tests: add tests for lookup paths and imports

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I7e54691aa3e81efcb495124d13e8c24a6a6a6964

tests/import_lookup.nix

@@ -0,0 +1,3 @@
+# Test import with lookup path
+# Common pattern: import <nixpkgs> { }
+import <nixpkgs>

tests/import_simple.nix

@@ -0,0 +1,11 @@
+# Test import expression
+# Import evaluates the file and returns its value
+
+# Import a file that returns a simple value (42)
+import ./simple.nix
+
+# Can also import lookup paths:
+# import <nixpkgs> { }
+
+# Import with path expressions:
+# import (./dir + "/file.nix")

tests/lookup_path.nix

@@ -0,0 +1,9 @@
+# Test lookup path syntax
+# Lookup paths resolve via NIX_PATH environment variable
+# Example: <nixpkgs> -> /nix/var/nix/profiles/per-user/root/channels/nixpkgs
+
+# Simple lookup path
+<nixpkgs>
+
+# Nested lookup path (common pattern)
+# <nixpkgs/lib>

tests/lookup_path_nested.nix

@@ -0,0 +1,3 @@
+# Test nested lookup path
+# Common pattern in Nix: <nixpkgs/lib> or <nixpkgs/pkgs/stdenv>
+<nixpkgs/lib>

tests/regression_test.cpp

@@ -157,6 +157,116 @@ void test_parser_expect_in_speculative_parsing() {
             << std::endl;
 }
 
+void test_lookup_path_node() {
+  std::cout << "> Lookup path serialization..." << std::endl;
+
+  auto lookup = std::make_shared<Node>(ConstLookupPathNode("nixpkgs"));
+  IRModule module;
+  module.entry = lookup;
+
+  Serializer ser;
+  auto bytes = ser.serialize_to_bytes(module);
+
+  Deserializer deser;
+  auto loaded = deser.deserialize(bytes);
+
+  auto *loaded_lookup = loaded.entry->get_if<ConstLookupPathNode>();
+  TEST_CHECK(loaded_lookup != nullptr, "Deserialized node is ConstLookupPathNode");
+  TEST_CHECK(loaded_lookup && loaded_lookup->value == "nixpkgs",
+             "Lookup path value is 'nixpkgs'");
+}
+
+void test_import_node() {
+  std::cout << "> Import node serialization..." << std::endl;
+
+  auto path = std::make_shared<Node>(ConstPathNode("./test.nix"));
+  auto import_node = std::make_shared<Node>(ImportNode(path));
+  IRModule module;
+  module.entry = import_node;
+
+  Serializer ser;
+  auto bytes = ser.serialize_to_bytes(module);
+
+  Deserializer deser;
+  auto loaded = deser.deserialize(bytes);
+
+  auto *loaded_import = loaded.entry->get_if<ImportNode>();
+  TEST_CHECK(loaded_import != nullptr, "Deserialized node is ImportNode");
+  TEST_CHECK(loaded_import && loaded_import->path != nullptr,
+             "Import node has path");
+
+  if (loaded_import && loaded_import->path) {
+    auto *path_node = loaded_import->path->get_if<ConstPathNode>();
+    TEST_CHECK(path_node != nullptr, "Import path is ConstPathNode");
+    TEST_CHECK(path_node && path_node->value == "./test.nix",
+               "Import path value is './test.nix'");
+  }
+}
+
+void test_import_with_lookup_path() {
+  std::cout << "> Import with lookup path..." << std::endl;
+
+  auto lookup = std::make_shared<Node>(ConstLookupPathNode("nixpkgs"));
+  auto import_node = std::make_shared<Node>(ImportNode(lookup));
+  IRModule module;
+  module.entry = import_node;
+
+  Serializer ser;
+  auto bytes = ser.serialize_to_bytes(module);
+
+  Deserializer deser;
+  auto loaded = deser.deserialize(bytes);
+
+  auto *loaded_import = loaded.entry->get_if<ImportNode>();
+  TEST_CHECK(loaded_import != nullptr, "Deserialized node is ImportNode");
+
+  if (loaded_import && loaded_import->path) {
+    auto *lookup_node = loaded_import->path->get_if<ConstLookupPathNode>();
+    TEST_CHECK(lookup_node != nullptr, "Import path is ConstLookupPathNode");
+    TEST_CHECK(lookup_node && lookup_node->value == "nixpkgs",
+               "Lookup path value is 'nixpkgs'");
+  }
+}
+
+void test_uri_node() {
+  std::cout << "> URI node serialization..." << std::endl;
+
+  auto uri = std::make_shared<Node>(ConstURINode("https://example.com"));
+  IRModule module;
+  module.entry = uri;
+
+  Serializer ser;
+  auto bytes = ser.serialize_to_bytes(module);
+
+  Deserializer deser;
+  auto loaded = deser.deserialize(bytes);
+
+  auto *loaded_uri = loaded.entry->get_if<ConstURINode>();
+  TEST_CHECK(loaded_uri != nullptr, "Deserialized node is ConstURINode");
+  TEST_CHECK(loaded_uri && loaded_uri->value == "https://example.com",
+             "URI value is 'https://example.com'");
+}
+
+void test_float_node() {
+  std::cout << "> Float node serialization..." << std::endl;
+
+  auto float_val = std::make_shared<Node>(ConstFloatNode(3.14159));
+  IRModule module;
+  module.entry = float_val;
+
+  Serializer ser;
+  auto bytes = ser.serialize_to_bytes(module);
+
+  Deserializer deser;
+  auto loaded = deser.deserialize(bytes);
+
+  auto *loaded_float = loaded.entry->get_if<ConstFloatNode>();
+  TEST_CHECK(loaded_float != nullptr, "Deserialized node is ConstFloatNode");
+  TEST_CHECK(loaded_float && loaded_float->value > 3.14 &&
+                 loaded_float->value < 3.15,
+             "Float value is approximately 3.14159");
+}
+
 int main() {
   std::cout << "=== Regression Tests for Nixir ===" << std::endl << std::endl;
 
@@ -178,6 +288,21 @@ int main() {
   test_parser_expect_in_speculative_parsing();
   std::cout << std::endl;
 
+  test_lookup_path_node();
+  std::cout << std::endl;
+
+  test_import_node();
+  std::cout << std::endl;
+
+  test_import_with_lookup_path();
+  std::cout << std::endl;
+
+  test_uri_node();
+  std::cout << std::endl;
+
+  test_float_node();
+  std::cout << std::endl;
+
   std::cout << "=== Tests Complete ===" << std::endl;
   std::cout << "Failures: " << failures << std::endl;
   return failures > 0 ? 1 : 0;

tests/string_interp.nix

@@ -10,13 +10,11 @@ in {
   # Multiple interpolations
   multi = "x is ${x} and name is ${name}";
 
-  # Nested expression
-  nested = "Result: ${
-    if bool_val
-    then "yes"
-    else "no"
-  }";
+  # Expression evaluation in interpolation
+  computed = "x + 10 = ${x + 10}";
 
-  # Just a string (no interpolation)
+  bool_check = "${bool_val} is true!";
+
+  # Just a string, no interpolation
   plain = "plain text";
 }