storage: clean up test code

src/storage/bitcask.rs

@@ -360,14 +360,15 @@ impl Log {
     }
 }
 
+/// Most storage tests are Goldenscripts under src/storage/testscripts.
 #[cfg(test)]
 mod tests {
     use super::super::engine::test::Runner;
     use super::*;
     use crate::encoding::format::{self, Formatter as _};
-    use std::error::Error as StdError;
+
     use std::fmt::Write as _;
-    use std::result::Result as StdResult;
+    use std::{error::Error as StdError, result::Result as StdResult};
     use test_case::test_case;
     use test_each_file::test_each_path;
 

src/storage/engine.rs

@@ -88,12 +88,12 @@ impl Status {
 pub mod test {
     use super::*;
     use crate::encoding::format::{self, Formatter as _};
+
     use crossbeam::channel::Sender;
     use itertools::Itertools as _;
     use regex::Regex;
-    use std::error::Error as StdError;
     use std::fmt::Write as _;
-    use std::result::Result as StdResult;
+    use std::{error::Error as StdError, result::Result as StdResult};
 
     /// Goldenscript runner for engines. All engines use a common set of
     /// goldenscripts in src/storage/testscripts/engine, as well as their own
@@ -142,7 +142,8 @@ pub mod test {
                         self.engine.scan(range).try_collect()?
                     };
                     for (key, value) in items {
-                        writeln!(output, "{}", format::Raw::key_value(&key, &value))?;
+                        let fmtkv = format::Raw::key_value(&key, &value);
+                        writeln!(output, "{fmtkv}")?;
                     }
                 }
 
@@ -153,7 +154,8 @@ pub mod test {
                     args.reject_rest()?;
                     let mut scan = self.engine.scan_prefix(&prefix);
                     while let Some((key, value)) = scan.next().transpose()? {
-                        writeln!(output, "{}", format::Raw::key_value(&key, &value))?;
+                        let fmtkv = format::Raw::key_value(&key, &value);
+                        writeln!(output, "{fmtkv}")?;
                     }
                 }
 

src/storage/memory.rs

@@ -83,10 +83,12 @@ impl<'a> DoubleEndedIterator for ScanIterator<'a> {
     }
 }
 
+/// Most storage tests are Goldenscripts under src/storage/testscripts.
 #[cfg(test)]
 mod tests {
     use super::super::engine::test::Runner;
     use super::*;
+
     use test_each_file::test_each_path;
 
     // Run common goldenscript tests in src/storage/testscripts/engine.

src/storage/mod.rs

@@ -1,3 +1,6 @@
+//! Key/value storage engines, including an MVCC transaction layer. For
+//! details, see the `engine`, `bitcask`, and `mvcc` module documentation.
+
 mod bitcask;
 pub mod engine;
 mod memory;

src/storage/mvcc.rs

@@ -742,6 +742,7 @@ impl<'a, I: engine::ScanIterator> Iterator for VersionIterator<'a, I> {
     }
 }
 
+/// Most storage tests are Goldenscripts under src/storage/testscripts.
 #[cfg(test)]
 pub mod tests {
     use super::*;
@@ -826,6 +827,8 @@ pub mod tests {
     impl goldenscript::Runner for MVCCRunner {
         fn run(&mut self, command: &goldenscript::Command) -> Result<String, Box<dyn Error>> {
             let mut output = String::new();
+            let mut tags = command.tags.clone();
+
             match command.name.as_str() {
                 // txn: begin [readonly] [as_of=VERSION]
                 "begin" => {
@@ -961,7 +964,7 @@ pub mod tests {
                         parse_key_range(args.next_pos().map(|a| a.value.as_str()).unwrap_or(".."))?;
                     args.reject_rest()?;
 
-                    let kvs: Vec<_> = txn.scan(range).collect::<crate::error::Result<_>>()?;
+                    let kvs: Vec<_> = txn.scan(range).try_collect()?;
                     for (key, value) in kvs {
                         writeln!(output, "{}", format::Raw::key_value(&key, &value))?;
                     }
@@ -974,8 +977,7 @@ pub mod tests {
                     let prefix = decode_binary(&args.next_pos().ok_or("prefix not given")?.value);
                     args.reject_rest()?;
 
-                    let kvs: Vec<_> =
-                        txn.scan_prefix(&prefix).collect::<crate::error::Result<_>>()?;
+                    let kvs: Vec<_> = txn.scan_prefix(&prefix).try_collect()?;
                     for (key, value) in kvs {
                         writeln!(output, "{}", format::Raw::key_value(&key, &value))?;
                     }
@@ -1020,49 +1022,41 @@ pub mod tests {
                 }
 
                 // status
-                "status" => {
-                    let status = self.mvcc.status()?;
-                    writeln!(output, "{status:#?}")?;
-                }
+                "status" => writeln!(output, "{:#?}", self.mvcc.status()?)?,
 
                 name => return Err(format!("invalid command {name}").into()),
             }
-            Ok(output)
-        }
 
-        /// If requested via [ops] tag, output engine operations for the command.
-        fn end_command(
-            &mut self,
-            command: &goldenscript::Command,
-        ) -> Result<String, Box<dyn Error>> {
-            // Parse tags.
-            let mut show_ops = false;
-            for tag in &command.tags {
-                match tag.as_str() {
-                    "ops" => show_ops = true,
-                    tag => return Err(format!("invalid tag {tag}").into()),
+            // If requested, output engine operations.
+            if tags.remove("ops") {
+                while let Ok(op) = self.op_rx.try_recv() {
+                    match op {
+                        Operation::Delete { key } => {
+                            let fmtkey = format::MVCC::<format::Raw>::key(&key);
+                            let rawkey = format::Raw::key(&key);
+                            writeln!(output, "engine delete {fmtkey} [{rawkey}]")?
+                        }
+                        Operation::Flush => writeln!(output, "engine flush")?,
+                        Operation::Set { key, value } => {
+                            let fmtkv = format::MVCC::<format::Raw>::key_value(&key, &value);
+                            let rawkv = format::Raw::key_value(&key, &value);
+                            writeln!(output, "engine set {fmtkv} [{rawkv}]")?
+                        }
+                    }
                 }
             }
 
-            // Process engine operations, either output or drain.
-            let mut output = String::new();
-            while let Ok(op) = self.op_rx.try_recv() {
-                match op {
-                    _ if !show_ops => {}
-                    Operation::Delete { key } => {
-                        let fmtkey = format::MVCC::<format::Raw>::key(&key);
-                        let rawkey = format::Raw::key(&key);
-                        writeln!(output, "engine delete {fmtkey} [{rawkey}]")?
-                    }
-                    Operation::Flush => writeln!(output, "engine flush")?,
-                    Operation::Set { key, value } => {
-                        let fmtkv = format::MVCC::<format::Raw>::key_value(&key, &value);
-                        let rawkv = format::Raw::key_value(&key, &value);
-                        writeln!(output, "engine set {fmtkv} [{rawkv}]")?
-                    }
-                }
+            if let Some(tag) = tags.iter().next() {
+                return Err(format!("unknown tag {tag}").into());
             }
+
             Ok(output)
         }
+
+        // Drain unhandled engine operations.
+        fn end_command(&mut self, _: &goldenscript::Command) -> Result<String, Box<dyn Error>> {
+            while self.op_rx.try_recv().is_ok() {}
+            Ok(String::new())
+        }
     }
 }