bitpill 0.3.5

A personal medication management TUI application built in Rust.
Documentation 
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use std::convert::TryFrom;

use crate::application::dtos::requests::{CreateMedicationRequest, UpdateMedicationRequest};
use crate::application::errors::ApplicationError;
use crate::application::mappers::create_medication_mapper::CreateMedicationMapper;
use crate::application::mappers::update_medication_mapper::UpdateMedicationMapper;
use crate::domain::entities::medication::Medication;
use crate::domain::ports::mapper::Mapper;
use crate::domain::value_objects::medication_id::MedicationId;

/// Convert a CreateMedicationRequest into a domain Medication.
impl TryFrom<CreateMedicationRequest> for Medication {
    type Error = ApplicationError;

    fn try_from(request: CreateMedicationRequest) -> Result<Self, Self::Error> {
        Ok(CreateMedicationMapper.map(request)?)
    }
}

/// Convert an (UpdateMedicationRequest, MedicationId) tuple into a domain Medication.
impl TryFrom<(UpdateMedicationRequest, MedicationId)> for Medication {
    type Error = ApplicationError;

    fn try_from(src: (UpdateMedicationRequest, MedicationId)) -> Result<Self, Self::Error> {
        Ok(UpdateMedicationMapper.map(src)?)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use uuid::Uuid;

    fn create_req(name: &str, amount_mg: u32, freq: &str) -> CreateMedicationRequest {
        CreateMedicationRequest::new(name, amount_mg, vec![(8, 0)], freq)
    }

    fn update_req(name: &str, amount_mg: u32, freq: &str) -> UpdateMedicationRequest {
        UpdateMedicationRequest::new(Uuid::nil().to_string(), name, amount_mg, vec![(8, 0)], freq)
    }

    // --- CreateMedicationRequest ---

    #[test]
    fn try_from_create_request_with_valid_data_returns_medication() {
        let result = Medication::try_from(create_req("Aspirin", 500, "OnceDaily"));

        assert!(result.is_ok());
        let med = result.unwrap();
        assert_eq!(med.name().value(), "Aspirin");
        assert_eq!(med.dosage().amount_mg(), 500);
        assert!(!med.id().to_string().is_empty());
    }

    #[test]
    fn try_from_create_request_with_empty_name_returns_error() {
        let result = Medication::try_from(create_req("", 500, "OnceDaily"));

        assert!(matches!(
            result,
            Err(ApplicationError::Domain(
                crate::domain::errors::DomainError::EmptyMedicationName
            ))
        ));
    }

    #[test]
    fn try_from_create_request_with_zero_dosage_returns_error() {
        let result = Medication::try_from(create_req("Aspirin", 0, "OnceDaily"));

        assert!(matches!(
            result,
            Err(ApplicationError::Domain(
                crate::domain::errors::DomainError::InvalidDosage
            ))
        ));
    }

    #[test]
    fn try_from_create_request_with_invalid_scheduled_time_returns_error() {
        let request = CreateMedicationRequest::new("Aspirin", 500, vec![(25, 0)], "OnceDaily");

        let result = Medication::try_from(request);

        assert!(matches!(
            result,
            Err(ApplicationError::Domain(
                crate::domain::errors::DomainError::InvalidScheduledTime
            ))
        ));
    }

    #[test]
    fn try_from_create_request_each_call_generates_unique_id() {
        let med_a = Medication::try_from(create_req("Aspirin", 100, "OnceDaily")).unwrap();
        let med_b = Medication::try_from(create_req("Aspirin", 100, "OnceDaily")).unwrap();

        assert_ne!(med_a.id(), med_b.id());
    }

    // --- (UpdateMedicationRequest, MedicationId) ---

    #[test]
    fn try_from_update_tuple_with_valid_data_returns_medication_with_given_id() {
        let id = MedicationId::from(Uuid::nil());

        let result = Medication::try_from((update_req("Ibuprofen", 200, "TwiceDaily"), id.clone()));

        assert!(result.is_ok());
        let med = result.unwrap();
        assert_eq!(med.id(), &id);
        assert_eq!(med.name().value(), "Ibuprofen");
        assert_eq!(med.dosage().amount_mg(), 200);
    }

    #[test]
    fn try_from_update_tuple_with_empty_name_returns_error() {
        let id = MedicationId::from(Uuid::nil());

        let result = Medication::try_from((update_req("", 200, "OnceDaily"), id));

        assert!(matches!(
            result,
            Err(ApplicationError::Domain(
                crate::domain::errors::DomainError::EmptyMedicationName
            ))
        ));
    }

    #[test]
    fn try_from_update_tuple_with_zero_dosage_returns_error() {
        let id = MedicationId::from(Uuid::nil());

        let result = Medication::try_from((update_req("Aspirin", 0, "OnceDaily"), id));

        assert!(matches!(
            result,
            Err(ApplicationError::Domain(
                crate::domain::errors::DomainError::InvalidDosage
            ))
        ));
    }

    #[test]
    fn try_from_update_tuple_with_invalid_scheduled_time_returns_error() {
        let id = MedicationId::from(Uuid::nil());
        let request = UpdateMedicationRequest::new(
            Uuid::nil().to_string(),
            "Aspirin",
            500,
            vec![(25, 0)],
            "OnceDaily",
        );

        let result = Medication::try_from((request, id));

        assert!(matches!(
            result,
            Err(ApplicationError::Domain(
                crate::domain::errors::DomainError::InvalidScheduledTime
            ))
        ));
    }
}