Add simle googletest for bdf function

Author: Alexander Antonov

CMakeLists.txt

@@ -184,6 +184,8 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 add_subdirectory(src)
 add_subdirectory(examples)
 add_subdirectory(tests)
+add_subdirectory(utests)
+add_subdirectory(googletest)
 
 message(STATUS "Install directory: ${CMAKE_INSTALL_PREFIX}")
 

src/lspci.h

@@ -170,11 +170,28 @@ struct bdf {
     uint8_t busno;
     uint8_t devno;
     uint8_t funcno;
+
     bdf() : domainno(0), busno(0), devno(0), funcno(0) {}
     bdf(uint32_t domain, uint8_t bus, uint8_t device, uint8_t function) :
         domainno(domain), busno(bus), devno(device), funcno(function) {}
     bdf(uint8_t bus, uint8_t device, uint8_t function) :
         domainno(0), busno(bus), devno(device), funcno(function) {}
+
+    std::string to_string() const {
+        std::ostringstream oss;
+        oss << std::hex << std::uppercase << std::setfill('0')
+            << std::setw(DOMAIN_WIDTH) << domainno << ":"
+            << std::setw(BUS_WIDTH) << static_cast<int>(busno) << ":"
+            << std::setw(DEVICE_WIDTH) << static_cast<int>(devno) << "."
+            << std::setw(FUNCTION_WIDTH) << static_cast<int>(funcno);
+        return oss.str();
+    }
+
+    private:
+        static const int DOMAIN_WIDTH = 4;
+        static const int BUS_WIDTH = 2;
+        static const int DEVICE_WIDTH = 2;
+        static const int FUNCTION_WIDTH = 1;
 };
 
 struct pci {

utests/CMakeLists.txt

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) 2022-2025, Intel Corporation
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin/utests)
+
+if(UNIX)
+    project(pcm_utests LANGUAGES CXX)
+
+    enable_testing()
+
+    include_directories(../src/)
+    include_directories("${GMOCK_DIR}/include")
+
+    file(GLOB LSPCI_TEST_FILES lspci-utest.cpp ../src/lspci.cpp)
+    set(LIBS PCM_STATIC)
+    add_executable(lspci-utest ${LSPCI_TEST_FILES})
+
+    target_link_libraries(
+        lspci-utest
+        GTest::gtest_main
+        GTest::gmock_main
+        ${LIBS}
+    )
+
+    include(GoogleTest)
+    gtest_discover_tests(lspci-utest)
+endif(UNIX)

utests/lspci-utest.cpp

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2009-2025, Intel Corporation
+// written by Alexander Antonov
+
+#include "lspci.h"
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace pcm;
+
+TEST(BDFTest, ToStringDefaultConstructor)
+{
+    struct bdf default_bdf;
+    EXPECT_EQ(default_bdf.to_string(), "0000:00:00.0");
+}
+
+TEST(BDFTest, ToStringCustomConstructor)
+{
+    struct bdf custom_bdf(0x1234, 0x56, 0x10, 0x7);
+    EXPECT_EQ(custom_bdf.to_string(), "1234:56:10.7");
+}
+
+TEST(BDFTest, ToStringPartialConstructor)
+{
+    struct bdf partial_bdf(0x56, 0x10, 0x7);
+    EXPECT_EQ(partial_bdf.to_string(), "0000:56:10.7");
+}