Add ast::node and handle<T*, Error> comparison

And parser test for literals fingerscrossed
This commit is good, innit? But there will also be second one, and dessert

Signed-off-by: CHatingPython <chatingpython@gmail.com>

furc/test/parser.cpp

@@ -30,4 +30,31 @@ TEST(Parser, EmptyFunctions) {
     }
 }
 
+TEST(Parser, Literals) {
+    parser parser("<TEMP>", R"(
+    func test1() { return 67; }
+    func test2() { return "uwu"; }
+    )");
+    auto   program = parser.parse();
+    EXPECT_TRUE(program.present());
+    EXPECT_EQ(program->declarations().size(), 2);
+    {
+        auto test1 = program->declarations()[0];
+        EXPECT_TRUE(test1.present());
+        EXPECT_EQ(test1->declaration_type(), declaration_node_t::FunctionDefinition);
+        node_handle<function_definition_node> funcDef = test1;
+        EXPECT_EQ(funcDef->name()->string, "test1");
+        EXPECT_EQ(funcDef->body()->statements.size(), 1);
+        node_handle<return_statement_node> ret = funcDef->body()->statements[0];
+        EXPECT_EQ(ret->value(), integer_literal_node({ furc::location{ "<TEMP>", 1, 26 }, 67 }));
+    }
+    {
+        auto test2 = program->declarations()[1];
+        EXPECT_TRUE(test2.present());
+        EXPECT_EQ(test2->declaration_type(), declaration_node_t::FunctionDefinition);
+        node_handle<function_definition_node> funcDecl = test2;
+        EXPECT_EQ(funcDecl->name()->string, "test2");
+    }
+}
+
 } // namespace