More number conversion code

100% coverage

tests/number_system_conversion.rs

@@ -81,3 +81,19 @@ fn split_bytes_u16_join_bytes_u16() {
             NumberSystemConversion::join_bytes_u16(high as u16, low as u16));
     }
 }
+
+#[test]
+fn combine_u8_to_u16() {
+    let test_params: Vec<((u8, u8), u16)> = vec![
+        ((0xff, 0x00), 0x00ff),
+        ((0x00, 0xff), 0xff00),
+        ((0xbe, 0xef), 0xefbe),
+        ((0xef, 0xbe), 0xbeef)
+    ];
+
+    for  ((low, high), base) in test_params {
+        assert_eq!(
+            base, NumberSystemConversion::combine_u8_to_u16(low, high)
+        )
+    }
+}