Feature/cmake tests (#120)

adds `ctest` support

Author: noajshu

AGENTS.md

@@ -4,6 +4,27 @@
 - A bug in some LLM coding environments makes Bazel difficult to use, so agents should rely on CMake.
 - Keep both the CMake and Bazel builds working at all times.
 
+## Building with CMake
+
+When building with CMake, use parallel flags to speed up the process.
+
+- When using `cmake --build`, add the `--parallel` flag.
+- When using `make`, add the `-j` flag (e.g., `make -j$(nproc)`).
+
+## Running Tests with CMake
+
+To run the tests, execute the following commands from the root of the repository:
+
+```bash
+mkdir -p build
+cd build
+cmake ..
+cmake --build . --parallel
+ctest
+```
+
+
+
 ## Building the Python Wheel
 
 To build the Python wheel for `tesseract_decoder` locally, you will need to use the `bazel build` command and provide the version and Python target version as command-line arguments. This is because the `py_wheel` rule in the `BUILD` file uses "Make" variable substitution, which expects these values to be defined at build time.

CMakeLists.txt

@@ -58,6 +58,15 @@ FetchContent_Declare(
 set(PYBIND11_TEST OFF CACHE BOOL "" FORCE)
 FetchContent_MakeAvailable(pybind11)
 
+# Google Test
+FetchContent_Declare(
+  googletest
+  GIT_REPOSITORY https://github.com/google/googletest.git
+  GIT_TAG release-1.12.1
+)
+FetchContent_MakeAvailable(googletest)
+
+
 set(OPT_COPTS -Ofast -fno-fast-math -march=native)
 
 set(TESSERACT_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
@@ -111,3 +120,14 @@ set_target_properties(tesseract_decoder PROPERTIES
     LIBRARY_OUTPUT_DIRECTORY_RELWITHDEBINFO ${PROJECT_SOURCE_DIR}/src
 )
 
+# === Tests ===
+enable_testing()
+
+add_executable(common_test ${TESSERACT_SRC_DIR}/common.test.cc)
+target_link_libraries(common_test PRIVATE common GTest::gtest_main)
+add_test(NAME common_test COMMAND common_test)
+
+add_executable(tesseract_test ${TESSERACT_SRC_DIR}/tesseract.test.cc)
+target_link_libraries(tesseract_test PRIVATE tesseract_lib simplex GTest::gtest_main)
+add_test(NAME tesseract_test COMMAND tesseract_test)
+

src/tesseract.pybind.h

@@ -199,8 +199,6 @@ void add_tesseract_module(py::module& root) {
                 `TesseractConfig` object.
             )pbdoc");
 
-  
-
   py::class_<TesseractDecoder>(m, "TesseractDecoder", R"pbdoc(
         A class that implements the Tesseract decoding algorithm.