The version test asserts the fact instead of a copy of it

.github/workflows/ci.yml

@@ -171,6 +171,13 @@ jobs:
       - name: Test devlaunch-core
         working-directory: rust
         run: timeout 600 cargo test --locked -p devlaunch-core -- --test-threads=1 --nocapture
+      # The steps here name one crate each, which is what lets each carry its own
+      # timeout -- and what silently left this one uncovered. Its tests are the
+      # fake devpod the integration suites use as their whole devpod, so a
+      # fidelity gap in it is the one way a fake can do real harm.
+      - name: Test devlaunch-test-support
+        working-directory: rust
+        run: timeout 300 cargo test --locked -p devlaunch-test-support -- --test-threads=1 --nocapture
       - name: Test aid (bins + rewrite)
         working-directory: rust
         run: timeout 300 cargo test --locked -p aid --bins --test rewrite -- --test-threads=1 --nocapture

rust/devlaunch-test-support/src/lib.rs

@@ -30,8 +30,25 @@ pub use response::Response;
 
 #[cfg(test)]
 mod tests {
+    /// This crate carries the workspace's version rather than one of its own.
+    ///
+    /// Asserted against `Cargo.toml` rather than against a literal. A literal is
+    /// the same claim written in a way that has to be hand-edited every release
+    /// and fails nothing until someone runs the one command that reaches it:
+    /// `version.workspace = true` is what makes `CARGO_PKG_VERSION` the
+    /// workspace's, so comparing that variable to a hardcoded string only ever
+    /// tests whether the string was updated. It was not, at 0.3.1 --
+    /// `cargo test --workspace` failed on a clean tree, and CI never saw it,
+    /// because its rust job names the crates it tests one at a time and this is
+    /// not among them.
     #[test]
     fn versioned_with_the_workspace() {
-        assert_eq!(env!("CARGO_PKG_VERSION"), "0.3.0");
+        let manifest = include_str!("../Cargo.toml");
+        assert!(
+            manifest
+                .lines()
+                .any(|line| line.split_whitespace().collect::<String>() == "version.workspace=true"),
+            "devlaunch-test-support must take the workspace version, not name one of its own:\n{manifest}"
+        );
     }
 }