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external/Catch2/docs/test-fixtures.md

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+<a id="top"></a>
+# Test fixtures
+
+## Defining test fixtures
+
+Although Catch allows you to group tests together as [sections within a test case](test-cases-and-sections.md), it can still be convenient, sometimes, to group them using a more traditional test fixture. Catch fully supports this too. You define the test fixture as a simple structure:
+
+```c++
+class UniqueTestsFixture {
+  private:
+   static int uniqueID;
+  protected:
+   DBConnection conn;
+  public:
+   UniqueTestsFixture() : conn(DBConnection::createConnection("myDB")) {
+   }
+  protected:
+   int getID() {
+     return ++uniqueID;
+   }
+ };
+
+ int UniqueTestsFixture::uniqueID = 0;
+
+ TEST_CASE_METHOD(UniqueTestsFixture, "Create Employee/No Name", "[create]") {
+   REQUIRE_THROWS(conn.executeSQL("INSERT INTO employee (id, name) VALUES (?, ?)", getID(), ""));
+ }
+ TEST_CASE_METHOD(UniqueTestsFixture, "Create Employee/Normal", "[create]") {
+   REQUIRE(conn.executeSQL("INSERT INTO employee (id, name) VALUES (?, ?)", getID(), "Joe Bloggs"));
+ }
+```
+
+The two test cases here will create uniquely-named derived classes of UniqueTestsFixture and thus can access the `getID()` protected method and `conn` member variables. This ensures that both the test cases are able to create a DBConnection using the same method (DRY principle) and that any ID's created are unique such that the order that tests are executed does not matter.
+
+
+Catch2 also provides `TEMPLATE_TEST_CASE_METHOD` and
+`TEMPLATE_PRODUCT_TEST_CASE_METHOD` that can be used together
+with templated fixtures and templated template fixtures to perform
+tests for multiple different types. Unlike `TEST_CASE_METHOD`,
+`TEMPLATE_TEST_CASE_METHOD` and `TEMPLATE_PRODUCT_TEST_CASE_METHOD` do
+require the tag specification to be non-empty, as it is followed by
+further macro arguments.
+
+Also note that, because of limitations of the C++ preprocessor, if you
+want to specify a type with multiple template parameters, you need to
+enclose it in parentheses, e.g. `std::map<int, std::string>` needs to be
+passed as `(std::map<int, std::string>)`.
+In the case of `TEMPLATE_PRODUCT_TEST_CASE_METHOD`, if a member of the
+type list should consist of more than single type, it needs to be enclosed
+in another pair of parentheses, e.g. `(std::map, std::pair)` and
+`((int, float), (char, double))`.
+
+Example:
+```cpp
+template< typename T >
+struct Template_Fixture {
+    Template_Fixture(): m_a(1) {}
+
+    T m_a;
+};
+
+TEMPLATE_TEST_CASE_METHOD(Template_Fixture,
+                          "A TEMPLATE_TEST_CASE_METHOD based test run that succeeds",
+                          "[class][template]",
+                          int, float, double) {
+    REQUIRE( Template_Fixture<TestType>::m_a == 1 );
+}
+
+template<typename T>
+struct Template_Template_Fixture {
+    Template_Template_Fixture() {}
+
+    T m_a;
+};
+
+template<typename T>
+struct Foo_class {
+    size_t size() {
+        return 0;
+    }
+};
+
+TEMPLATE_PRODUCT_TEST_CASE_METHOD(Template_Template_Fixture,
+                                  "A TEMPLATE_PRODUCT_TEST_CASE_METHOD based test succeeds",
+                                  "[class][template]",
+                                  (Foo_class, std::vector),
+                                  int) {
+    REQUIRE( Template_Template_Fixture<TestType>::m_a.size() == 0 );
+}
+```
+
+_While there is an upper limit on the number of types you can specify
+in single `TEMPLATE_TEST_CASE_METHOD` or `TEMPLATE_PRODUCT_TEST_CASE_METHOD`,
+the limit is very high and should not be encountered in practice._
+
+## Signature-based parametrised test fixtures
+
+> [Introduced](https://github.com/catchorg/Catch2/issues/1609) in Catch2 2.8.0.
+
+Catch2 also provides `TEMPLATE_TEST_CASE_METHOD_SIG` and `TEMPLATE_PRODUCT_TEST_CASE_METHOD_SIG` to support
+fixtures using non-type template parameters. These test cases work similar to `TEMPLATE_TEST_CASE_METHOD` and `TEMPLATE_PRODUCT_TEST_CASE_METHOD`,
+with additional positional argument for [signature](test-cases-and-sections.md#signature-based-parametrised-test-cases).
+
+Example:
+```cpp
+template <int V>
+struct Nttp_Fixture{
+    int value = V;
+};
+
+TEMPLATE_TEST_CASE_METHOD_SIG(
+    Nttp_Fixture,
+    "A TEMPLATE_TEST_CASE_METHOD_SIG based test run that succeeds",
+    "[class][template][nttp]",
+    ((int V), V),
+    1, 3, 6) {
+    REQUIRE(Nttp_Fixture<V>::value > 0);
+}
+
+template<typename T>
+struct Template_Fixture_2 {
+    Template_Fixture_2() {}
+
+    T m_a;
+};
+
+template< typename T, size_t V>
+struct Template_Foo_2 {
+    size_t size() { return V; }
+};
+
+TEMPLATE_PRODUCT_TEST_CASE_METHOD_SIG(
+    Template_Fixture_2,
+    "A TEMPLATE_PRODUCT_TEST_CASE_METHOD_SIG based test run that succeeds",
+    "[class][template][product][nttp]",
+    ((typename T, size_t S), T, S),
+    (std::array, Template_Foo_2),
+    ((int,2), (float,6))) {
+    REQUIRE(Template_Fixture_2<TestType>{}.m_a.size() >= 2);
+}
+```
+
+## Template fixtures with types specified in template type lists
+
+Catch2 also provides `TEMPLATE_LIST_TEST_CASE_METHOD` to support template fixtures with types specified in
+template type lists like `std::tuple`, `boost::mpl::list` or `boost::mp11::mp_list`. This test case works the same as `TEMPLATE_TEST_CASE_METHOD`,
+only difference is the source of types. This allows you to reuse the template type list in multiple test cases.
+
+Example:
+```cpp
+using MyTypes = std::tuple<int, char, double>;
+TEMPLATE_LIST_TEST_CASE_METHOD(Template_Fixture,
+                               "Template test case method with test types specified inside std::tuple",
+                               "[class][template][list]",
+                               MyTypes) {
+    REQUIRE( Template_Fixture<TestType>::m_a == 1 );
+}
+```
+
+---
+
+[Home](Readme.md#top)