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| 1 | +// Copyright 2024 Google LLC |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +/// Matches a value where the result of `callable` applied to the value matches |
| 16 | +/// the inner matcher. |
| 17 | +/// |
| 18 | +/// The `callable` will be called twice, so make sure it is pure. |
| 19 | +/// ``` |
| 20 | +/// # use googletest::prelude::*; |
| 21 | +/// # fn should_pass() -> googletest::Result<()> { |
| 22 | +/// # verify_that!(100, result_of!(|value| value + 1, eq(101)))?; // Passes |
| 23 | +/// # Ok(()) |
| 24 | +/// # } |
| 25 | +/// |
| 26 | +/// # fn should_fail() -> googletest::Result<()> { |
| 27 | +/// # verify_that!(100, result_of!(|value| value * 2, eq(100)))?; // Fails |
| 28 | +/// # Ok(()) |
| 29 | +/// # } |
| 30 | +/// # should_pass().unwrap(); |
| 31 | +/// # should_fail().unwrap_err(); |
| 32 | +/// ``` |
| 33 | +#[macro_export] |
| 34 | +#[doc(hidden)] |
| 35 | +macro_rules! __result_of { |
| 36 | + ($($t: tt)*) => { $crate::result_of_internal!($($t)*) }; |
| 37 | +} |
| 38 | + |
| 39 | +#[macro_export] |
| 40 | +macro_rules! result_of_internal { |
| 41 | + ($function: expr, $matcher: expr) => {{ |
| 42 | + $crate::matchers::__internal_unstable_do_not_depend_on_these::result_of( |
| 43 | + $function, |
| 44 | + $matcher, |
| 45 | + stringify!($function), |
| 46 | + ) |
| 47 | + }}; |
| 48 | +} |
| 49 | + |
| 50 | +/// Matches a value where the reference to the result of `callable` applied to |
| 51 | +/// the value matches the inner matcher. |
| 52 | +/// |
| 53 | +/// The `callable` will be called twice, so make sure it is pure. |
| 54 | +/// ``` |
| 55 | +/// # use googletest::prelude::*; |
| 56 | +/// # fn should_pass_1() -> googletest::Result<()> { |
| 57 | +/// # verify_that!("hello", result_of_ref!(|s: &str| s.to_uppercase(), eq("HELLO")))?; // Passes |
| 58 | +/// # Ok(()) |
| 59 | +/// # } |
| 60 | +/// |
| 61 | +/// # fn should_pass_2() -> googletest::Result<()> { |
| 62 | +/// # verify_that!(100, result_of_ref!(|value| value + 1, eq(&101)))?; // Passes |
| 63 | +/// # Ok(()) |
| 64 | +/// # } |
| 65 | +/// |
| 66 | +/// # fn should_fail() -> googletest::Result<()> { |
| 67 | +/// # verify_that!("world", result_of_ref!(|s: &str| s.to_uppercase(), eq("HELLO")))?; // Passes |
| 68 | +/// # Ok(()) |
| 69 | +/// # } |
| 70 | +/// # should_pass_1().unwrap(); |
| 71 | +/// # should_pass_2().unwrap(); |
| 72 | +/// # should_fail().unwrap_err(); |
| 73 | +/// ``` |
| 74 | +#[macro_export] |
| 75 | +#[doc(hidden)] |
| 76 | +macro_rules! __result_of_ref { |
| 77 | + ($($t: tt)*) => { $crate::result_of_ref_internal!($($t)*)}; |
| 78 | +} |
| 79 | + |
| 80 | +#[macro_export] |
| 81 | +macro_rules! result_of_ref_internal { |
| 82 | + ($function: expr, $matcher: expr) => {{ |
| 83 | + $crate::matchers::__internal_unstable_do_not_depend_on_these::result_of_ref( |
| 84 | + $function, |
| 85 | + $matcher, |
| 86 | + stringify!($function), |
| 87 | + ) |
| 88 | + }}; |
| 89 | +} |
| 90 | + |
| 91 | +/// Items for use only by the declarative macros in this module. |
| 92 | +/// |
| 93 | +/// **For internal use only. API stability is not guaranteed!** |
| 94 | +#[doc(hidden)] |
| 95 | +pub mod internal { |
| 96 | + use crate::description::Description; |
| 97 | + use crate::matcher::{Matcher, MatcherBase, MatcherResult}; |
| 98 | + use std::fmt::Debug; |
| 99 | + |
| 100 | + pub fn result_of<Callable, InnerMatcher>( |
| 101 | + callable: Callable, |
| 102 | + inner_matcher: InnerMatcher, |
| 103 | + callable_description: &'static str, |
| 104 | + ) -> ResultOfMatcher<Callable, InnerMatcher> { |
| 105 | + ResultOfMatcher { callable, inner_matcher, callable_description } |
| 106 | + } |
| 107 | + |
| 108 | + #[derive(MatcherBase)] |
| 109 | + pub struct ResultOfMatcher<Callable, InnerMatcher> { |
| 110 | + callable: Callable, |
| 111 | + inner_matcher: InnerMatcher, |
| 112 | + callable_description: &'static str, |
| 113 | + } |
| 114 | + |
| 115 | + impl<I: Copy + Debug, T: Debug + Copy, CallableT: Fn(I) -> T, InnerMatcherT: Matcher<T>> |
| 116 | + Matcher<I> for ResultOfMatcher<CallableT, InnerMatcherT> |
| 117 | + { |
| 118 | + fn matches(&self, actual: I) -> MatcherResult { |
| 119 | + self.inner_matcher.matches((self.callable)(actual)) |
| 120 | + } |
| 121 | + |
| 122 | + fn describe(&self, matcher_result: MatcherResult) -> Description { |
| 123 | + self.inner_matcher.describe(matcher_result) |
| 124 | + } |
| 125 | + |
| 126 | + fn explain_match(&self, actual: I) -> Description { |
| 127 | + let actual_result = (self.callable)(actual); |
| 128 | + format!( |
| 129 | + "where the result of applying {actual:?} to the callable `{}` is {actual_result:?} which {}", |
| 130 | + self.callable_description, |
| 131 | + self.describe(self.inner_matcher.matches(actual_result)) |
| 132 | + ) |
| 133 | + .into() |
| 134 | + } |
| 135 | + } |
| 136 | + |
| 137 | + pub fn result_of_ref<Callable, InnerMatcher>( |
| 138 | + callable: Callable, |
| 139 | + inner_matcher: InnerMatcher, |
| 140 | + callable_description: &'static str, |
| 141 | + ) -> ResultOfRefMatcher<Callable, InnerMatcher> { |
| 142 | + ResultOfRefMatcher { callable, inner_matcher, callable_description } |
| 143 | + } |
| 144 | + #[derive(MatcherBase)] |
| 145 | + pub struct ResultOfRefMatcher<Callable, InnerMatcher> { |
| 146 | + callable: Callable, |
| 147 | + inner_matcher: InnerMatcher, |
| 148 | + callable_description: &'static str, |
| 149 | + } |
| 150 | + |
| 151 | + impl< |
| 152 | + I: Copy + Debug, |
| 153 | + T: Debug, |
| 154 | + Callable: Fn(I) -> T, |
| 155 | + InnerMatcherT: for<'a> Matcher<&'a T>, |
| 156 | + > Matcher<I> for ResultOfRefMatcher<Callable, InnerMatcherT> |
| 157 | + { |
| 158 | + fn matches(&self, actual: I) -> MatcherResult { |
| 159 | + self.inner_matcher.matches(&(self.callable)(actual)) |
| 160 | + } |
| 161 | + |
| 162 | + fn describe(&self, matcher_result: MatcherResult) -> Description { |
| 163 | + self.inner_matcher.describe(matcher_result) |
| 164 | + } |
| 165 | + |
| 166 | + fn explain_match(&self, actual: I) -> Description { |
| 167 | + let actual_result = (self.callable)(actual); |
| 168 | + Description::new().text(format!("where the result of applying {actual:?} to the callable `{}` is {actual_result:?}", self.callable_description)).nested(self.inner_matcher.explain_match(&actual_result)) |
| 169 | + } |
| 170 | + } |
| 171 | +} |
| 172 | + |
| 173 | +#[cfg(test)] |
| 174 | +mod tests { |
| 175 | + use crate::prelude::*; |
| 176 | + |
| 177 | + #[test] |
| 178 | + fn result_of_match_with_value() -> Result<()> { |
| 179 | + verify_that!(1, result_of!(|value| value + 1, eq(2))) |
| 180 | + } |
| 181 | + |
| 182 | + #[test] |
| 183 | + fn result_of_match_with_value_function() -> Result<()> { |
| 184 | + fn inc_by_one(value: i32) -> i32 { |
| 185 | + value + 1 |
| 186 | + } |
| 187 | + verify_that!(1, result_of!(inc_by_one, eq(2))) |
| 188 | + } |
| 189 | + |
| 190 | + #[test] |
| 191 | + fn result_of_match_with_different_value() -> Result<()> { |
| 192 | + let result = verify_that!(0, result_of!(|value| value - 1, eq(2))); |
| 193 | + verify_that!( |
| 194 | + result, |
| 195 | + err(displays_as(contains_substring( |
| 196 | + "where the result of applying 0 to the callable `|value| value - 1` is -1 which isn't equal to 2" |
| 197 | + ))) |
| 198 | + ) |
| 199 | + } |
| 200 | + |
| 201 | + #[test] |
| 202 | + fn result_of_match_with_different_value_block_closure() -> Result<()> { |
| 203 | + let result = verify_that!(0, result_of!(|value| { value - 1 }, eq(2))); |
| 204 | + verify_that!( |
| 205 | + result, |
| 206 | + err(displays_as(contains_substring( |
| 207 | + "where the result of applying 0 to the callable `|value| { value - 1 }` is -1 which isn't equal to 2" |
| 208 | + ))) |
| 209 | + ) |
| 210 | + } |
| 211 | + |
| 212 | + #[test] |
| 213 | + fn result_of_match_with_different_value_multiline_closure() -> Result<()> { |
| 214 | + let result = verify_that!( |
| 215 | + 0, |
| 216 | + result_of!( |
| 217 | + |value| { |
| 218 | + let dec = value - 1; |
| 219 | + let inc = dec + 1; |
| 220 | + inc - 2 |
| 221 | + }, |
| 222 | + eq(2) |
| 223 | + ) |
| 224 | + ); |
| 225 | + verify_that!( |
| 226 | + result, |
| 227 | + err(displays_as(contains_substring( |
| 228 | + "where the result of applying 0 to the callable `|value| { let dec = value - 1; let inc = dec + 1; inc - 2 }` is -2 which isn't equal to 2" |
| 229 | + ))) |
| 230 | + ) |
| 231 | + } |
| 232 | + |
| 233 | + #[test] |
| 234 | + fn result_of_match_with_different_value_function() -> Result<()> { |
| 235 | + fn dec_by_one(value: i32) -> i32 { |
| 236 | + value - 1 |
| 237 | + } |
| 238 | + let result = verify_that!(0, result_of!(dec_by_one, eq(2))); |
| 239 | + verify_that!( |
| 240 | + result, |
| 241 | + err(displays_as(contains_substring( |
| 242 | + "where the result of applying 0 to the callable `dec_by_one` is -1 which isn't equal to 2" |
| 243 | + ))) |
| 244 | + ) |
| 245 | + } |
| 246 | + |
| 247 | + #[test] |
| 248 | + fn result_of_ref_match_with_string_reference() -> Result<()> { |
| 249 | + verify_that!("hello", result_of_ref!(|s: &str| s.to_uppercase(), eq("HELLO"))) |
| 250 | + } |
| 251 | + |
| 252 | + #[test] |
| 253 | + fn result_of_ref_match_with_string_reference_function() -> Result<()> { |
| 254 | + fn to_upper_case<S: AsRef<str>>(s: S) -> String { |
| 255 | + s.as_ref().to_uppercase() |
| 256 | + } |
| 257 | + verify_that!("hello", result_of_ref!(to_upper_case, eq("HELLO"))) |
| 258 | + } |
| 259 | + |
| 260 | + #[test] |
| 261 | + fn result_of_ref_match_with_copy_types() -> Result<()> { |
| 262 | + verify_that!(100, result_of_ref!(|value| value + 1, eq(&101))) |
| 263 | + } |
| 264 | + |
| 265 | + #[test] |
| 266 | + fn result_of_ref_match_with_different_value() -> Result<()> { |
| 267 | + let result = verify_that!("world", result_of_ref!(|s: &str| s.to_uppercase(), eq("HELLO"))); |
| 268 | + verify_that!( |
| 269 | + result, |
| 270 | + err(displays_as(contains_substring( |
| 271 | + "where the result of applying \"world\" to the callable `|s: &str| s.to_uppercase()` is \"WORLD\"\n which isn't equal to \"HELLO\"" |
| 272 | + ))) |
| 273 | + ) |
| 274 | + } |
| 275 | + |
| 276 | + #[test] |
| 277 | + fn result_of_ref_match_with_different_value_block_closure() -> Result<()> { |
| 278 | + let result = |
| 279 | + verify_that!("world", result_of_ref!(|s: &str| { s.to_uppercase() }, eq("HELLO"))); |
| 280 | + verify_that!( |
| 281 | + result, |
| 282 | + err(displays_as(contains_substring( |
| 283 | + "where the result of applying \"world\" to the callable `|s: &str| { s.to_uppercase() }` is \"WORLD\"\n which isn't equal to \"HELLO\"" |
| 284 | + ))) |
| 285 | + ) |
| 286 | + } |
| 287 | + |
| 288 | + #[test] |
| 289 | + fn result_of_ref_match_with_different_value_function() -> Result<()> { |
| 290 | + fn to_upper_case<S: AsRef<str>>(s: S) -> String { |
| 291 | + s.as_ref().to_uppercase() |
| 292 | + } |
| 293 | + let result = verify_that!("world", result_of_ref!(to_upper_case, eq("HELLO"))); |
| 294 | + verify_that!( |
| 295 | + result, |
| 296 | + err(displays_as(contains_substring( |
| 297 | + "where the result of applying \"world\" to the callable `to_upper_case` is \"WORLD\"\n which isn't equal to \"HELLO\"" |
| 298 | + ))) |
| 299 | + ) |
| 300 | + } |
| 301 | + |
| 302 | + #[test] |
| 303 | + fn result_of_ref_match_different_with_closure_variable() -> Result<()> { |
| 304 | + let to_upper_case = |s: &str| s.to_uppercase(); |
| 305 | + let result = verify_that!("world", result_of_ref!(to_upper_case, eq("HELLO"))); |
| 306 | + verify_that!( |
| 307 | + result, |
| 308 | + err(displays_as(contains_substring( |
| 309 | + "where the result of applying \"world\" to the callable `to_upper_case` is \"WORLD\"\n which isn't equal to \"HELLO\"" |
| 310 | + ))) |
| 311 | + ) |
| 312 | + } |
| 313 | + |
| 314 | + #[test] |
| 315 | + fn result_of_ref_match_different_with_method_literal() -> Result<()> { |
| 316 | + let result = verify_that!("world", result_of_ref!(str::to_uppercase, eq("HELLO"))); |
| 317 | + verify_that!( |
| 318 | + result, |
| 319 | + err(displays_as(contains_substring( |
| 320 | + "where the result of applying \"world\" to the callable `str::to_uppercase` is \"WORLD\"\n which isn't equal to \"HELLO\"" |
| 321 | + ))) |
| 322 | + ) |
| 323 | + } |
| 324 | + |
| 325 | + #[test] |
| 326 | + fn result_of_ref_match_different_with_function_return_closure() -> Result<()> { |
| 327 | + fn upper_case() -> impl Fn(&str) -> String { |
| 328 | + |s: &str| s.to_uppercase() |
| 329 | + } |
| 330 | + let result = verify_that!("world", result_of_ref!(upper_case(), eq("HELLO"))); |
| 331 | + verify_that!( |
| 332 | + result, |
| 333 | + err(displays_as(contains_substring( |
| 334 | + "where the result of applying \"world\" to the callable `upper_case()` is \"WORLD\"\n which isn't equal to \"HELLO\"" |
| 335 | + ))) |
| 336 | + ) |
| 337 | + } |
| 338 | +} |
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