1 files changed, 76 insertions, 0 deletions
diff --git a/lib/path/tests/unit.nix b/lib/path/tests/unit.nix
new file mode 100644
index 00000000000..15f5940a51e
--- /dev/null
+++ b/lib/path/tests/unit.nix
@@ -0,0 +1,76 @@
+# Unit tests for lib.path functions. Use `nix-build` in this directory to
+# run these
+{ libpath }:
+let
+  lib = import libpath;
+  inherit (lib.path) subpath;
+
+  cases = lib.runTests {
+    testSubpathIsValidExample1 = {
+      expr = subpath.isValid null;
+      expected = false;
+    };
+    testSubpathIsValidExample2 = {
+      expr = subpath.isValid "";
+      expected = false;
+    };
+    testSubpathIsValidExample3 = {
+      expr = subpath.isValid "/foo";
+      expected = false;
+    };
+    testSubpathIsValidExample4 = {
+      expr = subpath.isValid "../foo";
+      expected = false;
+    };
+    testSubpathIsValidExample5 = {
+      expr = subpath.isValid "foo/bar";
+      expected = true;
+    };
+    testSubpathIsValidExample6 = {
+      expr = subpath.isValid "./foo//bar/";
+      expected = true;
+    };
+    testSubpathIsValidTwoDotsEnd = {
+      expr = subpath.isValid "foo/..";
+      expected = false;
+    };
+    testSubpathIsValidTwoDotsMiddle = {
+      expr = subpath.isValid "foo/../bar";
+      expected = false;
+    };
+    testSubpathIsValidTwoDotsPrefix = {
+      expr = subpath.isValid "..foo";
+      expected = true;
+    };
+    testSubpathIsValidTwoDotsSuffix = {
+      expr = subpath.isValid "foo..";
+      expected = true;
+    };
+    testSubpathIsValidTwoDotsPrefixComponent = {
+      expr = subpath.isValid "foo/..bar/baz";
+      expected = true;
+    };
+    testSubpathIsValidTwoDotsSuffixComponent = {
+      expr = subpath.isValid "foo/bar../baz";
+      expected = true;
+    };
+    testSubpathIsValidThreeDots = {
+      expr = subpath.isValid "...";
+      expected = true;
+    };
+    testSubpathIsValidFourDots = {
+      expr = subpath.isValid "....";
+      expected = true;
+    };
+    testSubpathIsValidThreeDotsComponent = {
+      expr = subpath.isValid "foo/.../bar";
+      expected = true;
+    };
+    testSubpathIsValidFourDotsComponent = {
+      expr = subpath.isValid "foo/..../bar";
+      expected = true;
+    };
+  };
+in
+  if cases == [] then "Unit tests successful"
+  else throw "Path unit tests failed: ${lib.generators.toPretty {} cases}"