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use std::path::PathBuf;
use serde::Deserialize;
const DEFAULT_ARGS_PREFIX: fn() -> String = || "args:".to_string();
const DEFAULT_ARGS_AFTER_PREFIX: fn() -> String = || "args after:".to_string();
const DEFAULT_STDOUT_PREFIX: fn() -> String = || "expected stdout:".to_string();
const DEFAULT_STDERR_PREFIX: fn() -> String = || "expected stderr:".to_string();
const DEFAULT_EXIT_STATUS_PREFIX: fn() -> String = || "expected exit status:".to_string();
#[derive(Deserialize)]
pub struct TestConfig {
/// The binary path to your program, typically "target/debug/myprogram"
pub binary_path: PathBuf,
/// The path to the directory containing your tests, or a single test file.
///
/// If this is a directory, it will be searched recursively for all files.
pub test_path: PathBuf,
/// The sequence of characters starting at the beginning of a line that
/// all test options should be prefixed with. This is typically a comment
/// in your language. For example, if we had a C like language we could
/// have "// " as the test_line_prefix to allow "expected stdout:" and friends
/// to be read inside comments at the start of a line.
pub test_line_prefix: String,
/// The "args:" keyword used while parsing tests. Anything after
/// `test_line_prefix + test_args_prefix` is read in as shell arguments to
/// the program, passed before the test file path.
#[serde(default = "DEFAULT_ARGS_PREFIX")]
pub test_args_prefix: String,
/// The "args after:" keyword used while parsing tests. Anything after
/// `test_line_prefix + test_args_after_prefix` is read in as shell
/// arguments to the program, passed after the test file path.
#[serde(default = "DEFAULT_ARGS_AFTER_PREFIX")]
pub test_args_after_prefix: String,
/// The "expected stdout:" keyword used while parsing tests. Any line starting
/// with `test_line_prefix` after a line starting with `test_line_prefix + test_stdout_prefix`
/// is appended to the expected stdout output. This continues until the first
/// line that does not start with `test_line_prefix`
///
/// Example with `test_line_prefix = "// "` and `test_stdout_prefix = "expected stdout:"`
/// ```rust
/// // expected stdout:
/// // first line of stdout
/// // second line of stdout
///
/// // Normal comment, expected stdout is done being read.
/// ```
#[serde(default = "DEFAULT_STDOUT_PREFIX")]
pub test_stdout_prefix: String,
/// The "expected stderr:" keyword used while parsing tests. Any line starting
/// with `test_line_prefix` after a line starting with `test_line_prefix + test_stderr_prefix`
/// is appended to the expected stderr output. This continues until the first
/// line that does not start with `test_line_prefix`
///
/// Example with `test_line_prefix = "-- "` and `test_stderr_prefix = "expected stderr:"`
/// ```haskell
/// -- expected stderr:
/// -- first line of stderr
/// -- second line of stderr
///
/// -- Normal comment, expected stderr is done being read.
/// ```
#[serde(default = "DEFAULT_STDERR_PREFIX")]
pub test_stderr_prefix: String,
/// The "expected exit status:" keyword used while parsing tests. This will expect an
/// integer after this keyword representing the expected exit status of the given test.
///
/// Example with `test_line_prefix = "; "` and `test_exit_status_prefix = "expected exit status:"`
/// ```rust
/// // expected exit status: 0
/// ```
#[serde(default = "DEFAULT_EXIT_STATUS_PREFIX")]
pub test_exit_status_prefix: String,
/// Flag the current output as correct and regenerate the test files. This assumes the order of
/// the `goldenfiles` sections can be moved around.
#[serde(skip)]
pub overwrite_tests: bool,
/// Arguments to always include in the command-line args for testing the program.
/// For example, if this is `foo` and the test specifies `args: bar baz` then the
/// binary will be invoked via `<binary> foo bar baz <filename> <args-after>`
#[serde(default)]
pub base_args: String,
/// Arguments to always include in the command-line args for testing the program.
/// For example, if this is `foo` and the test specifies `args after: bar baz` then the
/// binary will be invoked via `<binary> <args> <filename> foo bar baz`
#[serde(default)]
pub base_args_after: String,
}
impl TestConfig {
/// Creates a new TestConfig for the given binary path, test path, and prefix.
///
/// If we were testing a C++-like language that uses `//` as its comment syntax, we
/// may want our test keywords embedded in comments. Additionally, lets say our
/// project is called "my-compiler" and our test path is "examples/goldentests".
/// In that case we can construct a `TestConfig` like so:
///
/// ```rust
/// use goldentests::TestConfig;
/// let config = TestConfig::new("target/debug/my-compiler", "examples/goldentests", "// ");
/// ```
///
/// This will give us the default keywords when parsing our test files which allows
/// us to write tests such as the following:
///
/// ```cpp
/// std::cout << "Hello, World!\n";
/// std::cerr << "Goodbye, World!\n";
///
/// // These are args to your program, so this:
/// // args: --run
/// // Gets translated to: target/debug/my-compiler --run testfile
///
/// // The expected exit status is optional, by default it is not checked.
/// // expected exit status: 0
///
/// // The expected stdout output however is mandatory. If it is omitted, it
/// // is assumed that stdout should be empty after invoking the program.
/// // expected stdout:
/// // Hello, World!
///
/// // The expected stderr output is also mandatory. If it is omitted it is
/// // likewise assumed stderr should be empty.
/// // expected stderr:
/// // Goodbye, World!
/// ```
///
/// Note that we can still embed normal comments in the program even though our test
/// line prefix was "// "! Any test line that doesn't start with a keyword like "args:"
/// or "expected stdout:" is ignored unless it is following an "expected stdout:" or
/// "expected stderr:", in which case it is appended to the expected output.
///
/// If you want to change these default keywords you can also create a TestConfig
/// via `TestConfig::with_custom_keywords` which will allow you to specify each.
#[allow(unused)]
pub fn new<Binary, Tests>(binary_path: Binary, test_path: Tests, test_line_prefix: &str) -> TestConfig
where
Binary: Into<PathBuf>,
Tests: Into<PathBuf>,
{
TestConfig::with_custom_keywords(
binary_path,
test_path,
test_line_prefix,
"args:",
"args after:",
"expected stdout:",
"expected stderr:",
"expected exit status:",
false,
)
}
/// Creates a TestConfig from reading a `goldentests.toml` configuration file.
///
/// This will use the provided path to the configuration file, if it is provided.
/// Otherwise, this will attempt to search the current directory and parent directories
/// for a config file automatically.
///
/// This function panics if the configuration file was not found or could not be read.
#[allow(unused)]
pub fn new_from_config_file(path: Option<PathBuf>) -> TestConfig {
super::config_file::read_config_file(path.clone()).unwrap_or_else(|| {
if let Some(path) = path {
panic!("Could not read from `{:?}`", path)
} else {
panic!("Could not find a `goldentests.toml` in this directory or in parent directories")
}
})
}
/// This function is provided in case you want to change the default keywords used when
/// searching through the test file. This will let you change "expected stdout:"
/// or any other keyword to "output I want ->" or any other arbitrary string so long as it
/// does not contain "\n".
///
/// If you don't want to change any of the defaults, you can use `TestConfig::new` to construct
/// a TestConfig with the default keywords (which are listed in its documentation).
pub fn with_custom_keywords<Binary, Tests>(
binary_path: Binary,
test_path: Tests,
test_line_prefix: &str,
test_args_prefix: &str,
test_args_after_prefix: &str,
test_stdout_prefix: &str,
test_stderr_prefix: &str,
test_exit_status_prefix: &str,
overwrite_tests: bool,
) -> TestConfig
where
Binary: Into<PathBuf>,
Tests: Into<PathBuf>,
{
let binary_path = binary_path.into();
let test_path = test_path.into();
let test_line_prefix = test_line_prefix.to_string();
let prefixed = |s| format!("{}{}", test_line_prefix, s);
TestConfig {
binary_path,
test_path,
test_args_prefix: prefixed(test_args_prefix),
test_args_after_prefix: prefixed(test_args_after_prefix),
test_stdout_prefix: prefixed(test_stdout_prefix),
test_stderr_prefix: prefixed(test_stderr_prefix),
test_exit_status_prefix: prefixed(test_exit_status_prefix),
test_line_prefix,
overwrite_tests,
base_args: String::new(),
base_args_after: String::new(),
}
}
}