diff --git a/src/operator/tests.rs b/src/operator/tests.rs
index 3ec78a75..ed683bd5 100644
--- a/src/operator/tests.rs
+++ b/src/operator/tests.rs
@@ -102,3 +102,95 @@ fn test_custom_ops() -> crate::Result<()> {
 
 	Ok(())
 }
+
+struct AttrTesterIntFloat;
+
+impl Operator for AttrTesterIntFloat {
+	fn name(&self) -> &str {
+		"AttrTesterIntFloat"
+	}
+
+	fn inputs(&self) -> Vec<OperatorInput> {
+		vec![OperatorInput::required(TensorElementType::Float32)]
+	}
+
+	fn outputs(&self) -> Vec<OperatorOutput> {
+		vec![OperatorOutput::required(TensorElementType::Float32)]
+	}
+
+	fn infer_shape(&self, ctx: &mut super::ShapeInferenceContext) -> crate::Result<()> {
+		assert!(matches!(ctx.attr("a_int"), Ok(1_i64)));
+		assert!(matches!(ctx.attr("a_float"), Ok(2.0_f32)));
+		assert!(matches!(ctx.attr::<Vec<i64>>("ints").as_deref(), Ok(&[3, 4, 5])));
+		assert!(matches!(ctx.attr::<Vec<f32>>("floats").as_deref(), Ok(&[6., 7., 8.])));
+
+		ctx.set_output(0, &ctx.inputs()[0])?;
+
+		Ok(())
+	}
+
+	fn create_kernel(&self, _: &KernelAttributes) -> crate::Result<Box<dyn Kernel>> {
+		Ok(Box::new(|ctx: &KernelContext| {
+			let x = ctx.input(0)?.ok_or_else(|| crate::Error::new("missing input"))?;
+			let (x_shape, x) = x.try_extract_raw_tensor::<f32>()?;
+			let mut z = ctx.output(0, x_shape.to_vec())?.ok_or_else(|| crate::Error::new("missing input"))?;
+			let (_, z_ref) = z.try_extract_raw_tensor_mut::<f32>()?;
+			for i in 0..x_shape.iter().copied().reduce(|acc, e| acc * e).unwrap_or(0) as usize {
+				z_ref[i] = x[i] * 2.;
+			}
+			Ok(())
+		}))
+	}
+}
+
+struct AttrTesterString;
+
+impl Operator for AttrTesterString {
+	fn name(&self) -> &str {
+		"AttrTesterString"
+	}
+
+	fn inputs(&self) -> Vec<OperatorInput> {
+		vec![OperatorInput::required(TensorElementType::Float32)]
+	}
+
+	fn outputs(&self) -> Vec<OperatorOutput> {
+		vec![OperatorOutput::required(TensorElementType::Float32)]
+	}
+
+	fn infer_shape(&self, ctx: &mut super::ShapeInferenceContext) -> crate::Result<()> {
+		assert!(matches!(ctx.attr::<String>("a_string").as_deref(), Ok("iamastring")));
+
+		ctx.set_output(0, &ctx.inputs()[0])?;
+
+		Ok(())
+	}
+
+	fn create_kernel(&self, _: &KernelAttributes) -> crate::Result<Box<dyn Kernel>> {
+		Ok(Box::new(|ctx: &KernelContext| {
+			let x = ctx.input(0)?.ok_or_else(|| crate::Error::new("missing input"))?;
+			let (x_shape, x) = x.try_extract_raw_tensor::<f32>()?;
+			let mut z = ctx.output(0, x_shape.to_vec())?.ok_or_else(|| crate::Error::new("missing input"))?;
+			let (_, z_ref) = z.try_extract_raw_tensor_mut::<f32>()?;
+			for i in 0..x_shape.iter().copied().reduce(|acc, e| acc * e).unwrap_or(0) as usize {
+				z_ref[i] = x[i] * 3.;
+			}
+			Ok(())
+		}))
+	}
+}
+
+#[test]
+fn test_op_attrs() -> crate::Result<()> {
+	let model = std::fs::read("tests/data/attr_tester.onnx").expect("");
+	let mut session = Session::builder()?
+		.with_operators(OperatorDomain::new("test.customop")?.add(AttrTesterIntFloat)?.add(AttrTesterString)?)?
+		.commit_from_memory(&model)?;
+
+	let value1 = Tensor::from_array(([5], vec![1.0_f32, 2.0, 3.0, 4.0, 5.0]))?;
+
+	let values = session.run(crate::inputs!["input_0" => &value1])?;
+	assert_eq!(values[0].try_extract_raw_tensor::<f32>()?.1, [6.0, 12.0, 18.0, 24.0, 30.0]);
+
+	Ok(())
+}
diff --git a/tests/data/attr_tester.onnx b/tests/data/attr_tester.onnx
new file mode 100644
index 00000000..c99b4116
Binary files /dev/null and b/tests/data/attr_tester.onnx differ