1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
use syn::{
parse::{Error, Parse, ParseStream, Result},
punctuated::Punctuated,
Attribute, Expr, Ident, Token,
};
use proc_macro2::TokenStream;
use quote::ToTokens;
#[derive(PartialEq, Debug)]
pub(crate) struct TestCase {
pub(crate) args: Vec<Expr>,
pub(crate) attrs: Vec<Attribute>,
pub(crate) description: Option<Ident>,
}
impl Parse for TestCase {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Attribute::parse_outer(input)?;
let case: Ident = input.parse()?;
if case == "case" {
let mut description = None;
if input.peek(Token![::]) {
let _ = input.parse::<Token![::]>();
description = Some(input.parse()?);
}
let content;
let _ = syn::parenthesized!(content in input);
let args = Punctuated::<Expr, Token![,]>::parse_terminated(&content)?
.into_iter()
.collect();
Ok(TestCase {
args,
attrs,
description,
})
} else {
Err(Error::new(case.span(), "expected a test case"))
}
}
}
impl ToTokens for TestCase {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.args.iter().for_each(|c| c.to_tokens(tokens))
}
}
#[cfg(test)]
mod should {
use super::*;
use crate::test::{assert_eq, *};
fn parse_test_case<S: AsRef<str>>(test_case: S) -> TestCase {
parse_meta(test_case)
}
#[test]
fn two_literal_args() {
let test_case = parse_test_case(r#"case(42, "value")"#);
let args = test_case.args();
let expected = to_args!(["42", r#""value""#]);
assert_eq!(expected, args);
}
#[test]
fn some_literals() {
let args_expressions = literal_expressions_str();
let test_case = parse_test_case(&format!("case({})", args_expressions.join(", ")));
let args = test_case.args();
assert_eq!(to_args!(args_expressions), args);
}
#[test]
fn accept_arbitrary_rust_code() {
let test_case = parse_test_case(r#"case(vec![1,2,3])"#);
let args = test_case.args();
assert_eq!(to_args!(["vec![1, 2, 3]"]), args);
}
#[test]
#[should_panic]
fn raise_error_on_invalid_rust_code() {
parse_test_case(r#"case(some:<>(1,2,3))"#);
}
#[test]
fn get_description_if_any() {
let test_case = parse_test_case(r#"case::this_test_description(42)"#);
let args = test_case.args();
assert_eq!(
"this_test_description",
&test_case.description.unwrap().to_string()
);
assert_eq!(to_args!(["42"]), args);
}
#[test]
fn get_description_also_with_more_args() {
let test_case = parse_test_case(r#"case :: this_test_description (42, 24)"#);
let args = test_case.args();
assert_eq!(
"this_test_description",
&test_case.description.unwrap().to_string()
);
assert_eq!(to_args!(["42", "24"]), args);
}
#[test]
fn parse_arbitrary_rust_code_as_expression() {
let test_case = parse_test_case(
r##"
case(42, -42,
pippo("pluto"),
Vec::new(),
String::from(r#"prrr"#),
{
let mut sum=0;
for i in 1..3 {
sum += i;
}
sum
},
vec![1,2,3]
)"##,
);
let args = test_case.args();
assert_eq!(
to_args!([
"42",
"-42",
r#"pippo("pluto")"#,
"Vec::new()",
r##"String::from(r#"prrr"#)"##,
r#"{let mut sum=0;for i in 1..3 {sum += i;}sum}"#,
"vec![1,2,3]"
]),
args
);
}
#[test]
fn save_attributes() {
let test_case = parse_test_case(r#"#[should_panic]#[other_attr(x)]case(42)"#);
let content = format!("{:?}", test_case.attrs);
assert_eq!(2, test_case.attrs.len());
assert!(content.contains("should_panic"));
assert!(content.contains("other_attr"));
}
}