Added more tests

-added Vector test
-added HashMap test
-added EntityMeta test
-added default hashing function to hashmap

tests/vector.d

@@ -1,7 +1,16 @@
 module tests.vector;
 
 import bubel.ecs.simple_vector;
-//import bubel.ecs.vector;
+import bubel.ecs.vector;
+
+version(GNU)
+{
+	pragma(inline, true) T[n] staticArray(T, size_t n)(auto ref T[n] a)
+	{
+		return a;
+	}
+}
+else import std.array : staticArray;
 
 @("simple-vector")
 unittest
@@ -33,3 +42,38 @@ unittest
     assert(vector2[1023] == 'a');
     assert(vector2[1024] == 'b');
 }
+
+@("Vector")
+unittest
+{
+    struct G
+    {
+        int a;
+    }
+
+    Vector!G vector;
+    assert(vector.empty());
+    vector.add(G(1));
+    assert(!vector.empty());
+    vector.clear();
+    assert(vector.empty());
+    vector.add(G(1));
+    assert(!vector.empty());
+    vector.reset();
+    assert(vector.empty());
+
+    vector.add(G(1));
+    vector.add([G(2),G(5)].staticArray);
+    assert(vector.length == 3);
+    assert(vector.capacity == 1);
+    
+    Vector!G vector2;
+    vector2.add([G(1),G(2),G(5)].staticArray);
+    assert(vector == vector2);
+    vector2.remove(1);
+    assert(vector != vector2);
+    assert(vector2.length == 2);
+    assert(vector2[1] == G(5));
+    vector2.add(G(2),1);
+    assert(vector == vector2);
+}