Fixed incrementing offset after a read with a MockI2CDevice

Author: eldruin

CHANGELOG.md

@@ -9,6 +9,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 ## [Unreleased]
 
 - Derived common traits for public types.
+- Fixed incrementing offset after a read with a `MockI2CDevice`.
 
 ## [v0.6.0] - 2023-08-03
 

src/mock.rs

@@ -45,6 +45,7 @@ impl I2CRegisterMap {
     fn read(&mut self, data: &mut [u8]) -> I2CResult<()> {
         let len = data.len();
         data.clone_from_slice(&self.registers[self.offset..(self.offset + len)]);
+        self.offset += data.len();
         println!("READ  | 0x{:X} : {:?}", self.offset - data.len(), data);
         Ok(())
     }
@@ -157,3 +158,10 @@ where
         Ok(messages.len() as u32)
     }
 }
+
+#[test]
+fn check_read_0() {
+    let mut i2c = MockI2CDevice::new();
+    let value = i2c.smbus_read_byte_data(0).unwrap();
+    assert_eq!(value, 0);
+}