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Copy pathwrite_tests.rs
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2155 lines (1903 loc) · 73.2 KB
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use super::*;
#[cfg(feature = "cli")]
use crate::cli::global::GlobalFlags;
use std::fs;
#[cfg(feature = "cli")]
fn test_global_flags() -> GlobalFlags {
GlobalFlags::test_default()
}
mod detect_eol_tests {
use super::*;
#[test]
fn detect_eol_lf_only() {
assert_eq!(detect_eol("line1\nline2\nline3\n"), "\n");
}
#[test]
fn detect_eol_crlf_only() {
assert_eq!(detect_eol("line1\r\nline2\r\nline3\r\n"), "\r\n");
}
#[test]
fn detect_eol_mixed_crlf_dominant() {
assert_eq!(detect_eol("line1\r\nline2\nline3\r\n"), "\r\n");
}
#[test]
fn detect_eol_mixed_lf_dominant() {
assert_eq!(detect_eol("line1\nline2\r\nline3\n"), "\n");
}
#[test]
fn detect_eol_empty_string() {
assert_eq!(detect_eol(""), "\n");
}
#[test]
fn detect_eol_no_newlines() {
assert_eq!(detect_eol("no newlines here"), "\n");
}
#[test]
fn detect_eol_cr_only() {
assert_eq!(detect_eol("line1\rline2\r"), "\r");
}
#[test]
fn has_mixed_eol_detects_crlf_and_lf() {
assert!(has_mixed_eol(b"a\nb\r\n"));
assert!(!has_mixed_eol(b"a\nb\n"));
assert!(!has_mixed_eol(b"a\r\nb\r\n"));
}
#[test]
fn unmix_eol_flattens_to_majority() {
let lf = unmix_eol("a\nb\r\nc\n");
assert_eq!(lf.as_ref(), "a\nb\nc\n");
let crlf = unmix_eol("a\r\nb\nc\r\n");
assert_eq!(crlf.as_ref(), "a\r\nb\r\nc\r\n");
assert!(matches!(unmix_eol("a\nb\n"), std::borrow::Cow::Borrowed(_)));
}
}
mod basic {
use super::*;
#[test]
fn ensure_final_newline_adds_when_missing() {
assert_eq!(ensure_final_newline("hello", EolMode::Keep), "hello\n");
}
#[test]
fn parse_eol_mode_cr() {
assert!(matches!(parse_eol_mode("cr").unwrap(), EolMode::Cr));
}
#[test]
fn trim_trailing_whitespace_removes_spaces() {
let result = trim_trailing_whitespace("hello \nworld\t\n");
assert_eq!(result, "hello\nworld\n");
assert!(
matches!(result, std::borrow::Cow::Owned(_)),
"trimmed content should be Cow::Owned"
);
}
#[test]
fn trim_trailing_whitespace_clean_returns_borrowed() {
let result = trim_trailing_whitespace("hello\nworld\n");
assert_eq!(result, "hello\nworld\n");
assert!(
matches!(result, std::borrow::Cow::Borrowed(_)),
"clean content should return Cow::Borrowed, not allocate"
);
}
#[test]
fn noop_policy_returns_borrowed() {
let policy = WritePolicy::default();
let input = "hello\nworld\n";
let result = apply_policy(input, &policy);
assert!(
matches!(result, std::borrow::Cow::Borrowed(_)),
"no-op policy should return Cow::Borrowed"
);
assert_eq!(&*result, input);
}
#[test]
fn apply_policy_chains_all() {
let policy = WritePolicy {
trim_trailing_whitespace: true,
normalize_eol: EolMode::Lf,
ensure_final_newline: true,
..Default::default()
};
// Trailing whitespace, CRLF endings, no final newline.
let input = "hello \r\nworld\t\r\n";
let result = apply_policy(input, &policy);
// After trim: "hello\r\nworld\r\n"
// After LF: "hello\nworld\n"
// After final newline: already ends with \n → unchanged.
assert_eq!(result, "hello\nworld\n");
}
#[test]
fn atomic_write_writes_correct_content() {
let dir = tempfile::tempdir().unwrap();
let target = dir.path().join("output.txt");
let policy = WritePolicy {
ensure_final_newline: true,
normalize_eol: EolMode::Lf,
trim_trailing_whitespace: true,
..Default::default()
};
atomic_write(&target, "foo \r\nbar", &policy).unwrap();
let got = fs::read_to_string(&target).unwrap();
assert_eq!(got, "foo\nbar\n");
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_explicit_flags_win() {
let dir = tempfile::tempdir().unwrap();
let ec_path = dir.path().join(".editorconfig");
fs::write(
&ec_path,
"root = true\n\n[*]\ninsert_final_newline = false\nend_of_line = crlf\ntrim_trailing_whitespace = false\n",
)
.unwrap();
let file = dir.path().join("test.txt");
fs::write(&file, "content\n").unwrap();
let mut global = test_global_flags();
global.respect_editorconfig = true;
global.ensure_final_newline = true;
global.normalize_eol = Some(EolMode::Lf);
global.trim_trailing_whitespace = true;
let policy = policy_from_flags(&global, Some(&file));
// Explicit flags should win over EditorConfig values.
assert!(policy.ensure_final_newline);
assert!(matches!(policy.normalize_eol, EolMode::Lf));
assert!(policy.trim_trailing_whitespace);
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_editorconfig_provides_defaults() {
let dir = tempfile::tempdir().unwrap();
let ec_path = dir.path().join(".editorconfig");
fs::write(
&ec_path,
"root = true\n\n[*]\ninsert_final_newline = true\nend_of_line = lf\ntrim_trailing_whitespace = true\n",
)
.unwrap();
let file = dir.path().join("test.txt");
fs::write(&file, "content\n").unwrap();
let mut global = test_global_flags();
global.respect_editorconfig = true;
let policy = policy_from_flags(&global, Some(&file));
assert!(policy.ensure_final_newline);
assert!(matches!(policy.normalize_eol, EolMode::Lf));
assert!(policy.trim_trailing_whitespace);
}
#[test]
fn noop_policy_detected() {
assert!(WritePolicy::default().is_noop());
}
#[test]
fn non_noop_policy_detected() {
let p = WritePolicy {
ensure_final_newline: true,
..Default::default()
};
assert!(!p.is_noop());
let p2 = WritePolicy {
normalize_eol: EolMode::Lf,
..Default::default()
};
assert!(!p2.is_noop());
let p3 = WritePolicy {
trim_trailing_whitespace: true,
..Default::default()
};
assert!(!p3.is_noop());
}
#[test]
fn atomic_create_new_writes_content() {
let dir = tempfile::tempdir().unwrap();
let target = dir.path().join("new.txt");
let policy = WritePolicy {
ensure_final_newline: true,
normalize_eol: EolMode::Lf,
trim_trailing_whitespace: false,
..Default::default()
};
atomic_create_new(&target, "hello", &policy).unwrap();
let got = fs::read_to_string(&target).unwrap();
assert_eq!(got, "hello\n");
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_no_editorconfig_uses_defaults() {
let global = test_global_flags();
let policy = policy_from_flags(&global, None);
assert!(!policy.ensure_final_newline);
assert!(matches!(policy.normalize_eol, EolMode::Keep));
assert!(!policy.trim_trailing_whitespace);
}
#[test]
fn collapse_blanks_reduces_consecutive_blanks() {
let input = "line1\n\n\n\nline2\n\n\nline3\n";
let result = collapse_blanks(input);
assert_eq!(result, "line1\n\nline2\n\nline3\n");
}
#[test]
fn collapse_blanks_no_change_returns_borrowed() {
let input = "line1\n\nline2\nline3\n";
let result = collapse_blanks(input);
assert_eq!(result, input);
assert!(
matches!(result, std::borrow::Cow::Borrowed(_)),
"no-change should return Cow::Borrowed"
);
}
#[test]
fn apply_policy_collapse_blanks() {
let policy = WritePolicy {
collapse_blanks: true,
..Default::default()
};
let input = "a\n\n\nb\n";
let result = apply_policy(input, &policy);
assert_eq!(result, "a\n\nb\n");
}
#[test]
fn write_policy_override_full() {
let mut policy = WritePolicy::default();
let ov = WritePolicyOverride {
ensure_final_newline: Some(true),
normalize_eol: Some("lf".to_string()),
trim_trailing_whitespace: Some(true),
collapse_blanks: Some(true),
respect_editorconfig: Some(true),
};
policy.apply_override(&ov).unwrap();
assert!(policy.ensure_final_newline);
assert!(matches!(policy.normalize_eol, EolMode::Lf));
assert!(policy.trim_trailing_whitespace);
assert!(policy.collapse_blanks);
}
#[test]
fn write_policy_override_partial() {
let mut policy = WritePolicy::default();
let ov = WritePolicyOverride {
ensure_final_newline: Some(true),
..Default::default()
};
policy.apply_override(&ov).unwrap();
assert!(policy.ensure_final_newline);
// Other fields stay at defaults.
assert!(matches!(policy.normalize_eol, EolMode::Keep));
assert!(!policy.trim_trailing_whitespace);
assert!(!policy.collapse_blanks);
}
#[test]
fn write_policy_override_lf() {
let mut policy = WritePolicy::default();
let ov = WritePolicyOverride {
normalize_eol: Some("lf".to_string()),
..Default::default()
};
policy.apply_override(&ov).unwrap();
assert!(matches!(policy.normalize_eol, EolMode::Lf));
}
#[test]
fn write_policy_override_crlf() {
let mut policy = WritePolicy::default();
let ov = WritePolicyOverride {
normalize_eol: Some("crlf".to_string()),
..Default::default()
};
policy.apply_override(&ov).unwrap();
assert!(matches!(policy.normalize_eol, EolMode::Crlf));
}
#[test]
fn write_policy_override_cr() {
let mut policy = WritePolicy::default();
let ov = WritePolicyOverride {
normalize_eol: Some("cr".to_string()),
..Default::default()
};
policy.apply_override(&ov).unwrap();
assert!(matches!(policy.normalize_eol, EolMode::Cr));
}
}
mod line_endings {
use super::*;
#[test]
fn ensure_final_newline_cr_mode_appends_cr() {
assert_eq!(ensure_final_newline("hello\r", EolMode::Cr), "hello\r");
assert_eq!(ensure_final_newline("hello", EolMode::Cr), "hello\r");
}
#[test]
fn ensure_final_newline_cr_mode_does_not_append_lf() {
// Content ending with \r should NOT get a \n appended
let result = ensure_final_newline("line1\rline2\r", EolMode::Cr);
assert!(result.ends_with('\r'));
assert!(!result.ends_with('\n'));
}
#[test]
fn ensure_final_newline_crlf_mode_appends_crlf() {
assert_eq!(
ensure_final_newline("hello\r\n", EolMode::Crlf),
"hello\r\n"
);
assert_eq!(ensure_final_newline("hello", EolMode::Crlf), "hello\r\n");
}
#[test]
fn ensure_final_newline_crlf_mode_bare_lf_gets_crlf() {
// Content ending with bare \n should get \r\n appended (not kept as-is)
assert_eq!(
ensure_final_newline("hello\n", EolMode::Crlf),
"hello\n\r\n"
);
}
#[test]
fn ensure_final_newline_lf_mode_unchanged() {
assert_eq!(ensure_final_newline("hello", EolMode::Lf), "hello\n");
assert_eq!(ensure_final_newline("hello\n", EolMode::Lf), "hello\n");
}
#[test]
fn normalize_eol_lf_converts_crlf() {
assert_eq!(normalize_eol("a\r\nb\r\n", EolMode::Lf), "a\nb\n");
}
#[test]
fn normalize_eol_crlf_converts_lf() {
assert_eq!(normalize_eol("a\nb\n", EolMode::Crlf), "a\r\nb\r\n");
}
#[test]
fn normalize_eol_crlf_bare_lf_at_position_zero() {
// Exercises the `i == 0` branch in the memchr single-pass scan.
assert_eq!(normalize_eol("\na\n", EolMode::Crlf), "\r\na\r\n");
}
#[test]
fn normalize_eol_crlf_mixed_content() {
// Some lines already CRLF, some bare LF — only bare LFs get \r.
assert_eq!(
normalize_eol("a\r\nb\nc\r\n", EolMode::Crlf),
"a\r\nb\r\nc\r\n"
);
}
#[test]
fn normalize_eol_crlf_already_correct_returns_borrowed() {
use std::borrow::Cow;
let content = "a\r\nb\r\n";
let result = normalize_eol(content, EolMode::Crlf);
assert!(
matches!(result, Cow::Borrowed(_)),
"all-CRLF content should return Cow::Borrowed"
);
}
#[test]
fn normalize_eol_keep_unchanged() {
let content = "a\r\nb\nc\n";
assert_eq!(normalize_eol(content, EolMode::Keep), content);
}
#[test]
fn normalize_eol_cr_converts_lf() {
assert_eq!(normalize_eol("a\nb\n", EolMode::Cr), "a\rb\r");
}
#[test]
fn normalize_eol_cr_converts_crlf() {
assert_eq!(normalize_eol("a\r\nb\r\n", EolMode::Cr), "a\rb\r");
}
#[test]
fn normalize_eol_cr_mixed_input() {
assert_eq!(normalize_eol("a\r\nb\nc\r\n", EolMode::Cr), "a\rb\rc\r");
}
#[test]
fn normalize_eol_cr_already_correct_returns_borrowed() {
use std::borrow::Cow;
let content = "a\rb\r";
let result = normalize_eol(content, EolMode::Cr);
assert!(
matches!(result, Cow::Borrowed(_)),
"all-CR content should return Cow::Borrowed"
);
}
#[test]
fn normalize_eol_lf_also_strips_bare_cr() {
// LF mode should convert both \r\n and bare \r to \n.
assert_eq!(normalize_eol("a\rb\r\nc\n", EolMode::Lf), "a\nb\nc\n");
}
#[test]
fn normalize_eol_crlf_converts_bare_cr() {
// Bare \r (classic Mac) should become \r\n.
assert_eq!(normalize_eol("a\rb\r", EolMode::Crlf), "a\r\nb\r\n");
}
#[test]
fn normalize_eol_crlf_mixed_with_bare_cr() {
// Mix of bare \r, \r\n, and bare \n should all become \r\n.
assert_eq!(
normalize_eol("a\rb\r\nc\n", EolMode::Crlf),
"a\r\nb\r\nc\r\n"
);
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_editorconfig_cr() {
let dir = tempfile::tempdir().unwrap();
let ec_path = dir.path().join(".editorconfig");
fs::write(&ec_path, "root = true\n\n[*]\nend_of_line = cr\n").unwrap();
let file = dir.path().join("test.txt");
fs::write(&file, "content\n").unwrap();
let mut global = test_global_flags();
global.respect_editorconfig = true;
let policy = policy_from_flags(&global, Some(&file));
assert!(
matches!(policy.normalize_eol, EolMode::Cr),
"end_of_line = cr should map to EolMode::Cr"
);
}
#[test]
fn apply_charset_utf8_bom_inserts_mark() {
assert_eq!(
apply_charset("hello\n", CharsetMode::Utf8Bom),
"\u{feff}hello\n"
);
assert_eq!(
apply_charset("\u{feff}hello\n", CharsetMode::Utf8Bom),
"\u{feff}hello\n"
);
}
#[test]
fn apply_charset_utf8_strips_mark() {
assert_eq!(
apply_charset("\u{feff}hello\n", CharsetMode::Utf8),
"hello\n"
);
assert_eq!(apply_charset("hello\n", CharsetMode::Utf8), "hello\n");
}
#[test]
fn apply_policy_utf8_bom_after_eol() {
let policy = WritePolicy {
charset: CharsetMode::Utf8Bom,
..Default::default()
};
assert_eq!(apply_policy("hello\n", &policy), "\u{feff}hello\n");
assert!(!policy.is_noop());
}
#[test]
fn apply_policy_empty_utf8_bom_then_final_newline() {
let policy = WritePolicy {
charset: CharsetMode::Utf8Bom,
ensure_final_newline: true,
normalize_eol: EolMode::Lf,
..Default::default()
};
assert_eq!(apply_policy("", &policy), "\u{feff}\n");
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_editorconfig_utf8_bom() {
let dir = tempfile::tempdir().unwrap();
fs::write(
dir.path().join(".editorconfig"),
"root = true\n\n[*]\ncharset = utf-8-bom\nend_of_line = lf\n",
)
.unwrap();
let file = dir.path().join("x.txt");
fs::write(&file, "hello\n").unwrap();
let mut global = test_global_flags();
global.respect_editorconfig = true;
let policy = policy_from_flags(&global, Some(&file));
assert_eq!(policy.charset, CharsetMode::Utf8Bom);
assert_eq!(apply_policy("hello\n", &policy), "\u{feff}hello\n");
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_editorconfig_utf8_does_not_insert_bom() {
let dir = tempfile::tempdir().unwrap();
fs::write(
dir.path().join(".editorconfig"),
"root = true\n\n[*]\ncharset = utf-8\n",
)
.unwrap();
let file = dir.path().join("x.txt");
fs::write(&file, "hello\n").unwrap();
let mut global = test_global_flags();
global.respect_editorconfig = true;
let policy = policy_from_flags(&global, Some(&file));
assert_eq!(policy.charset, CharsetMode::Utf8);
assert_eq!(apply_policy("hello\n", &policy), "hello\n");
assert_eq!(apply_policy("\u{feff}hello\n", &policy), "hello\n");
}
#[test]
#[cfg(feature = "cli")]
fn policy_from_flags_editorconfig_utf16le_is_unsupported() {
let dir = tempfile::tempdir().unwrap();
fs::write(
dir.path().join(".editorconfig"),
"root = true\n\n[*]\ncharset = utf-16le\n",
)
.unwrap();
let file = dir.path().join("x.txt");
fs::write(&file, "hello\n").unwrap();
let mut global = test_global_flags();
global.respect_editorconfig = true;
let policy = policy_from_flags(&global, Some(&file));
assert_eq!(policy.charset, CharsetMode::Unsupported("utf-16le"));
let err = policy.refuse_unsupported_charset().expect_err("utf-16le");
assert!(
err.to_string().contains("utf-16le"),
"refuse should name charset: {err}"
);
}
#[test]
fn trim_trailing_whitespace_crlf_endings() {
let result = trim_trailing_whitespace("hello \r\nworld\t\r\n");
assert_eq!(result, "hello\r\nworld\r\n");
}
#[test]
fn trim_trailing_whitespace_cr_endings() {
let result = trim_trailing_whitespace("hello \rworld\t\r");
assert_eq!(result, "hello\rworld\r");
assert!(matches!(result, std::borrow::Cow::Owned(_)));
}
#[test]
fn trim_trailing_whitespace_cr_clean_returns_borrowed() {
let result = trim_trailing_whitespace("hello\rworld\r");
assert_eq!(result, "hello\rworld\r");
assert!(
matches!(result, std::borrow::Cow::Borrowed(_)),
"clean CR content should return Cow::Borrowed"
);
}
#[test]
fn trim_trailing_whitespace_cr_mixed_whitespace() {
// Tabs and spaces before CR endings.
let result = trim_trailing_whitespace("a \t\rb \r");
assert_eq!(result, "a\rb\r");
}
#[test]
fn trim_trailing_whitespace_cr_no_trailing_newline() {
// Last line with trailing whitespace, no line ending.
let result = trim_trailing_whitespace("hello\rworld ");
assert_eq!(result, "hello\rworld");
}
#[test]
fn collapse_blanks_cr_endings() {
let input = "line1\r\r\r\rline2\r\r\rline3\r";
let result = collapse_blanks(input);
assert_eq!(result, "line1\r\rline2\r\rline3\r");
}
#[test]
fn collapse_blanks_cr_no_change_returns_borrowed() {
let input = "line1\r\rline2\rline3\r";
let result = collapse_blanks(input);
assert_eq!(result, input);
assert!(
matches!(result, std::borrow::Cow::Borrowed(_)),
"no-change CR content should return Cow::Borrowed"
);
}
#[test]
fn collapse_blanks_crlf_endings() {
let input = "line1\r\n\r\n\r\n\r\nline2\r\n";
let result = collapse_blanks(input);
assert_eq!(result, "line1\r\n\r\nline2\r\n");
}
#[test]
fn collapse_blanks_cr_whitespace_only_lines_are_blank() {
let input = "line1\r \r\t\r\rline2\r";
let result = collapse_blanks(input);
// " " and "\t" and "" are all blank; three consecutive blanks become one.
assert_eq!(result, "line1\r \rline2\r");
}
#[test]
fn apply_policy_cr_mode_final_newline_is_cr() {
let policy = WritePolicy {
ensure_final_newline: true,
normalize_eol: EolMode::Cr,
..Default::default()
};
// Content without a trailing newline: should get \r appended.
let result = apply_policy("hello", &policy);
assert_eq!(result, "hello\r");
assert!(!result.ends_with('\n'), "CR mode must not append \\n");
}
#[test]
fn apply_policy_crlf_mode_final_newline_is_crlf() {
let policy = WritePolicy {
ensure_final_newline: true,
normalize_eol: EolMode::Crlf,
..Default::default()
};
let result = apply_policy("hello", &policy);
assert_eq!(result, "hello\r\n");
}
#[test]
fn apply_policy_cr_mode_multiline_final_newline() {
let policy = WritePolicy {
ensure_final_newline: true,
normalize_eol: EolMode::Cr,
..Default::default()
};
// Input has LF line endings; normalize converts to CR, then final \r appended.
let result = apply_policy("a\nb", &policy);
assert_eq!(result, "a\rb\r");
}
#[test]
fn apply_policy_cr_mode_collapse_blanks() {
let policy = WritePolicy {
collapse_blanks: true,
normalize_eol: EolMode::Cr,
..Default::default()
};
// Input with LF endings; after normalize_eol they become CR.
// Then collapse_blanks must still detect and collapse consecutive blank lines.
let input = "a\n\n\nb\n";
let result = apply_policy(input, &policy);
assert_eq!(result, "a\r\rb\r");
}
#[test]
fn apply_policy_cr_mode_trim_and_collapse() {
let policy = WritePolicy {
trim_trailing_whitespace: true,
collapse_blanks: true,
normalize_eol: EolMode::Cr,
ensure_final_newline: true,
charset: crate::write::CharsetMode::Keep,
};
// Full pipeline: trim trailing ws, normalize to CR, collapse blanks, ensure final \r.
let input = "hello \n\n\nworld\t\n";
let result = apply_policy(input, &policy);
// After trim: "hello\n\n\nworld\n"
// After CR normalize: "hello\r\r\rworld\r"
// After collapse: "hello\r\rworld\r"
// After final newline: already ends with \r
assert_eq!(result, "hello\r\rworld\r");
}
}
mod edge_cases {
use super::*;
#[test]
fn ensure_final_newline_empty_stays_empty() {
assert_eq!(ensure_final_newline("", EolMode::Keep), "");
}
#[test]
fn ensure_final_newline_no_double_add() {
assert_eq!(ensure_final_newline("hello\n", EolMode::Keep), "hello\n");
}
#[test]
fn trim_trailing_whitespace_eof_without_newline() {
let result = trim_trailing_whitespace("hello ");
assert_eq!(result, "hello");
}
#[test]
fn collapse_blanks_whitespace_only_lines_are_blank() {
let input = "line1\n \n\t\n\nline2\n";
let result = collapse_blanks(input);
// " " and "\t" and "" are all blank; three consecutive blanks become one.
assert_eq!(result, "line1\n \nline2\n");
}
#[test]
fn collapse_blanks_no_blanks() {
let input = "line1\nline2\nline3\n";
let result = collapse_blanks(input);
assert_eq!(result, input);
}
#[test]
fn ensure_final_newline_keep_mode_uses_crlf_for_crlf_content() {
// #1175: Keep mode should detect dominant EOL and use it,
// not hardcode \n which introduces mixed endings.
let input = "line1\r\nline2\r\n";
let result = ensure_final_newline(input, EolMode::Keep);
// Already ends with \r\n, should be unchanged.
assert_eq!(result, input);
}
#[test]
fn ensure_final_newline_keep_mode_appends_crlf_for_crlf_content() {
// #1175: CRLF content missing final newline should get \r\n, not \n.
let input = "line1\r\nline2";
let result = ensure_final_newline(input, EolMode::Keep);
assert_eq!(result, "line1\r\nline2\r\n");
assert!(result.ends_with("\r\n"));
}
#[test]
fn ensure_final_newline_keep_mode_appends_lf_for_lf_content() {
// #1175: LF content should still get \n in Keep mode.
let input = "line1\nline2";
let result = ensure_final_newline(input, EolMode::Keep);
assert_eq!(result, "line1\nline2\n");
}
#[test]
fn collapse_blanks_trailing_blank_no_newline() {
// Two consecutive blank lines where the last has no trailing newline.
// The fast-scan must detect this to trigger collapsing.
// The first blank line is preserved (with its newline); the second is dropped.
let input = "a\n \n ";
let result = collapse_blanks(input);
assert_eq!(result, "a\n \n");
}
}
mod dedent_indent {
use super::*;
// #2378: an unusable spec must be a typed error, not a silent no-op.
#[test]
fn parse_dedent_spec_accepts_valid_forms() {
assert_eq!(parse_dedent_spec("auto").unwrap(), IndentSpec::Auto);
assert_eq!(parse_dedent_spec("tab").unwrap(), IndentSpec::Tab);
assert_eq!(parse_dedent_spec("4").unwrap(), IndentSpec::Spaces(4));
assert_eq!(
parse_dedent_spec("0").unwrap(),
IndentSpec::Spaces(0),
"0 is a deliberate no-op, not an error"
);
}
#[test]
fn parse_dedent_spec_rejects_garbage_as_invalid_input() {
for spec in ["abc", "2.5", "", "4x", "-2", " 4"] {
let err = parse_dedent_spec(spec).unwrap_err();
assert!(
err.to_string().contains("invalid --dedent value"),
"unexpected message for {spec:?}: {err}"
);
assert!(
crate::exit::is_invalid_input(&err),
"invalid --dedent must be typed InvalidInputError for JSON error_kind ({spec:?})"
);
}
}
#[test]
fn parse_indent_spec_accepts_valid_forms() {
assert_eq!(parse_indent_spec("tab").unwrap(), IndentSpec::Tab);
assert_eq!(parse_indent_spec("4").unwrap(), IndentSpec::Spaces(4));
assert_eq!(parse_indent_spec("0").unwrap(), IndentSpec::Spaces(0));
}
#[test]
fn parse_indent_spec_rejects_auto() {
let err = parse_indent_spec("auto").unwrap_err();
assert!(
err.to_string().contains("applies to --dedent only"),
"message should explain why auto is invalid here: {err}"
);
assert!(crate::exit::is_invalid_input(&err));
}
#[test]
fn parse_indent_spec_rejects_garbage_as_invalid_input() {
for spec in ["abc", "2.5", "", "4x"] {
let err = parse_indent_spec(spec).unwrap_err();
assert!(
err.to_string().contains("invalid --indent value"),
"unexpected message for {spec:?}: {err}"
);
assert!(crate::exit::is_invalid_input(&err));
}
}
#[test]
fn dedent_content_treats_invalid_spec_as_noop_for_library_callers() {
// The infallible signature is kept for compatibility; every patchloom
// entry point validates with parse_dedent_spec first.
assert_eq!(dedent_content(" x\n", "abc", None), " x\n");
assert_eq!(indent_content("x\n", "abc", None), "x\n");
}
#[test]
fn dedent_auto_removes_minimum_indent() {
let input = " line1\n line2\n line3\n";
let result = dedent_content(input, "auto", None);
assert_eq!(result, "line1\n line2\nline3\n");
}
#[test]
fn dedent_auto_skips_blank_lines() {
let input = " line1\n\n line2\n";
let result = dedent_content(input, "auto", None);
assert_eq!(result, "line1\n\nline2\n");
}
#[test]
fn dedent_auto_no_indent_returns_unchanged() {
let input = "line1\nline2\n";
let result = dedent_content(input, "auto", None);
assert_eq!(result, input);
}
#[test]
fn dedent_numeric_removes_n_spaces() {
let input = " line1\n line2\n";
let result = dedent_content(input, "4", None);
assert_eq!(result, " line1\nline2\n");
}
#[test]
fn dedent_numeric_stops_at_available_indent() {
let input = " line1\n line2\n";
let result = dedent_content(input, "4", None);
assert_eq!(result, "line1\n line2\n");
}
#[test]
fn dedent_tab_removes_one_tab() {
let input = "\tline1\n\t\tline2\nline3\n";
let result = dedent_content(input, "tab", None);
assert_eq!(result, "line1\n\tline2\nline3\n");
}
#[test]
fn dedent_tab_no_tab_unchanged() {
let input = " line1\n";
let result = dedent_content(input, "tab", None);
assert_eq!(result, " line1\n");
}
#[test]
fn dedent_auto_tab_indented_file() {
// Auto dedent must handle tab-indented files, not just space-indented.
let input = "\t\tline1\n\t\t\tline2\n\t\tline3\n";
let result = dedent_content(input, "auto", None);
assert_eq!(result, "line1\n\tline2\nline3\n");
}
#[test]
fn dedent_with_line_range() {
let input = " line1\n line2\n line3\n line4\n";
let result = dedent_content(input, "4", Some((2, Some(3))));
assert_eq!(result, " line1\nline2\nline3\n line4\n");
}
#[test]
fn indent_numeric_adds_spaces() {
let input = "line1\nline2\n";
let result = indent_content(input, "4", None);
assert_eq!(result, " line1\n line2\n");
}
#[test]
fn indent_tab_adds_tab() {
let input = "line1\nline2\n";
let result = indent_content(input, "tab", None);
assert_eq!(result, "\tline1\n\tline2\n");
}
#[test]
fn indent_skips_blank_lines() {
let input = "line1\n\nline2\n";
let result = indent_content(input, "4", None);
assert_eq!(result, " line1\n\n line2\n");
}
#[test]
fn indent_with_line_range() {
let input = "line1\nline2\nline3\nline4\n";
let result = indent_content(input, "4", Some((2, Some(3))));
assert_eq!(result, "line1\n line2\n line3\nline4\n");
}
#[test]
fn indent_zero_returns_unchanged() {
let input = "line1\nline2\n";
let result = indent_content(input, "0", None);
assert_eq!(result, input);
}
#[test]
fn dedent_auto_line_range() {
// Only dedent lines 2-3; leave lines 1 and 4 alone.
let input = " a\n b\n c\n d\n";
let result = dedent_content(input, "auto", Some((2, Some(3))));
// min indent in range (lines 2-3) is 8 spaces, so remove 8.
assert_eq!(result, " a\nb\nc\n d\n");
}
#[test]
fn indent_content_existing_bom_stays_leading() {
let result = indent_content("\u{feff}hello\n", "4", None);
assert_eq!(result, "\u{feff} hello\n");
}
#[test]
fn dedent_content_existing_bom_stays_leading() {
let result = dedent_content("\u{feff} hello\n", "4", None);
assert_eq!(result, "\u{feff}hello\n");
}
#[test]