feat: include minor and major quantity description in Product and amend DB for same

closes: #54

.sqlx/query-c091fbfdc77afd15d73933c5092be72fda7a14b38462b52a8a4d6e8eee00f7c6.json

@@ -1,6 +1,6 @@
 {
   "db_name": "PostgreSQL",
-  "query": "INSERT INTO cqrs_inventory_product_query (\n                        version,\n                        name,\n                        description,\n                        image,\n                        product_id,\n                        category_id,\n                        price_major,\n                        price_minor,\n                        price_currency,\n                        sku_able,\n                        quantity_unit,\n                        quantity_number,\n                        deleted\n                    ) VALUES (\n                        $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13\n                    );",
+  "query": "INSERT INTO cqrs_inventory_product_query (\n                        version,\n                        name,\n                        description,\n                        image,\n                        product_id,\n                        category_id,\n                        price_major,\n                        price_minor,\n                        price_currency,\n                        sku_able,\n                        quantity_minor_unit,\n                        quantity_minor_number,\n                        quantity_major_unit,\n                        quantity_major_number,\n\n                        deleted\n                    ) VALUES (\n                        $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15\n                    );",
   "describe": {
     "columns": [],
     "parameters": {
@@ -17,10 +17,12 @@
         "Bool",
         "Text",
         "Int4",
+        "Text",
+        "Int4",
         "Bool"
       ]
     },
     "nullable": []
   },
-  "hash": "9390910c71001ef77313e594dea0e4f0682f740778e483a2db91d6c73ac6bc6d"
+  "hash": "c091fbfdc77afd15d73933c5092be72fda7a14b38462b52a8a4d6e8eee00f7c6"
 }

.sqlx/query-e2f9f291a20aac77851774ba8cd37325143a4d98e0980632f097c5885cc71094.json

@@ -1,6 +1,6 @@
 {
   "db_name": "PostgreSQL",
-  "query": "UPDATE\n                        cqrs_inventory_product_query\n                    SET\n                        version = $1,\n                        name = $2,\n                        description = $3,\n                        image = $4,\n                        product_id = $5,\n                        category_id = $6,\n                        price_major = $7,\n                        price_minor = $8,\n                        price_currency = $9,\n                        sku_able = $10,\n                        quantity_unit = $11,\n                        quantity_number = $12,\n                        deleted = $13;",
+  "query": "UPDATE\n                        cqrs_inventory_product_query\n                    SET\n                        version = $1,\n                        name = $2,\n                        description = $3,\n                        image = $4,\n                        product_id = $5,\n                        category_id = $6,\n                        price_major = $7,\n                        price_minor = $8,\n                        price_currency = $9,\n                        sku_able = $10,\n                        quantity_minor_unit = $11,\n                        quantity_minor_number = $12,\n                        quantity_major_unit = $13,\n                        quantity_major_number = $14,\n                        deleted = $15;",
   "describe": {
     "columns": [],
     "parameters": {
@@ -17,10 +17,12 @@
         "Bool",
         "Text",
         "Int4",
+        "Text",
+        "Int4",
         "Bool"
       ]
     },
     "nullable": []
   },
-  "hash": "f55fe530202bb369fdea3baaf91f86bbc866218e4146b6d608255c1b929073b4"
+  "hash": "e2f9f291a20aac77851774ba8cd37325143a4d98e0980632f097c5885cc71094"
 }

.sqlx/query-f40df2534cbf3a44afdd27bb19cff0c62d56d9236356287d56e965b5e2a7b3d2.json

@@ -1,6 +1,6 @@
 {
   "db_name": "PostgreSQL",
-  "query": "SELECT \n                name,\n                description,\n                image,\n                product_id,\n                category_id,\n                price_major,\n                price_minor,\n                price_currency,\n                sku_able,\n                quantity_unit,\n                quantity_number,\n                deleted\n             FROM\n                cqrs_inventory_product_query\n            WHERE\n                product_id = $1;",
+  "query": "SELECT \n                name,\n                description,\n                image,\n                product_id,\n                category_id,\n                price_major,\n                price_minor,\n                price_currency,\n                sku_able,\n                quantity_minor_unit,\n                quantity_minor_number,\n                quantity_major_unit,\n                quantity_major_number,\n                deleted\n             FROM\n                cqrs_inventory_product_query\n            WHERE\n                product_id = $1;",
   "describe": {
     "columns": [
       {
@@ -50,16 +50,26 @@
       },
       {
         "ordinal": 9,
-        "name": "quantity_unit",
+        "name": "quantity_minor_unit",
         "type_info": "Text"
       },
       {
         "ordinal": 10,
-        "name": "quantity_number",
+        "name": "quantity_minor_number",
         "type_info": "Int4"
       },
       {
         "ordinal": 11,
+        "name": "quantity_major_unit",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 12,
+        "name": "quantity_major_number",
+        "type_info": "Int4"
+      },
+      {
+        "ordinal": 13,
         "name": "deleted",
         "type_info": "Bool"
       }
@@ -81,8 +91,10 @@
       false,
       false,
       false,
+      false,
+      false,
       false
     ]
   },
-  "hash": "3f83167782a2de1be7d87d35f63a3e530373595ce83cd36612ee48d3c36c81f3"
+  "hash": "f40df2534cbf3a44afdd27bb19cff0c62d56d9236356287d56e965b5e2a7b3d2"
 }

migrations/20240715113708_cqrs_inventory_product_query.sql

@@ -17,8 +17,10 @@ CREATE TABLE IF NOT EXISTS cqrs_inventory_product_query
     price_major INTEGER NOT NULL,
     price_currency TEXT NOT NULL,
 
-    quantity_number INTEGER NOT NULL,
-    quantity_unit TEXT NOT NULL,
+    quantity_major_number INTEGER NOT NULL,
+    quantity_minor_number INTEGER NOT NULL,
+    quantity_major_unit TEXT NOT NULL,
+    quantity_minor_unit TEXT NOT NULL,
 
 	category_id UUID NOT NULL,
 

src/inventory/adapters/output/db/postgres/product_id_exists.rs

@@ -84,11 +84,13 @@ pub mod tests {
                     price_minor,
                     price_currency,
                     sku_able,
-                    quantity_unit,
-                    quantity_number,
+                    quantity_minor_unit,
+                    quantity_minor_number,
+                    quantity_major_unit,
+                    quantity_major_number,
                     deleted
                 ) VALUES (
-                    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13
+                    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15
                 );",
             1,
             p.name(),
@@ -100,8 +102,10 @@ pub mod tests {
             p.price().minor().clone() as i32,
             p.price().currency().to_string(),
             p.sku_able().clone(),
-            p.quantity().unit().to_string(),
-            p.quantity().number().clone() as i32,
+            p.quantity().major().unit().to_string(),
+            p.quantity().major().number().clone() as i32,
+            p.quantity().minor().unit().to_string(),
+            p.quantity().minor().number().clone() as i32,
             p.deleted().clone(),
         )
         .execute(&db.pool)

src/inventory/adapters/output/db/postgres/product_view.rs

@@ -14,8 +14,9 @@ use super::errors::*;
 use super::InventoryDBPostgresAdapter;
 use crate::inventory::domain::events::InventoryEvent;
 use crate::inventory::domain::product_aggregate::{
-    Currency, PriceBuilder, Product, ProductBuilder, QuantityBuilder, QuantityUnit,
+    Currency, PriceBuilder, Product, ProductBuilder,
 };
+use crate::types::quantity::*;
 use crate::utils::parse_aggregate_id::parse_aggregate_id;
 
 pub const NEW_PRODUCT_NON_UUID: &str = "new_product_non_uuid-asdfa";
@@ -34,8 +35,10 @@ pub struct ProductView {
     price_major: i32,
     price_currency: String,
 
-    quantity_unit: String,
-    quantity_number: i32,
+    quantity_major_number: i32,
+    quantity_minor_number: i32,
+    quantity_major_unit: String,
+    quantity_minor_unit: String,
 
     category_id: Uuid,
 
@@ -52,8 +55,20 @@ impl From<ProductView> for Product {
             .unwrap();
 
         let quantity = QuantityBuilder::default()
-            .number(v.quantity_number as usize)
-            .unit(QuantityUnit::from_str(&v.quantity_unit).unwrap())
+            .minor(
+                QuantityPartBuilder::default()
+                    .number(v.quantity_minor_number as usize)
+                    .unit(QuantityUnit::from_str(&v.quantity_minor_unit).unwrap())
+                    .build()
+                    .unwrap(),
+            )
+            .major(
+                QuantityPartBuilder::default()
+                    .number(v.quantity_major_number as usize)
+                    .unit(QuantityUnit::from_str(&v.quantity_major_unit).unwrap())
+                    .build()
+                    .unwrap(),
+            )
             .build()
             .unwrap();
 
@@ -91,8 +106,10 @@ impl View<Product> for ProductView {
                 self.price_major = *val.price().major() as i32;
                 self.price_currency = val.price().currency().to_string();
 
-                self.quantity_number = *val.quantity().number() as i32;
-                self.quantity_unit = val.quantity().unit().to_string();
+                self.quantity_major_number = *val.quantity().major().number() as i32;
+                self.quantity_minor_number = *val.quantity().minor().number() as i32;
+                self.quantity_major_unit = val.quantity().major().unit().to_string();
+                self.quantity_minor_unit = val.quantity().minor().unit().to_string();
 
                 self.deleted = false;
             }
@@ -121,8 +138,10 @@ impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
                 price_minor,
                 price_currency,
                 sku_able,
-                quantity_unit,
-                quantity_number,
+                quantity_minor_unit,
+                quantity_minor_number,
+                quantity_major_unit,
+                quantity_major_number,
                 deleted
              FROM
                 cqrs_inventory_product_query
@@ -158,8 +177,10 @@ impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
                 price_minor,
                 price_currency,
                 sku_able,
-                quantity_unit,
-                quantity_number,
+                quantity_minor_unit,
+                quantity_minor_number,
+                quantity_major_unit,
+                quantity_major_number,
                 deleted
              FROM
                 cqrs_inventory_product_query
@@ -214,11 +235,14 @@ impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
                         price_minor,
                         price_currency,
                         sku_able,
-                        quantity_unit,
-                        quantity_number,
+                        quantity_minor_unit,
+                        quantity_minor_number,
+                        quantity_major_unit,
+                        quantity_major_number,
+
                         deleted
                     ) VALUES (
-                        $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13
+                        $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15
                     );",
                     version,
                     view.name,
@@ -230,8 +254,10 @@ impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
                     view.price_minor,
                     view.price_currency,
                     view.sku_able,
-                    view.quantity_unit,
-                    view.quantity_number,
+                    view.quantity_minor_unit,
+                    view.quantity_minor_number,
+                    view.quantity_major_unit,
+                    view.quantity_major_number,
                     view.deleted,
                 )
                 .execute(&self.pool)
@@ -255,9 +281,11 @@ impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
                         price_minor = $8,
                         price_currency = $9,
                         sku_able = $10,
-                        quantity_unit = $11,
-                        quantity_number = $12,
-                        deleted = $13;",
+                        quantity_minor_unit = $11,
+                        quantity_minor_number = $12,
+                        quantity_major_unit = $13,
+                        quantity_major_number = $14,
+                        deleted = $15;",
                     version,
                     view.name,
                     view.description,
@@ -268,8 +296,10 @@ impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
                     view.price_minor,
                     view.price_currency,
                     view.sku_able,
-                    view.quantity_unit,
-                    view.quantity_number,
+                    view.quantity_minor_unit,
+                    view.quantity_minor_number,
+                    view.quantity_major_unit,
+                    view.quantity_major_number,
                     view.deleted,
                 )
                 .execute(&self.pool)

src/inventory/domain/add_product_command.rs

@@ -8,7 +8,8 @@ use derive_more::{Display, Error};
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
-use super::product_aggregate::{Price, Quantity};
+use super::product_aggregate::Price;
+use crate::types::quantity::*;
 
 #[derive(Debug, Error, Display, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
 pub enum AddProductCommandError {
@@ -88,9 +89,7 @@ pub mod tests {
     use super::*;
 
     use crate::{
-        inventory::domain::product_aggregate::{
-            Currency, PriceBuilder, QuantityBuilder, QuantityUnit,
-        },
+        inventory::domain::product_aggregate::{Currency, PriceBuilder},
         utils::uuid::tests::UUID,
     };
 
@@ -110,8 +109,20 @@ pub mod tests {
             .unwrap();
 
         let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
+            .minor(
+                QuantityPartBuilder::default()
+                    .number(0)
+                    .unit(QuantityUnit::DiscreteNumber)
+                    .build()
+                    .unwrap(),
+            )
+            .major(
+                QuantityPartBuilder::default()
+                    .number(1)
+                    .unit(QuantityUnit::DiscreteNumber)
+                    .build()
+                    .unwrap(),
+            )
             .build()
             .unwrap();
 
@@ -143,11 +154,8 @@ pub mod tests {
             .currency(Currency::INR)
             .build()
             .unwrap();
-        let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
-            .build()
-            .unwrap();
+
+        let quantity = Quantity::default();
 
         // description = None
         let cmd = UnvalidatedAddProductCommandBuilder::default()
@@ -188,11 +196,8 @@ pub mod tests {
             .currency(Currency::INR)
             .build()
             .unwrap();
-        let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
-            .build()
-            .unwrap();
+
+        let quantity = Quantity::default();
 
         let cmd = UnvalidatedAddProductCommandBuilder::default()
             .name(name.into())
@@ -233,11 +238,8 @@ pub mod tests {
             .currency(Currency::INR)
             .build()
             .unwrap();
-        let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
-            .build()
-            .unwrap();
+
+        let quantity = Quantity::default();
 
         let cmd = UnvalidatedAddProductCommandBuilder::default()
             .name("".into())

src/inventory/domain/product_added_event.rs

@@ -7,7 +7,8 @@ use derive_getters::Getters;
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
-use super::product_aggregate::{Price, Quantity};
+use super::product_aggregate::Price;
+use crate::types::quantity::Quantity;
 
 #[derive(
     Clone, Debug, Builder, Serialize, Deserialize, Getters, Eq, PartialEq, Ord, PartialOrd,

src/inventory/domain/product_aggregate.rs

@@ -15,54 +15,7 @@ use uuid::Uuid;
 use super::{commands::InventoryCommand, events::InventoryEvent};
 use crate::inventory::application::services::errors::*;
 use crate::inventory::application::services::InventoryServicesInterface;
-
-#[derive(Clone, Display, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd)]
-pub enum QuantityUnit {
-    #[display(fmt = "{}", KILO_GRAM)]
-    Kilogram,
-    #[display(fmt = "{}", GRAM)]
-    Gram,
-    #[display(fmt = "{}", DISCRETE_NUMBER)]
-    DiscreteNumber, // example: 1 sofa, 2 bed, etc.
-    #[display(fmt = "{}", MILLI_LITER)]
-    MilliLiter,
-    #[display(fmt = "{}", LITER)]
-    Liter,
-}
-
-impl Default for QuantityUnit {
-    fn default() -> Self {
-        Self::DiscreteNumber
-    }
-}
-
-const KILO_GRAM: &str = "kg";
-const GRAM: &str = "g";
-const DISCRETE_NUMBER: &str = "discrete_number";
-const MILLI_LITER: &str = "ml";
-const LITER: &str = "l";
-
-impl FromStr for QuantityUnit {
-    type Err = String;
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s.trim() {
-            KILO_GRAM => Ok(Self::Kilogram),
-            GRAM => Ok(Self::Gram),
-            DISCRETE_NUMBER => Ok(Self::DiscreteNumber),
-            MILLI_LITER => Ok(Self::MilliLiter),
-            LITER => Ok(Self::Liter),
-            _ => Err("Currency unsupported".into()),
-        }
-    }
-}
-
-#[derive(
-    Clone, Debug, Serialize, Default, Deserialize, Eq, PartialEq, Ord, PartialOrd, Builder, Getters,
-)]
-pub struct Quantity {
-    number: usize,
-    unit: QuantityUnit,
-}
+use crate::types::quantity::Quantity;
 
 #[derive(Clone, Display, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd)]
 pub enum Currency {
@@ -250,29 +203,4 @@ mod aggregate_tests {
     fn currency_to_string_from_str() {
         assert!(test_helper(Currency::INR, INR));
     }
-
-    #[test]
-    fn quantity_unit_kilogram() {
-        assert!(test_helper(QuantityUnit::Kilogram, KILO_GRAM));
-    }
-
-    #[test]
-    fn quantity_unit_gram() {
-        assert!(test_helper(QuantityUnit::Gram, GRAM));
-    }
-
-    #[test]
-    fn quantity_unit_discrete_number() {
-        assert!(test_helper(QuantityUnit::DiscreteNumber, DISCRETE_NUMBER));
-    }
-
-    #[test]
-    fn quantity_unit_milli_liter() {
-        assert!(test_helper(QuantityUnit::MilliLiter, MILLI_LITER));
-    }
-
-    #[test]
-    fn quantity_unit_liter() {
-        assert!(test_helper(QuantityUnit::Liter, LITER));
-    }
 }

src/inventory/domain/stock_aggregate.rs

@@ -8,7 +8,7 @@ use serde::{Deserialize, Serialize};
 use time::OffsetDateTime;
 use uuid::Uuid;
 
-use super::product_aggregate::Quantity;
+use crate::types::quantity::Quantity;
 
 // stock keeping unit
 // TODO: will implement later, have to figure out how to print SKU label and during billing.

src/inventory/domain/update_product_command.rs

@@ -10,7 +10,8 @@ use derive_more::{Display, Error};
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
-use super::product_aggregate::{Price, Product, Quantity};
+use super::product_aggregate::{Price, Product};
+use crate::types::quantity::Quantity;
 
 #[derive(Debug, Error, Display, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
 pub enum UpdateProductCommandError {
@@ -92,10 +93,9 @@ impl UnvalidatedUpdateProductCommand {
 pub mod tests {
     use super::*;
 
+    use crate::types::quantity::*;
     use crate::{
-        inventory::domain::product_aggregate::{
-            Currency, PriceBuilder, QuantityBuilder, QuantityUnit,
-        },
+        inventory::domain::product_aggregate::{Currency, PriceBuilder},
         utils::uuid::tests::UUID,
     };
 
@@ -115,8 +115,20 @@ pub mod tests {
             .unwrap();
 
         let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
+            .minor(
+                QuantityPartBuilder::default()
+                    .number(0)
+                    .unit(QuantityUnit::DiscreteNumber)
+                    .build()
+                    .unwrap(),
+            )
+            .major(
+                QuantityPartBuilder::default()
+                    .number(1)
+                    .unit(QuantityUnit::DiscreteNumber)
+                    .build()
+                    .unwrap(),
+            )
             .build()
             .unwrap();
 
@@ -149,11 +161,8 @@ pub mod tests {
             .currency(Currency::INR)
             .build()
             .unwrap();
-        let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
-            .build()
-            .unwrap();
+
+        let quantity = Quantity::default();
 
         // description = None
         let cmd = UnvalidatedUpdateProductCommandBuilder::default()
@@ -196,11 +205,8 @@ pub mod tests {
             .currency(Currency::INR)
             .build()
             .unwrap();
-        let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
-            .build()
-            .unwrap();
+
+        let quantity = Quantity::default();
 
         let cmd = UnvalidatedUpdateProductCommandBuilder::default()
             .name(name.into())
@@ -242,11 +248,8 @@ pub mod tests {
             .currency(Currency::INR)
             .build()
             .unwrap();
-        let quantity = QuantityBuilder::default()
-            .number(1)
-            .unit(QuantityUnit::DiscreteNumber)
-            .build()
-            .unwrap();
+
+        let quantity = Quantity::default();
 
         let cmd = UnvalidatedUpdateProductCommandBuilder::default()
             .name("".into())

src/main.rs

@@ -17,6 +17,7 @@ mod ordering;
 mod settings;
 #[cfg(test)]
 mod tests;
+mod types;
 mod utils;
 
 #[actix_web::main]

src/types/mod.rs

@@ -0,0 +1 @@
+pub mod quantity;

src/types/quantity.rs

@@ -0,0 +1,108 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::str::FromStr;
+
+use derive_builder::Builder;
+use derive_getters::Getters;
+use derive_more::Display;
+use serde::{Deserialize, Serialize};
+
+#[derive(
+    Clone, Default, Display, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd,
+)]
+pub enum QuantityUnit {
+    #[display(fmt = "{}", KILO_GRAM)]
+    Kilogram,
+    #[display(fmt = "{}", GRAM)]
+    Gram,
+    #[default]
+    #[display(fmt = "{}", DISCRETE_NUMBER)]
+    DiscreteNumber, // example: 1 sofa, 2 bed, etc.
+    #[display(fmt = "{}", MILLI_LITER)]
+    MilliLiter,
+    #[display(fmt = "{}", LITER)]
+    Liter,
+}
+
+const KILO_GRAM: &str = "kg";
+const GRAM: &str = "g";
+const DISCRETE_NUMBER: &str = "discrete_number";
+const MILLI_LITER: &str = "ml";
+const LITER: &str = "l";
+
+impl FromStr for QuantityUnit {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.trim() {
+            KILO_GRAM => Ok(Self::Kilogram),
+            GRAM => Ok(Self::Gram),
+            DISCRETE_NUMBER => Ok(Self::DiscreteNumber),
+            MILLI_LITER => Ok(Self::MilliLiter),
+            LITER => Ok(Self::Liter),
+            _ => Err("Currency unsupported".into()),
+        }
+    }
+}
+
+#[derive(
+    Clone, Debug, Default, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Builder, Getters,
+)]
+pub struct QuantityPart {
+    number: usize,
+    unit: QuantityUnit,
+}
+
+#[derive(
+    Clone, Default, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Builder, Getters,
+)]
+pub struct Quantity {
+    minor: QuantityPart,
+    major: QuantityPart,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn test_helper<T>(t: T, str_value: &str) -> bool
+    where
+        T: ToString + FromStr + std::fmt::Debug + PartialEq,
+        <T as FromStr>::Err: std::fmt::Debug,
+    {
+        println!("Testing type: {:?} against value {str_value}", t);
+        assert_eq!(t.to_string(), str_value.to_string());
+
+        assert_eq!(T::from_str(str_value).unwrap(), t);
+
+        assert_eq!(T::from_str(t.to_string().as_str()).unwrap(), t,);
+
+        true
+    }
+
+    #[test]
+    fn quantity_unit_kilogram() {
+        assert!(test_helper(QuantityUnit::Kilogram, KILO_GRAM));
+    }
+
+    #[test]
+    fn quantity_unit_gram() {
+        assert!(test_helper(QuantityUnit::Gram, GRAM));
+    }
+
+    #[test]
+    fn quantity_unit_discrete_number() {
+        assert!(test_helper(QuantityUnit::DiscreteNumber, DISCRETE_NUMBER));
+    }
+
+    #[test]
+    fn quantity_unit_milli_liter() {
+        assert!(test_helper(QuantityUnit::MilliLiter, MILLI_LITER));
+    }
+
+    #[test]
+    fn quantity_unit_liter() {
+        assert!(test_helper(QuantityUnit::Liter, LITER));
+    }
+}