Code coverage tests for param.cc (#1872)

* Added code coverage unit tests for param.cc

* Updated ParamTests.cpp and removed ParamTestsConfFile.txt

* Updated ParamTests.cpp

* Removed NCCL_LOG_INFO and added sample cofig file

---------

Co-authored-by: Pawar <kpawar@ctr2-alola-ctrl-01.amd.com>

[ROCm/rccl commit: c9becd89cd]

projects/rccl/test/CMakeLists.txt

@@ -140,6 +140,7 @@ if(BUILD_TESTS)
     set(TEST_FIXTURE_SOURCE_FILES
       AltRsmiTests.cpp
       AllocTests.cpp
+      ParamTests.cpp
       ArgCheckTests.cpp
       BitOpsTests.cpp
       CollRegTests.cpp

projects/rccl/test/ParamTests.cpp

@@ -0,0 +1,41 @@
+#include "param.h"
+#include <gtest/gtest.h>
+#include <rccl/rccl.h>
+
+namespace RcclUnitTesting {
+TEST(ParamTests, initEnv_ParseValidConfFile) {
+  // Skip the test if NCCL_CONF_FILE is not set
+  const char *value = getenv("NCCL_CONF_FILE");
+
+  if (!value) {
+    GTEST_SKIP() << "SKIPPING TEST. Set environment variable NCCL_CONF_FILE.\n"
+                 << "A sample config file has been provided at: "
+                    "rccl/test/ParamTestsConfFile.txt\n"
+                 << "Set NCCL_CONF_FILE to the absolute path of this file to "
+                    "run the test.\n";
+  }
+  // This function call reads and opens the conf file from the path
+  // which is set using env. variable NCCL_CONF_FILE
+  initEnv();
+
+  EXPECT_EQ(getenv("TEST_VAR_WITH_NO_VALUE"), nullptr);
+  EXPECT_STREQ(getenv("TEST_VAR"), "12345");
+
+  // Clean up
+  unsetenv("TEST_VAR_WITH_NO_VALUE");
+  unsetenv("TEST_VAR");
+}
+
+TEST(ParamTests, ncclLoadParam_InvalidParam) {
+  int64_t cache = -1;
+  const int64_t defaultVal = 12345; // Dummy input value
+
+  // Force overflow: value exceeds int64_t max (9223372036854775807)
+  setenv("TEST_INVALID_PARAM", "99999999999999999999",
+         1); // Dummy variable and value
+  ncclLoadParam("TEST_INVALID_PARAM", defaultVal, -1, &cache);
+  unsetenv("TEST_INVALID_PARAM");
+
+  EXPECT_EQ(cache, defaultVal); // Cache should be set to default value
+}
+} // namespace RcclUnitTesting

projects/rccl/test/ParamTestsConfFile.txt

@@ -0,0 +1,3 @@
+# Comment: This file is required to run unit tests for param.cc
+TEST_VAR_WITH_NO_VALUE
+TEST_VAR=12345