Update advanced.md

Adding back section that was lost in merge

googletest/docs/advanced.md

@@ -1817,6 +1817,67 @@ For technical reasons, there are some caveats:
 1.  `statement` in `EXPECT_FATAL_FAILURE{_ON_ALL_THREADS}()()` cannot return a
     value.
 
+## Registering tests programmatically	
+
+ The `TEST` macros handle the vast majority of all use cases, but there are few	
+were runtime registration logic is required. For those cases, the framework	
+provides the `::testing::RegisterTest` that allows callers to register arbitrary	
+tests dynamically.	
+ This is an advanced API only to be used when the `TEST` macros are insufficient.	
+The macros should be preferred when possible, as they avoid most of the	
+complexity of calling this function.	
+ It provides the following signature:	
+ ```c++	
+template <typename Factory>	
+TestInfo* RegisterTest(const char* test_case_name, const char* test_name,	
+                       const char* type_param, const char* value_param,	
+                       const char* file, int line, Factory factory);	
+```	
+ The `factory` argument is a factory callable (move-constructible) object or	
+function pointer that creates a new instance of the Test object. It handles	
+ownership to the caller. The signature of the callable is `Fixture*()`, where	
+`Fixture` is the test fixture class for the test. All tests registered with the	
+same `test_case_name` must return the same fixture type. This is checked at	
+runtime.	
+ The framework will infer the fixture class from the factory and will call the	
+`SetUpTestCase` and `TearDownTestCase` for it.	
+ Must be called before `RUN_ALL_TESTS()` is invoked, otherwise behavior is	
+undefined.	
+ Use case example:	
+ ```c++	
+class MyFixture : public ::testing::Test {	
+ public:	
+  // All of these optional, just like in regular macro usage.	
+  static void SetUpTestCase() { ... }	
+  static void TearDownTestCase() { ... }	
+  void SetUp() override { ... }	
+  void TearDown() override { ... }	
+};	
+ class MyTest : public MyFixture {	
+ public:	
+  explicit MyTest(int data) : data_(data) {}	
+  void TestBody() override { ... }	
+  private:	
+  int data_;	
+};	
+ void RegisterMyTests(const std::vector<int>& values) {	
+  for (int v : values) {	
+    ::testing::RegisterTest(	
+        "MyFixture", ("Test" + std::to_string(v)).c_str(), nullptr,	
+        std::to_string(v).c_str(),	
+        __FILE__, __LINE__,	
+        // Important to use the fixture type as the return type here.	
+        [=]() -> MyFixture* { return new MyTest(v); });	
+  }	
+}	
+...	
+int main(int argc, char** argv) {	
+  std::vector<int> values_to_test = LoadValuesFromConfig();	
+  RegisterMyTests(values_to_test);	
+  ...	
+  return RUN_ALL_TESTS();	
+}	
+```
 
 ## Getting the Current Test's Name