Template allocation update and some tests

-test runner support before/after everty test callback funcion
-added some basic tests for template allocation
-added function to allocate new template from different template and list of addition and removed components

tests/basic.d

@@ -1,2 +1,174 @@
 module tests.basic;
 
+import ecs.manager;
+import ecs.core;
+
+struct CInt
+{
+    mixin ECS.Component;
+
+    alias value this;
+
+    int value = 1;
+}
+
+struct CFloat
+{
+    mixin ECS.Component;
+
+    alias value this;
+
+    float value = 2.0;
+}
+
+struct CDouble
+{
+    mixin ECS.Component;
+
+    alias value this;
+
+    double value = 3.0;
+}
+
+struct CLong
+{
+    mixin ECS.Component;
+
+    alias value this;
+
+    long value = 10;
+}
+
+struct CShort
+{
+    mixin ECS.Component;
+
+    alias value this;
+
+    short value = 12;
+}
+
+void beforeEveryTest()
+{
+    gEM.initialize(1);
+
+    gEM.registerComponent!CInt;
+    gEM.registerComponent!CFloat;
+    gEM.registerComponent!CDouble;
+    gEM.registerComponent!CLong;
+    gEM.registerComponent!CShort;
+}
+
+void afterEveryTest()
+{
+    gEM.destroy();
+}
+
+@("AddEntity")
+unittest
+{
+    ushort[2] ids = [CInt.component_id, CFloat.component_id];
+    EntityTemplate* tmpl_ = gEM.allocateTemplate(ids);
+    assert(tmpl_.info.components.length == 2);
+    assert(tmpl_.getComponent!CInt);
+    assert(tmpl_.getComponent!CFloat);
+    assert(*tmpl_.getComponent!CInt == 1);
+    assert(*tmpl_.getComponent!CFloat == 2.0);
+    
+    Entity* entity = gEM.addEntity(tmpl_);
+    assert(entity.getComponent!CInt);
+    assert(entity.getComponent!CFloat);
+    assert(*entity.getComponent!CInt == 1);
+    assert(*entity.getComponent!CFloat == 2.0);
+}
+
+//allocate templates
+@("AllocateTemplates")
+unittest
+{
+    //basic template allocation
+    ushort[2] ids = [CInt.component_id, CFloat.component_id];
+    EntityTemplate* tmpl_ = gEM.allocateTemplate(ids);
+    assert(tmpl_.info.components.length == 2);
+    assert(tmpl_.getComponent!CInt);
+    assert(tmpl_.getComponent!CFloat);
+    assert(*tmpl_.getComponent!CInt == 1);
+    assert(*tmpl_.getComponent!CFloat == 2.0);
+    *tmpl_.getComponent!CInt = 4;
+    *tmpl_.getComponent!CFloat = 5.0;
+
+    //allocate template from template with additional component
+    ushort[1] ids2 = [CDouble.component_id];
+    EntityTemplate* tmpl_2 = gEM.allocateTemplate(tmpl_, ids2);
+    assert(tmpl_2.info.components.length == 3);
+    assert(tmpl_2.getComponent!CInt);
+    assert(tmpl_2.getComponent!CFloat);
+    assert(tmpl_2.getComponent!CDouble);
+    assert(*tmpl_2.getComponent!CInt == 4);
+    assert(*tmpl_2.getComponent!CFloat == 5.0);
+    assert(*tmpl_2.getComponent!CDouble == 3.0);
+
+    Entity* entity = gEM.addEntity(tmpl_);
+    gEM.addComponents(entity.id, CDouble(8.0));
+
+    //apply entity changes
+    gEM.commit();
+
+    //allocate template as entity copy
+    EntityTemplate* tmpl_3 = gEM.allocateTemplate(entity.id);
+    assert(tmpl_3.info.components.length == 3);
+    assert(tmpl_3.getComponent!CInt);
+    assert(tmpl_3.getComponent!CFloat);
+    assert(tmpl_3.getComponent!CDouble);
+    assert(*tmpl_3.getComponent!CInt == 4);
+    assert(*tmpl_3.getComponent!CFloat == 5.0);
+    assert(*tmpl_3.getComponent!CDouble == 8.0);
+
+    //allocate template with entity data but default values
+    EntityTemplate* tmpl_4 = gEM.allocateTemplate(entity.id, true);
+    assert(tmpl_4.info.components.length == 3);
+    assert(tmpl_4.getComponent!CInt);
+    assert(tmpl_4.getComponent!CFloat);
+    assert(tmpl_4.getComponent!CDouble);
+    assert(*tmpl_4.getComponent!CInt == 1);
+    assert(*tmpl_4.getComponent!CFloat == 2.0);
+    assert(*tmpl_4.getComponent!CDouble == 3.0);
+
+    //allocate template from template with two additional component
+    ushort[2] ids3 = [CDouble.component_id, CLong.component_id];
+    EntityTemplate* tmpl_5 = gEM.allocateTemplate(tmpl_, ids3);
+    assert(tmpl_5.info.components.length == 4);
+    assert(tmpl_5.getComponent!CInt);
+    assert(tmpl_5.getComponent!CFloat);
+    assert(tmpl_5.getComponent!CDouble);
+    assert(tmpl_5.getComponent!CLong);
+    assert(*tmpl_5.getComponent!CInt == 4);
+    assert(*tmpl_5.getComponent!CFloat == 5.0);
+    assert(*tmpl_5.getComponent!CDouble == 3.0);
+    assert(*tmpl_5.getComponent!CLong == 10);
+
+    //allocate template from template without one component
+    ushort[1] rem_ids = [CFloat.component_id];
+    EntityTemplate* tmpl_6 = gEM.allocateTemplate(tmpl_, null, rem_ids);
+    assert(tmpl_6.info.components.length == 1);
+    assert(tmpl_6.getComponent!CInt);
+    assert(*tmpl_6.getComponent!CInt == 4);
+
+    //allocate template from template without one component and two additional
+    EntityTemplate* tmpl_7 = gEM.allocateTemplate(tmpl_, ids3, rem_ids);
+    assert(tmpl_7.info.components.length == 3);
+    assert(tmpl_7.getComponent!CInt);
+    assert(tmpl_7.getComponent!CDouble);
+    assert(tmpl_7.getComponent!CLong);
+    assert(*tmpl_7.getComponent!CInt == 4);
+    assert(*tmpl_7.getComponent!CDouble == 3.0);
+    assert(*tmpl_7.getComponent!CLong == 10);
+
+    gEM.freeTemplate(tmpl_);
+    gEM.freeTemplate(tmpl_2);
+    gEM.freeTemplate(tmpl_3);
+    gEM.freeTemplate(tmpl_4);
+    gEM.freeTemplate(tmpl_5);
+    gEM.freeTemplate(tmpl_6);
+    gEM.freeTemplate(tmpl_7);
+}