1 files changed, 49 insertions, 0 deletions
diff --git a/lib/path/tests/unit.nix b/lib/path/tests/unit.nix
index 15f5940a51e0d..eccf3b7b1c33b 100644
--- a/lib/path/tests/unit.nix
+++ b/lib/path/tests/unit.nix
@@ -70,6 +70,55 @@ let
       expr = subpath.isValid "foo/..../bar";
       expected = true;
     };
+
+    testSubpathNormaliseExample1 = {
+      expr = subpath.normalise "foo//bar";
+      expected = "./foo/bar";
+    };
+    testSubpathNormaliseExample2 = {
+      expr = subpath.normalise "foo/./bar";
+      expected = "./foo/bar";
+    };
+    testSubpathNormaliseExample3 = {
+      expr = subpath.normalise "foo/bar";
+      expected = "./foo/bar";
+    };
+    testSubpathNormaliseExample4 = {
+      expr = subpath.normalise "foo/bar/";
+      expected = "./foo/bar";
+    };
+    testSubpathNormaliseExample5 = {
+      expr = subpath.normalise "foo/bar/.";
+      expected = "./foo/bar";
+    };
+    testSubpathNormaliseExample6 = {
+      expr = subpath.normalise ".";
+      expected = "./.";
+    };
+    testSubpathNormaliseExample7 = {
+      expr = (builtins.tryEval (subpath.normalise "foo/../bar")).success;
+      expected = false;
+    };
+    testSubpathNormaliseExample8 = {
+      expr = (builtins.tryEval (subpath.normalise "")).success;
+      expected = false;
+    };
+    testSubpathNormaliseExample9 = {
+      expr = (builtins.tryEval (subpath.normalise "/foo")).success;
+      expected = false;
+    };
+    testSubpathNormaliseIsValidDots = {
+      expr = subpath.normalise "./foo/.bar/.../baz...qux";
+      expected = "./foo/.bar/.../baz...qux";
+    };
+    testSubpathNormaliseWrongType = {
+      expr = (builtins.tryEval (subpath.normalise null)).success;
+      expected = false;
+    };
+    testSubpathNormaliseTwoDots = {
+      expr = (builtins.tryEval (subpath.normalise "..")).success;
+      expected = false;
+    };
   };
 in
   if cases == [] then "Unit tests successful"