diff --git a/src/errors/mod.rs b/src/errors/mod.rs
index af710920..800a33b5 100644
--- a/src/errors/mod.rs
+++ b/src/errors/mod.rs
@@ -30,3 +30,26 @@ impl fmt::Display for TransmuteError {
 }
 
 impl Error for TransmuteError {}
+
+#[cfg(test)]
+mod tests {
+    use serde::de::Error;
+
+    use super::*;
+
+    #[test]
+    fn test_transmute_error() {
+        let error = TransmuteError::new("Test error message");
+
+        assert_eq!(error.details, "Test error message");
+        assert_eq!(error.to_string(), "TransmuteError: Test error message");
+    }
+
+    #[test]
+    fn test_transmute_error_from() {
+        let yaml_error = serde_yaml::Error::custom("YAML parsing error");
+        let transmute_error: TransmuteError = yaml_error.into();
+
+        assert_eq!(transmute_error.details, "YAML parsing error");
+    }
+}
diff --git a/src/primitives/mod.rs b/src/primitives/mod.rs
index 72ac791a..26660f1a 100644
--- a/src/primitives/mod.rs
+++ b/src/primitives/mod.rs
@@ -54,3 +54,35 @@ impl From<u128> for WrapperF64 {
         WrapperF64::new(num as f64)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_from_u64() {
+        let value: u64 = 42;
+        let wrapper: WrapperF64 = value.into();
+        let expected: WrapperF64 = WrapperF64::new(42.0);
+
+        assert_eq!(wrapper, expected);
+    }
+
+    #[test]
+    fn test_from_i128() {
+        let value: i128 = -10;
+        let wrapper: WrapperF64 = value.into();
+        let expected: WrapperF64 = WrapperF64::new(-10.0);
+
+        assert_eq!(wrapper, expected);
+    }
+
+    #[test]
+    fn test_from_u128() {
+        let value: u128 = 1000;
+        let wrapper: WrapperF64 = value.into();
+        let expected: WrapperF64 = WrapperF64::new(1000.0);
+
+        assert_eq!(wrapper, expected);
+    }
+}