Add test to ensure old integration branch doesn't throw

crates/gitbutler-branch-actions/tests/fixtures/for-workspace-migration.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -eu -o pipefail
+CLI=${1:?The first argument is the GitButler CLI}
+
+git init remote
+(cd remote
+  echo first > file
+  git add . && git commit -m "init"
+)
+
+export GITBUTLER_CLI_DATA_DIR=../user/gitbutler/app-data
+git clone remote workspace-migration
+(cd workspace-migration
+  $CLI project add --switch-to-workspace "$(git rev-parse --symbolic-full-name @{u})"
+  $CLI branch create virtual
+  # Start the test on the old integration branch.
+  git checkout -b gitbutler/integration
+)

crates/gitbutler-branch-actions/tests/virtual_branches/mod.rs

@@ -82,6 +82,7 @@ mod update_base_branch;
 mod update_commit_message;
 mod upstream;
 mod verify_branch;
+mod workspace_migration;
 
 #[test]
 fn resolve_conflict_flow() {

crates/gitbutler-branch-actions/tests/virtual_branches/workspace_migration.rs

@@ -0,0 +1,31 @@
+use gitbutler_branch::VirtualBranchesHandle;
+use gitbutler_branch_actions::{update_workspace_commit, verify_branch};
+use gitbutler_operating_modes::{INTEGRATION_BRANCH_REF, WORKSPACE_BRANCH_REF};
+
+/// Tests that "verify branch" won't complain if we are on the old integration
+/// branch, and that `update_workspace_commit` will put us back on the a branch
+/// with the new name.
+#[test]
+fn works_on_integration_branch() -> anyhow::Result<()> {
+    let ctx = gitbutler_testsupport::read_only::fixture(
+        "for-workspace-migration.sh",
+        "workspace-migration",
+    )?;
+    let mut guard = ctx.project().exclusive_worktree_access();
+    let perm = guard.write_permission();
+
+    // Check that we are on the old `gitbutler/integration` branch.
+    assert_eq!(
+        ctx.repository().head()?.name(),
+        Some(INTEGRATION_BRANCH_REF)
+    );
+
+    // Should not throw verification error until migration is complete.
+    let result = verify_branch(&ctx, perm);
+    assert!(result.is_ok());
+
+    // Updating workspace commit should put us on the workspace branch.
+    update_workspace_commit(&VirtualBranchesHandle::new(ctx.project().gb_dir()), &ctx)?;
+    assert_eq!(ctx.repository().head()?.name(), Some(WORKSPACE_BRANCH_REF));
+    Ok(())
+}

crates/gitbutler-operating-modes/src/lib.rs

@@ -11,7 +11,7 @@ pub mod commands;
 pub const WORKSPACE_BRANCH_REF: &str = "refs/heads/gitbutler/workspace";
 
 /// Previous workspace reference, delete after transition.
-const INTEGRATION_BRANCH_REF: &str = "refs/heads/gitbutler/integration";
+pub const INTEGRATION_BRANCH_REF: &str = "refs/heads/gitbutler/integration";
 
 /// To prevent clients hitting the "looks like you've moved away from..."
 /// after upgrading to a version using the new gitbutler/workspace branch