use crate::comment::TestCaseComment;
use crate::expr::{TestCaseExpression, TestCaseResult};
use crate::utils::fmt_syn;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use syn::parse::{Parse, ParseStream};
use syn::punctuated::Punctuated;
use syn::{parse_quote, Error, Expr, Ident, ItemFn, ReturnType, Token};
#[derive(Debug)]
pub struct TestCase {
args: Punctuated<Expr, Token![,]>,
expression: Option<TestCaseExpression>,
comment: Option<TestCaseComment>,
}
impl Parse for TestCase {
fn parse(input: ParseStream) -> Result<Self, Error> {
Ok(Self {
args: Punctuated::parse_separated_nonempty_with(input, Expr::parse)?,
expression: input.parse().ok(),
comment: input.parse().ok(),
})
}
}
impl TestCase {
pub fn test_case_name(&self) -> Ident {
let case_desc = self
.comment
.as_ref()
.map(|item| item.comment.value())
.unwrap_or_else(|| {
let mut acc = String::new();
for arg in &self.args {
acc.push_str(&fmt_syn(&arg));
acc.push('_');
}
acc.push_str("expects");
if let Some(expression) = &self.expression {
acc.push(' ');
acc.push_str(&expression.to_string())
}
acc
});
crate::utils::escape_test_name(case_desc)
}
pub fn render(&self, mut item: ItemFn) -> TokenStream2 {
let item_name = item.sig.ident.clone();
let arg_values = self.args.iter();
let test_case_name = self.test_case_name();
let mut attrs = self
.expression
.as_ref()
.map(|expr| expr.attributes())
.unwrap_or_else(Vec::new);
attrs.push(parse_quote! { #[allow(clippy::bool_assert_comparison)] });
attrs.append(&mut item.attrs);
let (mut signature, body) = if item.sig.asyncness.is_some() {
(
quote! { async },
quote! { let _result = super::#item_name(#(#arg_values),*).await; },
)
} else {
attrs.insert(0, parse_quote! { #[::core::prelude::v1::test] });
(
TokenStream2::new(),
quote! { let _result = super::#item_name(#(#arg_values),*); },
)
};
let expected = if let Some(expr) = self.expression.as_ref() {
attrs.extend(expr.attributes());
signature.extend(quote! { fn #test_case_name() });
if let TestCaseResult::Panicking(_) = expr.result {
TokenStream2::new()
} else {
expr.assertion()
}
} else {
signature.extend(if let ReturnType::Type(_, typ) = item.sig.output {
quote! { fn #test_case_name() -> #typ }
} else {
quote! { fn #test_case_name() }
});
quote! { _result }
};
quote! {
#(#attrs)*
#signature {
#body
#expected
}
}
}
}