move tests around and add (non working) benchmark

backend/test_utils/src/workspace/commands.rs

@@ -0,0 +1,46 @@
+//! Commands that we can use when running `cargo test` style tests in this workspace
+//! that want to test the current code.
+use crate::server::Command;
+use std::path::PathBuf;
+
+/// Runs `cargo run` in the current workspace to start up a telemetry shard process.
+///
+/// Note: The CWD must be somewhere within this backend workspace for the command to work.
+pub fn cargo_run_telemetry_shard(release_mode: bool) -> Result<Command, std::io::Error> {
+    telemetry_command("telemetry_shard", release_mode)
+}
+
+/// Runs `cargo run` in the current workspace to start up a telemetry core process.
+///
+/// Note: The CWD must be somewhere within this backend workspace for the command to work.
+pub fn cargo_run_telemetry_core(release_mode: bool) -> Result<Command, std::io::Error> {
+    telemetry_command("telemetry_core", release_mode)
+}
+
+fn telemetry_command(bin: &'static str, release_mode: bool) -> Result<Command, std::io::Error> {
+    let mut workspace_dir = try_find_workspace_dir()?;
+    workspace_dir.push("Cargo.toml");
+
+    let mut cmd = Command::new("cargo").arg("run");
+
+    // Release mode?
+    if release_mode {
+        cmd = cmd.arg("--release");
+    }
+
+    cmd = cmd.arg("--bin")
+        .arg(bin)
+        .arg("--manifest-path")
+        .arg(workspace_dir)
+        .arg("--");
+
+    Ok(cmd)
+}
+
+/// A _very_ naive way to find the workspace ("backend") directory
+/// from the current path (which is assumed to be inside it).
+fn try_find_workspace_dir() -> Result<PathBuf, std::io::Error> {
+    let mut dir = std::env::current_dir()?;
+    while !dir.ends_with("backend") && dir.pop() {}
+    Ok(dir)
+}