init: archlens — architecture diagram generator

Hex arch + DDD, tree-sitter parsing, Mermaid/ASCII output.
Supports Rust + Python. 92 tests. CI, diff, --check for staleness detection.

crates/presentation/tests/end_to_end_tests.rs

@@ -0,0 +1,133 @@
+use std::fs;
+
+use archlens::run;
+
+fn create_rust_project(dir: &std::path::Path) {
+    fs::create_dir_all(dir.join("src")).unwrap();
+    fs::write(
+        dir.join("src/order.rs"),
+        "pub struct Order {\n    pub id: u64,\n}\n",
+    )
+    .unwrap();
+    fs::write(
+        dir.join("src/service.rs"),
+        "pub struct OrderService {\n    order: Order,\n}\n",
+    )
+    .unwrap();
+}
+
+fn create_multi_module_project(dir: &std::path::Path) {
+    fs::create_dir_all(dir.join("src/orders")).unwrap();
+    fs::create_dir_all(dir.join("src/billing")).unwrap();
+    fs::write(
+        dir.join("src/orders/order.rs"),
+        "pub struct Order {\n    pub id: u64,\n}\n",
+    )
+    .unwrap();
+    fs::write(
+        dir.join("src/orders/service.rs"),
+        "pub struct OrderService {\n    order: Order,\n}\n",
+    )
+    .unwrap();
+    fs::write(
+        dir.join("src/billing/invoice.rs"),
+        "pub struct Invoice {\n    pub total: f64,\n}\n",
+    )
+    .unwrap();
+}
+
+#[test]
+fn analyzes_rust_project_and_writes_mermaid_to_file() {
+    let project = tempfile::tempdir().unwrap();
+    create_rust_project(project.path());
+
+    let output_dir = tempfile::tempdir().unwrap();
+    let output_file = output_dir.path().join("arch.mmd");
+
+    run(archlens::CliArgs {
+        command: None,
+        path: project.path().to_path_buf(),
+        level: "type".to_string(),
+        format: "mermaid".to_string(),
+        output: Some(output_file.to_str().unwrap().to_string()),
+        config: None,
+        scope: None,
+        exclude: vec![],
+        split_by_module: false,
+        strict: false,
+        check: false,
+        verbose: 0,
+    })
+    .unwrap();
+
+    let content = fs::read_to_string(&output_file).unwrap();
+    assert!(content.contains("classDiagram"));
+    assert!(content.contains("Order"));
+    assert!(content.contains("OrderService"));
+}
+
+#[test]
+fn works_without_config_file() {
+    let project = tempfile::tempdir().unwrap();
+    create_rust_project(project.path());
+
+    let output_dir = tempfile::tempdir().unwrap();
+    let output_file = output_dir.path().join("arch.mmd");
+
+    let result = run(archlens::CliArgs {
+        command: None,
+        path: project.path().to_path_buf(),
+        level: "type".to_string(),
+        format: "mermaid".to_string(),
+        output: Some(output_file.to_str().unwrap().to_string()),
+        config: None,
+        scope: None,
+        exclude: vec![],
+        split_by_module: false,
+        strict: false,
+        check: false,
+        verbose: 0,
+    });
+
+    assert!(result.is_ok());
+}
+
+#[test]
+fn split_by_module_writes_overview_and_per_module_files() {
+    let project = tempfile::tempdir().unwrap();
+    create_multi_module_project(project.path());
+
+    let output_dir = tempfile::tempdir().unwrap();
+
+    run(archlens::CliArgs {
+        command: None,
+        path: project.path().to_path_buf(),
+        level: "module".to_string(),
+        format: "mermaid".to_string(),
+        output: Some(output_dir.path().to_str().unwrap().to_string()),
+        config: None,
+        scope: None,
+        exclude: vec![],
+        split_by_module: true,
+        strict: false,
+        check: false,
+        verbose: 0,
+    })
+    .unwrap();
+
+    let overview = output_dir.path().join("overview.mmd");
+    assert!(overview.exists(), "overview.mmd should exist");
+
+    let overview_content = fs::read_to_string(&overview).unwrap();
+    assert!(overview_content.contains("graph TD") || overview_content.contains("classDiagram"));
+
+    let entries: Vec<_> = fs::read_dir(output_dir.path())
+        .unwrap()
+        .filter_map(|e| e.ok())
+        .collect();
+
+    assert!(
+        entries.len() > 1,
+        "should have overview + at least one module file"
+    );
+}