tests: move fixtures to dedicated dir

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I9d6ce6a264780f215b1b57d947b5264c6a6a6964

tests/fixtures/inherit.nix

@@ -0,0 +1,20 @@
+# Test inherit keyword
+let
+  x = 10;
+  y = 20;
+  attrs = {
+    a = 1;
+    b = 2;
+    c = 3;
+  };
+in {
+  # Basic inherit from outer scope
+  inherit x y;
+
+  # Inherit from expression
+  inherit (attrs) a b;
+
+  # Mixed
+  z = 30;
+  inherit (attrs) c;
+}