From 1c928616a40686540ddd7df9d151f4ad3f7f063c Mon Sep 17 00:00:00 2001
From: Karma Riuk <riukkarma@gmail.com>
Date: Sun, 29 Jun 2025 10:56:51 +0200
Subject: [PATCH] written structure and tests for lexer, missing implementation

---
 src/lexer/lexer.cpp |  0
 src/lexer/lexer.hpp |  7 +++++++
 test/lexer.cpp      | 35 +++++++++++++++++++++++++++++++++++
 test/test.cpp       | 20 ++++++++++++++++++++
 4 files changed, 62 insertions(+)
 create mode 100644 src/lexer/lexer.cpp
 create mode 100644 src/lexer/lexer.hpp
 create mode 100644 test/lexer.cpp
 create mode 100644 test/test.cpp

diff --git a/src/lexer/lexer.cpp b/src/lexer/lexer.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/lexer/lexer.hpp b/src/lexer/lexer.hpp
new file mode 100644
index 0000000..af2a122
--- /dev/null
+++ b/src/lexer/lexer.hpp
@@ -0,0 +1,7 @@
+#include "token/token.hpp"
+
+namespace lexer {
+    struct lexer {
+        token::token next_token();
+    };
+} // namespace lexer
diff --git a/test/lexer.cpp b/test/lexer.cpp
new file mode 100644
index 0000000..06bef4d
--- /dev/null
+++ b/test/lexer.cpp
@@ -0,0 +1,35 @@
+#include "lexer/lexer.hpp"
+
+#include "token/type.hpp"
+
+#include <doctest.h>
+#include <string>
+
+TEST_CASE("next token") {
+    struct test {
+        token::type expectedType;
+        std::string expectedLiteral;
+    };
+
+    std::string input = "=+(){},;";
+
+    lexer::lexer l{};
+
+    test tests[] = {
+        {token::type::ASSIGN, "="},
+        {token::type::PLUS, "+"},
+        {token::type::LPAREN, "("},
+        {token::type::RPAREN, ")"},
+        {token::type::LBRACE, "{"},
+        {token::type::RBRACE, "}"},
+        {token::type::COMMA, ","},
+        {token::type::SEMICOLON, ";"},
+        {token::type::EOF_, ""},
+    };
+
+    for (const auto& t : tests) {
+        token::token tok = l.next_token();
+        CHECK(tok.type == t.expectedType);
+        CHECK(tok.literal == t.expectedLiteral);
+    }
+};
diff --git a/test/test.cpp b/test/test.cpp
new file mode 100644
index 0000000..62f9c6c
--- /dev/null
+++ b/test/test.cpp
@@ -0,0 +1,20 @@
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include <doctest.h>
+
+int factorial(int number) {
+    return number <= 1 ? number : factorial(number - 1) * number;
+}
+
+TEST_CASE("fact") {
+    CHECK(factorial(1) == 1);
+    CHECK(factorial(2) == 2);
+    CHECK(factorial(3) == 6);
+    CHECK(factorial(10) == 3628800);
+}
+
+TEST_CASE("fact2") {
+    CHECK(factorial(1) == 1);
+    CHECK(factorial(2) == 2);
+    CHECK(factorial(3) == 6);
+    CHECK(factorial(10) == 3628800);
+}