git fetch: add tests

tests/test_git_fetch.rs

@@ -0,0 +1,120 @@
+// Copyright 2023 The Jujutsu Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+use std::path::Path;
+
+use crate::common::TestEnvironment;
+
+pub mod common;
+
+#[test]
+fn test_git_fetch_default_remote() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+    add_git_remote(&test_env, &repo_path, "origin");
+
+    test_env.jj_cmd_success(&repo_path, &["git", "fetch"]);
+    insta::assert_snapshot!(get_branch_output(&test_env, &repo_path), @r###"
+    origin: 9f01a0e04879 message
+    "###);
+}
+
+#[test]
+fn test_git_fetch_single_remote() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+    add_git_remote(&test_env, &repo_path, "rem1");
+
+    test_env.jj_cmd_success(&repo_path, &["git", "fetch", "--remote", "rem1"]);
+    insta::assert_snapshot!(get_branch_output(&test_env, &repo_path), @r###"
+    rem1: 9f01a0e04879 message
+    "###);
+}
+
+#[test]
+fn test_git_fetch_single_remote_from_config() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+    add_git_remote(&test_env, &repo_path, "rem1");
+    test_env.add_config(r#"git.fetch = "rem1""#);
+
+    test_env.jj_cmd_success(&repo_path, &["git", "fetch"]);
+    insta::assert_snapshot!(get_branch_output(&test_env, &repo_path), @r###"
+    rem1: 9f01a0e04879 message
+    "###);
+}
+
+#[test]
+fn test_git_fetch_nonexistent_remote() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+
+    let stderr = &test_env.jj_cmd_failure(&repo_path, &["git", "fetch", "--remote", "rem1"]);
+    insta::assert_snapshot!(stderr, @r###"
+    Error: No git remote named 'rem1'
+    "###);
+    // No remote should have been fetched as part of the failing transaction
+    insta::assert_snapshot!(get_branch_output(&test_env, &repo_path), @"");
+}
+
+#[test]
+fn test_git_fetch_nonexistent_remote_from_config() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+    test_env.add_config(r#"git.fetch = "rem1""#);
+
+    let stderr = &test_env.jj_cmd_failure(&repo_path, &["git", "fetch"]);
+    insta::assert_snapshot!(stderr, @r###"
+    Error: No git remote named 'rem1'
+    "###);
+    // No remote should have been fetched as part of the failing transaction
+    insta::assert_snapshot!(get_branch_output(&test_env, &repo_path), @"");
+}
+
+/// Add a remote containing a branch with the same name
+fn add_git_remote(test_env: &TestEnvironment, repo_path: &Path, remote: &str) {
+    let git_repo_path = test_env.env_root().join(remote);
+    let git_repo = git2::Repository::init(git_repo_path).unwrap();
+    let signature =
+        git2::Signature::new("Some One", "some.one@example.com", &git2::Time::new(0, 0)).unwrap();
+    let mut tree_builder = git_repo.treebuilder(None).unwrap();
+    let file_oid = git_repo.blob(b"content").unwrap();
+    tree_builder
+        .insert("file", file_oid, git2::FileMode::Blob.into())
+        .unwrap();
+    let tree_oid = tree_builder.write().unwrap();
+    let tree = git_repo.find_tree(tree_oid).unwrap();
+    git_repo
+        .commit(
+            Some(&format!("refs/heads/{remote}")),
+            &signature,
+            &signature,
+            "message",
+            &tree,
+            &[],
+        )
+        .unwrap();
+    test_env.jj_cmd_success(
+        repo_path,
+        &["git", "remote", "add", remote, &format!("../{remote}")],
+    );
+}
+
+fn get_branch_output(test_env: &TestEnvironment, repo_path: &Path) -> String {
+    test_env.jj_cmd_success(repo_path, &["branch", "list"])
+}