Adds more unit tests

src/utils/string_key.rs

@@ -109,3 +109,36 @@ const CRC_TABLE: &[u32] = &[
     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
     0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
 ];
+
+#[cfg(test)]
+mod tests {
+    extern crate test;
+
+    use crate::StringKey;
+
+    #[test]
+    fn create_empty_stringkey() {
+        let sk = StringKey::new("");
+        assert_eq!(sk.str(), "");
+        assert_eq!(sk.hash(), 0);
+        assert_eq!(sk.hash(), StringKey::get_hash_const(b""));
+    }
+
+    #[test]
+    fn create_stringkey_foo() {
+        let sk = StringKey::new("foo");
+        assert_eq!(sk.str(), "foo");
+        assert_eq!(sk.hash(), 2356372769);
+        assert_eq!(sk.hash(), StringKey::get_hash_const(b"foo"));
+        assert_eq!(sk.hash(), StringKey::get_hash_const(b"FOo"));
+    }
+
+    #[test]
+    fn create_stringkey_bar() {
+        let sk = StringKey::new("bar");
+        assert_eq!(sk.str(), "bar");
+        assert_eq!(sk.hash(), 1996459178);
+        assert_eq!(sk.hash(), StringKey::get_hash_const(b"bar"));
+        assert_eq!(sk.hash(), StringKey::get_hash_const(b"baR"));
+    }
+}