Add unittest doc

source/developer/developer.rst

@@ -12,12 +12,12 @@ The Developer Guide
 Write your own importer
 -----------------------
 
-In this chapter you will learn how to write your own importers. You just need to implement the #Assimp::BaseImporter class,
-which defines a few abstract methods, register your loader, test it carefully and provide test models for it.
+In this chapter, you will learn how to write your own importers. You just need to implement the #Assimp::BaseImporter class,
+which defines a few abstract methods, registers your loader, tests it carefully and provides test models for it.
 
 * Create a header-file **FormatNameImporter.h** and a cpp-unit ( **FormatNameImporter.cpp** ) in the **<root>/code/AssetLib/** directory
 * Add them to the following workspaces: CMAKE (code/CMakeLists.txt, create a new source group for your importer and put them also to ADD_LIBRARY( assimp SHARED))
-* Include *AssimpPCH.h* - this is the PCH file, and it includes already most Assimp-internal stuff.
+* Include *AssimpPCH.h* - this is the PCH file, and it already includes most Assimp-internal stuff.
 * Open ImporterRegistry.cpp.cpp and include your header just below the *(include_new_importers_here)* line, guarded by a #define
 
 ::
@@ -29,17 +29,17 @@ which defines a few abstract methods, register your loader, test it carefully an
 Wrap the same guard around your .cpp!
 
 * Now advance to the **(register_new_importers_here)** line in the **ImporterRegistry.cpp** and register your importer there - just like all the others do.
-* Setup a suitable test environment (i.e. use AssimpView or your own application), make sure to enable
-  the #aiProcess_ValidateDataStructure flag and enable verbose logging. That is, simply call before you import anything:
+* Set up a suitable test environment (i.e. use AssimpView or your own application), make sure to enable
+  the #aiProcess_ValidateDataStructure flag, and enable verbose logging. That is, call before you import anything:
 
 :: 
 
     DefaultLogger::create("AssimpLog.txt",Logger::VERBOSE)
 
 * Implement the **Assimp::BaseImporter::CanRead()** : here the format detection will be perfoormed. You can detect the format by its extension or by parsing some token of the file content
-* Implement **Assimp::BaseImporter::InternReadFile()** : Here you have to parse the file fomat and convert it into a aiScene-Instance:
-* Implement **Assimp::BaseImporter::GetExtensionList()** : here you have to add the provided extensions (for the Wavefront-Files add .obj for instance).
-* For error handling, throw a dynamic allocated **ImportErrorException** (see Appendix A) for critical errors, and log errors, warnings, infos and debuginfos
+* Implement **Assimp::BaseImporter::InternReadFile()**: Here you have to parse the file format and convert it into an aiScene-Instance:
+* Implement **Assimp::BaseImporter::GetExtensionList()**: here you have to add the provided extensions (for the Wavefront-Files add .obj for instance).
+* For error handling, throw a dynamic allocated **ImportErrorException** (see Appendix A) for critical errors, and log errors, warnings, infos, and debug info
   with **DefaultLogger::get()->[error, warn, debug, info]**.
 * A simple example:
 
@@ -71,16 +71,52 @@ Wrap the same guard around your .cpp!
 ::
 
 * Make sure that your loader compiles against all build configurations on all supported platforms. You can use our CI-build to check several platforms 
-  like Windows and Linux (32 bit and 64 bit).
+  like Windows and Linux (32-bit and 64-bit).
 * Provide some _free_ test models in <root>/test/models/<FormatName> and credit their authors.
-  Test files for a file format shouldn't be too large (*~500 KiB in total*), and not too repetive. Try to cover all format features with test data.
-* Done! Please, share your loader that everyone can profit from it!
+  Test files for a file format shouldn't be too large (*~500 KiB in total*), and not too repetitive. Try to cover all format features with test data.
+* Done! Please, share your loader so that everyone can profit from it!
 
 Write your own exporter
 -----------------------
 
 ToDo!
 
+Write your own unit / integration-test
+--------------------------------------
+After the importer and the exporter is ready you need to test them. The common way for doing this will be explained in this chapter. Assimp does provide 
+some useful test utilities for importer and exporter testing. 
+
+Start writing test code for your importer and exporter by creating a test class at **test/unit/ImportExport/<YourImporterName>**. 
+Check the following example to get a better understanding of how your test class shall look like:
+
+::
+
+    #include "AbstractImportExportBase.h"
+    #include "UnitTestPCH.h"
+    // Add more depending includes based on your test
+
+    class utMyImporter : public AbstractImportExportBase {
+    public:
+        bool importerTest() override {
+            Assimp::Importer importer;
+            const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MyFormat/Wuson.myformat", aiProcess_ValidateDataStructure);
+            return nullptr != scene;
+        }
+    };
+
+    TEST_F(utMyImporter, importTest) {
+        EXPECT_TRUE(importerTest());
+    }
+
+
+Add this to the **CMakeLists.txt** at **test/unit/CMakeLists.txt** and run the build. Add your basic test file at **test/models/MyFormat**.
+Now you can run the test:
+* Navigate into the binary folder
+* Execute the application **unit** or **unit.exe** on Windows-Platforms.
+* Check your result and fix it until all tests are green again.
+
+These tests will run for each PR as a test. The CI will also check your code for leaks or undefined behaviors.
+
 
 Parser tools
 ------------
@@ -89,10 +125,10 @@ XML-Parser:
 ###########
 To use the XML-Parser you need to follow these steps:
 - Include the header XmlParser.h
-- Create a XML-Parser instance
+- Create an XML-Parser instance
 - Load the data from an input stream into the parser
 - Perform the parsing
-- When this was succesful, iterate over the XML-Nodes:
+- When this was successful, iterate over the XML-Nodes:
 
 ::
 

source/usage/use_the_lib.rst

@@ -1,9 +1,9 @@
 .. image:: https://www.assimp.org/common/images/splash-color.png
 .. _ai_access_cpp:
 
-==============================
-Working with Asset-ImporterLib
-==============================
+===================================
+Working with the Asset-Importer-Lib
+===================================
 
 Importing Data
 ==============