diff --git a/crates/mother-cli/src/commands/scan/tests/mod.rs b/crates/mother-cli/src/commands/scan/tests/mod.rs
index a229b40..e1ad1c6 100644
--- a/crates/mother-cli/src/commands/scan/tests/mod.rs
+++ b/crates/mother-cli/src/commands/scan/tests/mod.rs
@@ -3,4 +3,5 @@
 mod tests_connect_neo4j;
 mod tests_create_scan_run;
 mod tests_execute_scan;
+mod tests_log_scan_run_info;
 mod tests_shutdown_lsp;
diff --git a/crates/mother-cli/src/commands/scan/tests/tests_log_scan_run_info.rs b/crates/mother-cli/src/commands/scan/tests/tests_log_scan_run_info.rs
new file mode 100644
index 0000000..b4508cd
--- /dev/null
+++ b/crates/mother-cli/src/commands/scan/tests/tests_log_scan_run_info.rs
@@ -0,0 +1,547 @@
+//! Comprehensive tests for `log_scan_run_info` function
+//!
+//! Tests the logging of scan run information with various configurations including:
+//! - Commit SHA handling (empty vs non-empty)
+//! - Branch information (Some vs None)
+//! - Special characters in values
+//! - Edge cases and boundary conditions
+//! - Log format verification
+
+#![allow(clippy::expect_used)] // Tests can use expect for setup
+
+use chrono::Utc;
+use mother_core::graph::model::ScanRun;
+use tempfile::TempDir;
+
+use super::super::{create_scan_run, log_scan_run_info};
+
+// ============================================================================
+// Test Constants
+// ============================================================================
+
+/// Valid 40-character hexadecimal commit SHA for testing
+const VALID_FULL_COMMIT_SHA: &str = "a1b2c3d4e5f6789012345678901234567890abcd";
+
+// ============================================================================
+// Basic Functionality Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_empty_commit_sha() {
+    // Create a scan run without git info (no commit SHA)
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    let (scan_run, commit_sha) = create_scan_run(path, None);
+
+    // In a non-git directory, commit_sha should be empty
+    assert_eq!(commit_sha, "");
+
+    // Function should not panic with empty commit SHA
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_git_commit_sha() {
+    // Create a git repo to get a real commit SHA
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    // Initialize a git repository
+    let repo = git2::Repository::init(path).expect("Failed to init git repo");
+    let sig =
+        git2::Signature::now("Test User", "test@example.com").expect("Failed to create signature");
+    let tree_id = {
+        let mut index = repo.index().expect("Failed to get index");
+        index.write_tree().expect("Failed to write tree")
+    };
+    let tree = repo.find_tree(tree_id).expect("Failed to find tree");
+
+    repo.commit(Some("HEAD"), &sig, &sig, "Initial commit", &tree, &[])
+        .expect("Failed to create commit");
+
+    let (scan_run, commit_sha) = create_scan_run(path, None);
+
+    // Should have a commit SHA in a git repo
+    assert!(!commit_sha.is_empty());
+
+    // Function should not panic with valid commit SHA
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_branch_some() {
+    // Create a git repo with a branch
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    let repo = git2::Repository::init(path).expect("Failed to init git repo");
+    let sig =
+        git2::Signature::now("Test User", "test@example.com").expect("Failed to create signature");
+    let tree_id = {
+        let mut index = repo.index().expect("Failed to get index");
+        index.write_tree().expect("Failed to write tree")
+    };
+    let tree = repo.find_tree(tree_id).expect("Failed to find tree");
+
+    repo.commit(Some("HEAD"), &sig, &sig, "Initial commit", &tree, &[])
+        .expect("Failed to create commit");
+
+    let (scan_run, commit_sha) = create_scan_run(path, None);
+
+    // Should have branch set in a git repo
+    assert!(scan_run.branch.is_some());
+
+    // Function should not panic with branch set
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_branch_none() {
+    // Create a scan run without git info (no branch)
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    let (scan_run, commit_sha) = create_scan_run(path, None);
+
+    // In a non-git directory, branch should be None
+    assert_eq!(scan_run.branch, None);
+
+    // Function should not panic with branch None
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+// ============================================================================
+// Commit SHA Format Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_short_commit_sha() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "abc1234";
+
+    // Function should handle short commit SHA
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_full_length_commit_sha() {
+    let scan_run = create_minimal_scan_run();
+
+    // Function should handle full-length SHA
+    log_scan_run_info(&scan_run, VALID_FULL_COMMIT_SHA);
+}
+
+#[test]
+fn test_log_scan_run_info_with_typical_git_sha() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "a1b2c3d4e5f6789012345678901234567890abcd";
+
+    // Function should handle typical git SHA format
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+// ============================================================================
+// Branch Format Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_main_branch() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("main".to_string());
+    let commit_sha = "abc123";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_feature_branch() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("feature/add-tests".to_string());
+    let commit_sha = "def456";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_branch_with_special_chars() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("fix/issue-#123_urgent!".to_string());
+    let commit_sha = "ghi789";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_unicode_branch_name() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("功能/测试-🚀".to_string());
+    let commit_sha = "jkl012";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_empty_branch_string() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some(String::new());
+    let commit_sha = "mno345";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_very_long_branch_name() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("feature/".to_string() + &"very-long-name-".repeat(20));
+    let commit_sha = "pqr678";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+// ============================================================================
+// Scan Run ID Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_uuid_format_id() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "abc123";
+
+    // Verify ID is in UUID format
+    assert_eq!(scan_run.id.len(), 36);
+    assert_eq!(scan_run.id.matches('-').count(), 4);
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_different_scan_run_ids() {
+    let scan_run1 = create_minimal_scan_run();
+    let scan_run2 = create_minimal_scan_run();
+    let commit_sha = "def456";
+
+    // Different scan runs should have different IDs
+    assert_ne!(scan_run1.id, scan_run2.id);
+
+    // Both should log successfully
+    log_scan_run_info(&scan_run1, commit_sha);
+    log_scan_run_info(&scan_run2, commit_sha);
+}
+
+// ============================================================================
+// Edge Cases and Combinations
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_empty_commit_sha_with_branch() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("main".to_string());
+    let commit_sha = "";
+
+    // Empty commit SHA but branch present
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_non_empty_commit_sha_with_no_branch() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = None;
+    let commit_sha = "abc123def456";
+
+    // Non-empty commit SHA but no branch
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_both_commit_sha_and_branch_present() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = Some("develop".to_string());
+    let commit_sha = "1234567890abcdef";
+
+    // Both commit SHA and branch present
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_neither_commit_sha_nor_branch() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.branch = None;
+    let commit_sha = "";
+
+    // Neither commit SHA nor branch present (non-git repo)
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+// ============================================================================
+// Special Characters Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_commit_sha_with_letters_only() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "abcdefabcdefabcd"; // Valid hex letters only
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_commit_sha_with_numbers_only() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "1234567890123456";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_commit_sha_with_mixed_case() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "AbCdEf0123456789";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_whitespace_in_commit_sha() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "abc 123 def 456";
+
+    // Whitespace in commit SHA (shouldn't happen in practice but test it)
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_special_chars_in_commit_sha() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "abc-123_def.456";
+
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+// ============================================================================
+// Idempotency Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_can_be_called_multiple_times() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "abc123";
+
+    // Function should be safe to call multiple times with same data
+    log_scan_run_info(&scan_run, commit_sha);
+    log_scan_run_info(&scan_run, commit_sha);
+    log_scan_run_info(&scan_run, commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_different_commit_shas() {
+    let scan_run = create_minimal_scan_run();
+
+    // Should handle different commit SHAs
+    log_scan_run_info(&scan_run, "");
+    log_scan_run_info(&scan_run, "abc123");
+    log_scan_run_info(&scan_run, "def456");
+    log_scan_run_info(&scan_run, "1234567890abcdef");
+}
+
+#[test]
+fn test_log_scan_run_info_rapid_succession() {
+    let scan_run = create_minimal_scan_run();
+    let commit_sha = "xyz789";
+
+    // Call function many times in rapid succession
+    for _ in 0..100 {
+        log_scan_run_info(&scan_run, commit_sha);
+    }
+}
+
+// ============================================================================
+// Version Field Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_version_field_none() {
+    let scan_run = create_minimal_scan_run();
+    assert_eq!(scan_run.version, None);
+
+    log_scan_run_info(&scan_run, "abc123");
+}
+
+#[test]
+fn test_log_scan_run_info_with_version_field_some() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.version = Some("v1.0.0".to_string());
+
+    log_scan_run_info(&scan_run, "def456");
+}
+
+// ============================================================================
+// Path Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_short_repo_path() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.repo_path = "/tmp/repo".to_string();
+
+    log_scan_run_info(&scan_run, "ghi789");
+}
+
+#[test]
+fn test_log_scan_run_info_with_long_repo_path() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.repo_path = "/very/long/path/to/repository/".to_string() + &"nested/".repeat(20);
+
+    log_scan_run_info(&scan_run, "jkl012");
+}
+
+#[test]
+fn test_log_scan_run_info_with_unicode_in_repo_path() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.repo_path = "/home/用户/项目/测试".to_string();
+
+    log_scan_run_info(&scan_run, "mno345");
+}
+
+#[test]
+fn test_log_scan_run_info_with_spaces_in_repo_path() {
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.repo_path = "/path/with spaces/in the name".to_string();
+
+    log_scan_run_info(&scan_run, "pqr678");
+}
+
+// ============================================================================
+// Timestamp Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_current_timestamp() {
+    let scan_run = create_minimal_scan_run();
+
+    // Timestamp should be recent
+    let now = Utc::now();
+    let duration = now.signed_duration_since(scan_run.scanned_at);
+    assert!(duration.num_seconds() >= 0 && duration.num_seconds() < 60);
+
+    log_scan_run_info(&scan_run, "stu901");
+}
+
+#[test]
+fn test_log_scan_run_info_with_different_timestamps() {
+    let scan_run1 = create_minimal_scan_run();
+    std::thread::sleep(std::time::Duration::from_millis(10));
+    let scan_run2 = create_minimal_scan_run();
+
+    // Different scan runs should have different timestamps
+    assert!(scan_run2.scanned_at >= scan_run1.scanned_at);
+
+    log_scan_run_info(&scan_run1, "vwx234");
+    log_scan_run_info(&scan_run2, "yza567");
+}
+
+// ============================================================================
+// Integration Tests with create_scan_run
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_output_from_create_scan_run() {
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    // Use create_scan_run to create a real scan run
+    let (scan_run, commit_sha) = create_scan_run(path, None);
+
+    // log_scan_run_info should work with real output from create_scan_run
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_with_create_scan_run_and_version() {
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    let (scan_run, commit_sha) = create_scan_run(path, Some("v2.0.0"));
+
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_workflow_multiple_scan_runs() {
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    // Simulate multiple scan runs in sequence
+    for i in 0..5 {
+        let version = format!("v1.{}.0", i);
+        let (scan_run, commit_sha) = create_scan_run(path, Some(&version));
+        log_scan_run_info(&scan_run, &commit_sha);
+    }
+}
+
+// ============================================================================
+// Consistency Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_commit_sha_matches_scan_run_field() {
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let path = temp_dir.path();
+
+    let (scan_run, commit_sha) = create_scan_run(path, None);
+
+    // Verify consistency between commit_sha parameter and scan_run.commit_sha
+    let expected_commit_sha = scan_run.commit_sha.clone().unwrap_or_default();
+    assert_eq!(commit_sha, expected_commit_sha);
+
+    log_scan_run_info(&scan_run, &commit_sha);
+}
+
+#[test]
+fn test_log_scan_run_info_handles_mismatch_between_params_and_scan_run() {
+    // Test what happens when commit_sha parameter doesn't match scan_run.commit_sha
+    // This shouldn't happen in production but test for robustness
+    let mut scan_run = create_minimal_scan_run();
+    scan_run.commit_sha = Some("abc123".to_string());
+
+    // Pass a different commit SHA
+    let different_commit_sha = "xyz789";
+
+    // Function should not panic even with mismatched data
+    log_scan_run_info(&scan_run, different_commit_sha);
+}
+
+// ============================================================================
+// Boundary Tests
+// ============================================================================
+
+#[test]
+fn test_log_scan_run_info_with_minimal_scan_run() {
+    // Test with bare minimum scan run data
+    let scan_run = ScanRun::new("");
+
+    log_scan_run_info(&scan_run, "");
+}
+
+#[test]
+fn test_log_scan_run_info_with_maximal_scan_run() {
+    // Test with all fields populated with substantial data
+    let scan_run =
+        ScanRun::new("/very/long/path/to/repository/".to_string() + &"nested/".repeat(10))
+            .with_commit(VALID_FULL_COMMIT_SHA)
+            .with_branch("feature/very-long-branch-name-with-lots-of-details")
+            .with_version("v1.2.3-beta.1+build.12345");
+
+    log_scan_run_info(&scan_run, VALID_FULL_COMMIT_SHA);
+}
+
+// ============================================================================
+// Helper Functions
+// ============================================================================
+
+/// Create a minimal scan run for testing purposes
+fn create_minimal_scan_run() -> ScanRun {
+    let temp_dir = TempDir::new().expect("Failed to create temp dir");
+    let (scan_run, _) = create_scan_run(temp_dir.path(), None);
+    scan_run
+}