Added testing with Catch2

.woodpecker/workflow.yaml

@@ -13,6 +13,8 @@ steps:
   - name: test
     image: ubuntu
     commands:
-      # TODO: Probably make actual tests at some point
+      # Automated tests, this should not fail
+      - ./test
+      # Manual test, you can see the output of this in woodpecker
       - echo "(print 42)" | ./build/main
   # TODO: add publish step, when we're at a working state.

CMakeLists.txt

@@ -1,10 +1,30 @@
 cmake_minimum_required(VERSION 3.16)
 project(lispy_stuff)
 
+# we'll use catch2 as testing library.
+include(FetchContent)
+FetchContent_Declare(
+    Catch2
+    GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+    GIT_TAG        v3.8.1
+)
+FetchContent_MakeAvailable(Catch2)
+list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/extras)
+include(Catch)
+
 set(HEADER_FILES src/include/lex.hpp)
-set(SOURCE_FILES src/main.cpp src/lex.cpp)
+set(SOURCE_FILES src/lex.cpp)
 
+# we're not actually shipping a library yet,
+# this is so we don't have to compile twice for main and tests.
+add_library(libmash STATIC ${SOURCE_FILES} ${HEADER_FILES})
+target_include_directories(libmash PUBLIC src/include/)
 
-add_executable(main ${SOURCE_FILES} ${HEADER_FILES})
+# Main target
+add_executable(main src/main.cpp)
+target_link_libraries(main libmash)
+
+# tests
+add_executable(test src/tests/test.cpp)
+target_link_libraries(test PRIVATE libmash Catch2::Catch2WithMain)
 
-target_include_directories(main PRIVATE src/include/)

src/tests/test.cpp

@@ -0,0 +1,21 @@
+#include <catch2/catch_test_macros.hpp>
+#include <lex.hpp>
+using namespace std;
+
+TEST_CASE("Lexer lexes doubles correctly", "[Lexer]") {
+    
+    SECTION("double and negative syntax") {
+        Lexer l("(1.0 0.1 -.1 -1. . - -. .-)");
+        REQUIRE(l.next() == Token({OpenParen}));
+        REQUIRE(l.next() == Token({Double, 1.0}));
+        REQUIRE(l.next() == Token({Double, 0.1}));
+        REQUIRE(l.next() == Token({Double, -0.1}));
+        REQUIRE(l.next() == Token({Double, -1.0}));
+        REQUIRE(l.next() == Token({Symbol, "."}));
+        REQUIRE(l.next() == Token({Symbol, "-"}));
+        REQUIRE(l.next() == Token({Symbol, "-."}));
+        REQUIRE(l.next() == Token({Symbol, ".-"}));
+        REQUIRE(l.next() == Token({CloseParen}));
+    }
+}
+