+
+static:
+  # sanity check
+  doAssert fileExists(systemPath)