Extended tests for Integer class

- added tests for arithmetic operators

test/cases/boxing/IntegerTest.cpp

@@ -1,3 +1,12 @@
+/*
+ * Author:          Patrick-Christopher Mattulat
+ * Company:         Lynar Studios
+ * E-Mail:          webmaster@lynarstudios.com
+ * Created:         2020-08-09
+ * Changed:         2020-08-09
+ *
+ * */
+
 #include <gtest/gtest.h>
 #include "../../../source/boxing/Integer.hpp"
 
@@ -25,4 +34,58 @@ namespace
     ASSERT_EQ(-13, -x);
     ASSERT_EQ(13, -y);
   }
-}
+
+  TEST_F(IntegerTest, operatorAssignment)
+  {
+    ls_std::Integer x {13};
+    ASSERT_EQ(13, x);
+
+    x = 44;
+    ASSERT_EQ(44, x);
+  }
+
+  TEST_F(IntegerTest, operatorAddition)
+  {
+    ls_std::Integer x {13};
+    ls_std::Integer y {7};
+    ls_std::Integer z {-15};
+
+    ASSERT_EQ(20, x + y);
+    ASSERT_EQ(5, x + y + z);
+    ASSERT_EQ(15, x + 2);
+    ASSERT_EQ(0, x + 2 + z);
+  }
+
+  TEST_F(IntegerTest, operatorMultiplication)
+  {
+    ls_std::Integer x {3};
+    ls_std::Integer y {7};
+    ls_std::Integer z {5};
+
+    ASSERT_EQ(21, x * y);
+    ASSERT_EQ(105, x * y * z);
+    ASSERT_EQ(6, x * 2);
+    ASSERT_EQ(71, 1 + y * 2 * z);
+  }
+
+  TEST_F(IntegerTest, operatorSubtraction)
+  {
+    ls_std::Integer x {51};
+    ls_std::Integer y {17};
+
+    ASSERT_EQ(34, x - y);
+    ASSERT_EQ(30, x - 21);
+    ASSERT_EQ(13, x - 21 - y);
+  }
+
+  TEST_F(IntegerTest, operatorDivision)
+  {
+    ls_std::Integer x {81};
+    ls_std::Integer y {9};
+
+    ASSERT_EQ(9, x / y);
+    ASSERT_EQ(3, 9 / 3);
+    ASSERT_EQ(3, x / y / 3);
+    ASSERT_EQ(1, 19 / 10);
+  }
+}