fix!: WithFee::with_fee method

primitives/Cargo.toml

@@ -2,7 +2,7 @@
 authors = ['GalacticCouncil']
 edition = '2018'
 name = 'primitives'
-version = '3.1.0'
+version = '4.0.0'
 
 [build-dependencies]
 substrate-wasm-builder = {package = 'substrate-wasm-builder', version = '3.0.0'}

primitives/src/lib.rs

@@ -113,16 +113,22 @@ pub mod fee {
 		Self: Sized,
 	{
 		fn with_fee(&self, fee: Fee) -> Option<Self>;
+		fn without_fee(&self, fee: Fee) -> Option<Self>;
 		fn just_fee(&self, fee: Fee) -> Option<Self>;
 		fn discounted_fee(&self) -> Option<Self>;
 	}
 
 	impl WithFee for Balance {
 		fn with_fee(&self, fee: Fee) -> Option<Self> {
-			self.checked_mul(fee.denominator as Self - fee.numerator as Self)?
+			self.checked_mul(fee.denominator as Self + fee.numerator as Self)?
 				.checked_div(fee.denominator as Self)
 		}
 
+		fn without_fee(&self, fee: Fee) -> Option<Self> {
+			self.checked_mul(fee.denominator as Self)?
+				.checked_div(fee.denominator as Self + fee.numerator as Self)
+		}
+
 		fn just_fee(&self, fee: Fee) -> Option<Self> {
 			self.checked_mul(fee.numerator as Self)?
 				.checked_div(fee.denominator as Self)
@@ -137,3 +143,22 @@ pub mod fee {
 		}
 	}
 }
+
+#[cfg(test)]
+mod tests {
+	use super::fee::*;
+
+	#[test]
+	// This function tests that fee calculations return correct amounts
+	fn fee_calculations_should_work() {
+		let fee = Fee{
+			numerator: 2,
+			denominator: 1_000,
+		};
+
+		assert_eq!(1_000.with_fee(fee), Some(1_002));
+		assert_eq!(1_002.without_fee(fee), Some(1_000));
+		assert_eq!(1_000.just_fee(fee), Some(2));
+		assert_eq!(1_000_000.discounted_fee(), Some(700));
+	}
+}

runtime/Cargo.toml

@@ -5,7 +5,7 @@ homepage = 'https://github.com/galacticcouncil/hydradx-node'
 license = 'Apache 2.0'
 name = 'hydra-dx-runtime'
 repository = 'https://github.com/galacticcouncil/hydradx-node'
-version = '14.1.0'
+version = '14.2.0'
 
 [package.metadata.docs.rs]
 targets = ['x86_64-unknown-linux-gnu']