f2: migrate toString-path.sh

Change-Id: I862f532e94e385aa0f14c03e38e7e003c7bc83c3

tests/functional/meson.build

@@ -141,7 +141,6 @@ functional_tests_scripts = [
   'store-ping.sh',
   'flakes/show.sh',
   'path-from-hash-part.sh',
-  'toString-path.sh',
   'read-only-store.sh',
   'nested-sandboxing.sh',
   'test-libstoreconsumer.sh',

tests/functional/toString-path.sh

@@ -1,8 +0,0 @@
-source common.sh
-
-mkdir -p $TEST_ROOT/foo
-echo bla > $TEST_ROOT/foo/bar
-
-[[ $(nix eval --raw --impure --expr "builtins.readFile (builtins.toString (builtins.fetchTree { type = \"path\"; path = \"$TEST_ROOT/foo\"; } + \"/bar\"))") = bla ]]
-
-[[ $(nix eval --json --impure --expr "builtins.readDir (builtins.toString (builtins.fetchTree { type = \"path\"; path = \"$TEST_ROOT/foo\"; }))") = '{"bar":"regular"}' ]]

tests/functional2/eval/test_to_string.py

@@ -0,0 +1,40 @@
+from testlib.fixtures.file_helper import with_files, File
+from testlib.fixtures.nix import Nix
+
+
+@with_files({"foo": {"bar": File("bla")}})
+def test_path_read_file(nix: Nix):
+    nix.settings.add_xp_feature("nix-command", "flakes")
+    res = (
+        nix.nix(
+            [
+                "eval",
+                "--raw",
+                "--impure",
+                "--expr",
+                f'builtins.readFile (builtins.toString (builtins.fetchTree {{ type = "path"; path = "{nix.env.dirs.home / "foo"}"; }} + "/bar"))',
+            ]
+        )
+        .run()
+        .ok()
+    )
+    assert res.stdout_plain == "bla"
+
+
+@with_files({"foo": {"bar": File("bla")}})
+def test_path_read_dir(nix: Nix):
+    nix.settings.add_xp_feature("nix-command", "flakes")
+    res = (
+        nix.nix(
+            [
+                "eval",
+                "--json",
+                "--impure",
+                "--expr",
+                f'builtins.readDir (builtins.toString (builtins.fetchTree {{ type = "path"; path = "{nix.env.dirs.home / "foo"}"; }}))',
+            ]
+        )
+        .run()
+        .ok()
+    )
+    assert res.stdout_plain == '{"bar":"regular"}'