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66 lines
2.4 KiB
Markdown
66 lines
2.4 KiB
Markdown
<a id="top"></a>
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# Test fixtures
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Although Catch allows you to group tests together as sections within a test case, 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:
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```c++
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class UniqueTestsFixture {
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private:
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static int uniqueID;
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protected:
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DBConnection conn;
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public:
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UniqueTestsFixture() : conn(DBConnection::createConnection("myDB")) {
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}
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protected:
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int getID() {
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return ++uniqueID;
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}
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};
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int UniqueTestsFixture::uniqueID = 0;
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TEST_CASE_METHOD(UniqueTestsFixture, "Create Employee/No Name", "[create]") {
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REQUIRE_THROWS(conn.executeSQL("INSERT INTO employee (id, name) VALUES (?, ?)", getID(), ""));
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}
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TEST_CASE_METHOD(UniqueTestsFixture, "Create Employee/Normal", "[create]") {
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REQUIRE(conn.executeSQL("INSERT INTO employee (id, name) VALUES (?, ?)", getID(), "Joe Bloggs"));
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}
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```
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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.
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Catch2 also provides `TEMPLATE_TEST_CASE_METHOD` that can be used together
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with templated fixtures to perform tests for multiple different types.
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However, unlike `TEST_CASE_METHOD`, `TEMPLATE_TEST_CASE_METHOD` requires
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the tag specification to be non-empty, as it is followed by further macros
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arguments.
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Also note that, because of limitations of the C++ preprocessor, if you
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want to specify a type with multiple template parameters, you need to
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enclose it in parentheses, e.g. `std::map<int, std::string>` needs to be
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passed as `(std::map<int, std::string>)`.
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Example:
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```cpp
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template< typename T >
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struct Template_Fixture {
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Template_Fixture(): m_a(1) {}
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T m_a;
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};
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TEMPLATE_TEST_CASE_METHOD(Template_Fixture,"A TEMPLATE_TEST_CASE_METHOD based test run that succeeds", "[class][template]", int, float, double) {
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REQUIRE( Template_Fixture<TestType>::m_a == 1 );
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}
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```
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_While there is an upper limit on the number of types you can specify
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in single `TEMPLATE_TEST_CASE`, the limit is very high and should not
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be encountered in practice._
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---
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[Home](Readme.md#top)
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