(set-version) tests: add test for failing to set version because of m…

…issing workspace-wide version key

tests/cmd/set-version/set-workspace-version-no-version.in/Cargo.toml

@@ -0,0 +1,7 @@
+[workspace.package]
+# no version key
+
+[workspace]
+members = [
+    "lib-member",
+]

tests/cmd/set-version/set-workspace-version-no-version.in/lib-member/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "lib-member"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

tests/cmd/set-version/set-workspace-version-no-version.in/lib-member/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

tests/cmd/set-version/set-workspace-version-no-version.toml

@@ -0,0 +1,11 @@
+bin.name = "cargo-set-version"
+args = ["set-version", "--workspace-version", "2.0.0"]
+status = "failed"
+stdout = ""
+stderr = """
+Error: '[CWD]/Cargo.toml' does not have a `workspace.package.version` key, bumping/setting the workspace-wide version is not possible
+"""
+fs.sandbox = true
+
+[env.add]
+CARGO_IS_TEST="1"