Test that the new debuginfo options match between cargo and rustc

Author: jyn514

tests/testsuite/build.rs

@@ -4,6 +4,7 @@ use cargo::{
     core::compiler::CompileMode,
     core::{Shell, Workspace},
     ops::CompileOptions,
+    util::toml::TomlDebugInfo,
     Config,
 };
 use cargo_test_support::compare;
@@ -6407,3 +6408,44 @@ fn renamed_uplifted_artifact_remains_unmodified_after_rebuild() {
     let not_the_same = !same_file::is_same_file(bin, renamed_bin).unwrap();
     assert!(not_the_same, "renamed uplifted artifact must be unmodified");
 }
+
+#[cargo_test(nightly, reason = "debug options stabilized in 1.70")]
+fn debug_options_valid() {
+    use serde::Serialize;
+    use TomlDebugInfo::*;
+
+    for option in [
+        TomlDebugInfo::None,
+        LineDirectivesOnly,
+        LineTablesOnly,
+        Limited,
+        Full,
+    ] {
+        let option_serialized = {
+            let mut buf = String::new();
+            option
+                .serialize(toml::ser::ValueSerializer::new(&mut buf))
+                .unwrap();
+            buf
+        };
+        let p = project()
+            .file(
+                "Cargo.toml",
+                &format!(
+                    r#"
+                    [package]
+                    name = "foo"
+                    authors = []
+                    version = "0.0.0"
+
+                    [profile.dev]
+                    debug = {option_serialized}
+                "#
+                ),
+            )
+            .file("src/main.rs", "fn main() {}")
+            .build();
+
+        p.cargo("build").run();
+    }
+}