fix release.toml version check

We had a mistake in bottlerocket-os#112
commit 67ef875. The check to make sure the version Release.toml matched
the release version in Twoliter.toml could never succeed due to
quotation marks around the version string.

This fixes it and adds a test to prove that it works.

twoliter/src/project.rs

@@ -226,7 +226,8 @@ impl UnvalidatedProject {
                 return Ok(());
             }
         }
-        .to_string();
+        .as_str()
+        .context("The version in Release.toml is not a string")?;
         ensure!(
             version == self.release_version,
             "The version found in Release.toml, '{version}', does not match the release-version \
@@ -328,4 +329,63 @@ mod test {
             project.toolchain("aarch64").unwrap().to_string()
         );
     }
+
+    #[tokio::test]
+    async fn test_release_toml_check_error() {
+        let tempdir = TempDir::new().unwrap();
+        let p = tempdir.path();
+        let from = data_dir();
+        let twoliter_toml_from = from.join("Twoliter-1.toml");
+        let twoliter_toml_to = p.join("Twoliter.toml");
+        let release_toml_from = from.join("Release-2.toml");
+        let release_toml_to = p.join("Release.toml");
+        fs::copy(&twoliter_toml_from, &twoliter_toml_to)
+            .await
+            .expect(&format!(
+                "Unable to copy {} to {}",
+                twoliter_toml_from.display(),
+                twoliter_toml_to.display()
+            ));
+        fs::copy(&release_toml_from, &release_toml_to)
+            .await
+            .expect(&format!(
+                "Unable to copy {} to {}",
+                release_toml_from.display(),
+                release_toml_to.display()
+            ));
+        let result = Project::find_and_load(&p).await;
+        assert!(
+            result.is_err(),
+            "Expected the loading of the project to fail because of a mismatched version in \
+            Release.toml, but the project loaded without an error."
+        );
+    }
+
+    #[tokio::test]
+    async fn test_release_toml_check_ok() {
+        let tempdir = TempDir::new().unwrap();
+        let p = tempdir.path();
+        let from = data_dir();
+        let twoliter_toml_from = from.join("Twoliter-1.toml");
+        let twoliter_toml_to = p.join("Twoliter.toml");
+        let release_toml_from = from.join("Release-1.toml");
+        let release_toml_to = p.join("Release.toml");
+        fs::copy(&twoliter_toml_from, &twoliter_toml_to)
+            .await
+            .expect(&format!(
+                "Unable to copy {} to {}",
+                twoliter_toml_from.display(),
+                twoliter_toml_to.display()
+            ));
+        fs::copy(&release_toml_from, &release_toml_to)
+            .await
+            .expect(&format!(
+                "Unable to copy {} to {}",
+                release_toml_from.display(),
+                release_toml_to.display()
+            ));
+
+        // The project should load because Release.toml and Twoliter.toml versions match.
+        Project::find_and_load(&p).await.unwrap();
+    }
 }

twoliter/src/test/data/Release-1.toml

@@ -0,0 +1 @@
+version = "1.0.0"

twoliter/src/test/data/Release-2.toml

@@ -0,0 +1 @@
+version = "2.0.0"