43 lines
2.0 KiB
Rust
43 lines
2.0 KiB
Rust
//! Opt-in test of the embedded-preview read path on a **real file the user has** — typically one on a
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//! network share, which is where reading only the header instead of the whole raw matters:
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//!
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//! LC_PREVIEW_RAW="/run/user/1000/gvfs/smb-share:.../DSCF0001.RAF" \
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//! cargo test --release -p lightcraft-engine --test preview_read -- --ignored --nocapture
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//!
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//! It reports what the preview cost and fails when the read is not the small part of the file the
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//! header path promises. Skipped without `LC_PREVIEW_RAW` (there is no committed raw fixture: media
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//! is never committed, see AGENTS.md).
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use std::time::Instant;
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#[test]
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#[ignore = "needs LC_PREVIEW_RAW pointing at a real raw file"]
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fn a_preview_reads_only_the_header_and_the_preview() {
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let Ok(path) = std::env::var("LC_PREVIEW_RAW") else {
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eprintln!("skipped: set LC_PREVIEW_RAW=<path to a raw file>");
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return;
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};
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let file_len = std::fs::metadata(&path).expect("the file exists").len();
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assert!(file_len > 0, "empty file");
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let started = Instant::now();
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let window =
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lightcraft_engine::files::preview_window(&path).expect("the file reads").expect("it carries an embedded preview the header can point at");
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let elapsed = started.elapsed();
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let (_, preview, read) = window;
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let frac = read.fraction();
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println!(
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"preview of {path}\n read {} of {} bytes ({:.1} %) in {:.2} s{}",
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read.read,
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read.total,
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frac * 100.0,
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elapsed.as_secs_f64(),
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if read.header_path { " [header path]" } else { " [whole file]" }
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);
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assert!(read.header_path, "the header path must answer for a raw whose pointer is in its header");
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assert_eq!(read.total, file_len, "the report covers the whole file");
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assert!(frac < 0.5, "a preview must not cost most of the file: read {} of {} bytes", read.read, read.total);
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assert!(preview.starts_with(&[0xff, 0xd8]), "the preview bytes are a JPEG: {:?}", preview.get(..4));
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}
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