// Copyright 2025 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 crate::common::CommandOutput;use crate::common::TestEnvironment;use crate::common::TestWorkDir; fn create_test_environment() -> TestEnvironment {    let mut test_env = TestEnvironment::default();    test_env.add_env_var("JJ_RANDOMNESS_SEED", "0");    test_env.add_env_var("JJ_TIMESTAMP", "2001-01-01T00:00:00+00:00");    test_env.add_config("experimental.record-predecessors-in-commit = false");    test_env} #[test]fn test_identical_commits() {    let test_env = create_test_environment();    test_env.run_jj_in(".", ["git", "init", "repo"]).success();    let work_dir = test_env.work_dir("repo");     work_dir.run_jj(["new", "root()", "-m=test"]).success();    // TODO: Should not fail    insta::assert_snapshot!(work_dir.run_jj(["new", "root()", "-m=test"]), @r"    ------- stderr -------    Internal error: Unexpected error from backend    Caused by: Newly-created commit e94ed463cbb0776612e308eba2ecaae74a7f8a73 already exists    [EOF]    [exit status: 255]    ");    // There should be a single "test" commit    insta::assert_snapshot!(get_log_output(&work_dir), @r"    @  e94ed463cbb0 test    ◆  000000000000    [EOF]    ");} /// Create "test1" commit, then rewrite it in the same way "concurrently" (by/// starting at the same operation)#[test]fn test_identical_commits_concurrently() {    let test_env = create_test_environment();    test_env.run_jj_in(".", ["git", "init", "repo"]).success();    let work_dir = test_env.work_dir("repo");     work_dir.run_jj(["new", "root()", "-m=test1"]).success();    work_dir.run_jj(["describe", "-m=test2"]).success();    work_dir        .run_jj(["describe", "-m=test2", "--at-op=@-"])        .success();    // There should be a single "test2" commit    insta::assert_snapshot!(get_log_output(&work_dir), @r"    @  c5abd2256ac0 test2    ◆  000000000000    [EOF]    ------- stderr -------    Concurrent modification detected, resolving automatically.    [EOF]    ");} /// Create commit "test1", then rewrite it to "test2", then rewrite it back to/// "test1"#[test]fn test_identical_commits_by_cycling_rewrite() {    let test_env = create_test_environment();    test_env.run_jj_in(".", ["git", "init", "repo"]).success();    let work_dir = test_env.work_dir("repo");     work_dir.run_jj(["new", "root()", "-m=test1"]).success();    work_dir.run_jj(["describe", "-m=test2"]).success();    // TODO: Should not fail    insta::assert_snapshot!(work_dir.run_jj(["describe", "-m=test1"]), @r"    ------- stderr -------    Internal error: Unexpected error from backend    Caused by: Newly-created commit 053222c21fa06b9492e22346f8f70e732231ad4f already exists    [EOF]    [exit status: 255]    ");    insta::assert_snapshot!(work_dir.run_jj(["evolog"]), @r"    @  oxmtprsl test.user@example.com 2001-01-01 11:00:00 c5abd225    │  (empty) test2    │  -- operation f184243937e9 describe commit 053222c21fa06b9492e22346f8f70e732231ad4f    ○  oxmtprsl hidden test.user@example.com 2001-01-01 11:00:00 053222c2       (empty) test1       -- operation 509c18587028 new empty commit    [EOF]    ");    // TODO: Test `jj op diff --from @--`} /// Create commits "test1" and "test2" and rewrite "test1". Then rewrite "test2"/// to become identical to the rewritten "test1".#[test]fn test_identical_commits_by_convergent_rewrite() {    let test_env = create_test_environment();    test_env.run_jj_in(".", ["git", "init", "repo"]).success();    let work_dir = test_env.work_dir("repo");     work_dir.run_jj(["new", "root()", "-m=test1"]).success();    work_dir.run_jj(["new", "root()", "-m=test2"]).success();    work_dir        .run_jj(["describe", "-m=test3", "description(test1)"])        .success();    // TODO: Should not fail    insta::assert_snapshot!(work_dir.run_jj(["describe", "-m=test3", "description(test2)"]), @r"    ------- stderr -------    Internal error: Unexpected error from backend    Caused by: Newly-created commit 460733f1f6f9283d5a810b231dd3f846fd3a6f04 already exists    [EOF]    [exit status: 255]    ");    // TODO: The "test3" commit should have either "test1" or "test2" as predecessor    // (or both?)    insta::assert_snapshot!(work_dir.run_jj(["evolog"]), @r"    @  oxmtprsl?? test.user@example.com 2001-01-01 11:00:00 c5abd225       (empty) test2       -- operation a1561db9359b new empty commit    [EOF]    ");} /// Create commits "test1" and "test2" and then rewrite both of them to be/// identical in a single operation#[test]fn test_identical_commits_by_convergent_rewrite_one_operation() {    let test_env = create_test_environment();    test_env.run_jj_in(".", ["git", "init", "repo"]).success();    let work_dir = test_env.work_dir("repo");     work_dir.run_jj(["new", "root()", "-m=test1"]).success();    work_dir.run_jj(["new", "root()", "-m=test2"]).success();    // TODO: Should not fail    insta::assert_snapshot!(work_dir.run_jj(["describe", "-m=test3", "root()+"]), @r"    ------- stderr -------    Internal error: Unexpected error from backend    Caused by: Newly-created commit 460733f1f6f9283d5a810b231dd3f846fd3a6f04 already exists    [EOF]    [exit status: 255]    ");    // TODO: There should be a single "test3" commit    insta::assert_snapshot!(get_log_output(&work_dir), @r"    @  c5abd2256ac0 test2    │ ○  053222c21fa0 test1    ├─╯    ◆  000000000000    [EOF]    ");    // TODO: The "test3" commit should have either "test1" or "test2" as predecessor    // (or both?)    insta::assert_snapshot!(work_dir.run_jj(["evolog"]), @r"    @  oxmtprsl?? test.user@example.com 2001-01-01 11:00:00 c5abd225       (empty) test2       -- operation a1561db9359b new empty commit    [EOF]    ");} /// Create two stacked commits. Then reorder them so they become rewrites of/// each other.#[test]fn test_identical_commits_swap_by_reordering() {    let test_env = create_test_environment();    test_env.run_jj_in(".", ["git", "init", "repo"]).success();    let work_dir = test_env.work_dir("repo");     work_dir.run_jj(["new", "root()", "-m=test"]).success();    work_dir.run_jj(["new", "-m=test"]).success();    // Test the setup    insta::assert_snapshot!(get_log_output(&work_dir), @r"    @  5bae90c9b34d test    ○  e94ed463cbb0 test    ◆  000000000000    [EOF]    ");    // TODO: Should not fail    insta::assert_snapshot!(work_dir.run_jj(["rebase", "-r=@", "-B=@-"]), @r"    ------- stderr -------    Internal error: Unexpected error from backend    Caused by: Newly-created commit e94ed463cbb0776612e308eba2ecaae74a7f8a73 already exists    [EOF]    [exit status: 255]    ");    // There same two commits should still be visible    insta::assert_snapshot!(get_log_output(&work_dir), @r"    @  5bae90c9b34d test    ○  e94ed463cbb0 test    ◆  000000000000    [EOF]    ");    // TODO: Each commit should be a predecessor of the other    insta::assert_snapshot!(work_dir.run_jj(["evolog", "-r=@"]), @r"    @  oxmtprsl?? test.user@example.com 2001-01-01 11:00:00 5bae90c9       (empty) test       -- operation 380fbe20623e new empty commit    [EOF]    ");    insta::assert_snapshot!(work_dir.run_jj(["evolog", "-r=@-"]), @r"    ○  oxmtprsl?? test.user@example.com 2001-01-01 11:00:00 e94ed463       (empty) test       -- operation 40e37b931010 new empty commit    [EOF]    ");    // TODO: Test that `jj op show` displays something reasonable} #[must_use]fn get_log_output(work_dir: &TestWorkDir) -> CommandOutput {    let template = r#"commit_id.short() ++ " " ++ description"#;    work_dir.run_jj(["log", "-T", template])}