test(git): add more fetch-index backend interop

Co-authored-by: Ed Page <eopage@gmail.com>

Author: weihanglo

tests/testsuite/git_shallow.rs

@@ -344,6 +344,36 @@ fn gitoxide_fetch_shallow_index_then_git2_fetch_complete() -> anyhow::Result<()>
     )
 }
 
+#[cargo_test]
+fn gitoxide_fetch_shallow_index_then_git_cli_fetch_shallow() -> anyhow::Result<()> {
+    fetch_index_then_fetch(
+        Backend::Gitoxide,
+        RepoMode::Shallow,
+        Backend::GitCli,
+        RepoMode::Shallow,
+    )
+}
+
+#[cargo_test]
+fn gitoxide_fetch_complete_index_then_git_cli_fetch_shallow() -> anyhow::Result<()> {
+    fetch_index_then_fetch(
+        Backend::Gitoxide,
+        RepoMode::Complete,
+        Backend::GitCli,
+        RepoMode::Shallow,
+    )
+}
+
+#[cargo_test]
+fn gitoxide_fetch_shallow_index_then_git_cli_fetch_complete() -> anyhow::Result<()> {
+    fetch_index_then_fetch(
+        Backend::Gitoxide,
+        RepoMode::Shallow,
+        Backend::GitCli,
+        RepoMode::Complete,
+    )
+}
+
 #[cargo_test]
 fn git_cli_fetch_shallow_index_then_git2_fetch_complete() -> anyhow::Result<()> {
     fetch_index_then_fetch(
@@ -354,6 +384,36 @@ fn git_cli_fetch_shallow_index_then_git2_fetch_complete() -> anyhow::Result<()>
     )
 }
 
+#[cargo_test]
+fn git_cli_fetch_shallow_index_then_gitoxide_fetch_shallow() -> anyhow::Result<()> {
+    fetch_index_then_fetch(
+        Backend::GitCli,
+        RepoMode::Shallow,
+        Backend::Gitoxide,
+        RepoMode::Shallow,
+    )
+}
+
+#[cargo_test]
+fn git_cli_fetch_shallow_complete_then_gitoxide_fetch_complete() -> anyhow::Result<()> {
+    fetch_index_then_fetch(
+        Backend::GitCli,
+        RepoMode::Complete,
+        Backend::Gitoxide,
+        RepoMode::Shallow,
+    )
+}
+
+#[cargo_test]
+fn git_cli_fetch_shallow_index_then_gitoxide_fetch_complete() -> anyhow::Result<()> {
+    fetch_index_then_fetch(
+        Backend::GitCli,
+        RepoMode::Shallow,
+        Backend::Gitoxide,
+        RepoMode::Complete,
+    )
+}
+
 fn fetch_index_then_fetch(
     backend_1st: Backend,
     mode_1st: RepoMode,