tldr-cli 0.4.0

//! Per-language test framework recognizers.
//!
//! Closes phase-11 BUG-AGG-3 (HIGH): `tldr specs --from-tests` and
//! `tldr invariants --from-tests` previously hard-coded Python `test_*`
//! pytest-style discovery, so JavaScript/Java/PHP/Swift/Go/Kotlin/Scala/
//! Ruby/Elixir/Lua test directories returned `test_files_scanned = 0`
//! despite containing real test functions.
//!
//! Each recognizer answers two questions per file:
//!
//! 1. **Is this a test file?** (per the language's discovery convention)
//! 2. **How many test functions does it contain?** (counted via tree-sitter
//!    AST walks rather than text-level heuristics, so comments and string
//!    literals can't false-match.)
//!
//! Languages handled:
//!
//! | Language    | Convention                                                 |
//! |-------------|------------------------------------------------------------|
//! | Python      | `def test_*` (pytest) or methods inside `class Test*`      |
//! | JavaScript  | `it(...)` / `test(...)` calls (Mocha/Jest/Jasmine)         |
//! | TypeScript  | `it(...)` / `test(...)` calls                              |
//! | Java        | Methods annotated with `@Test`                             |
//! | Kotlin      | Methods annotated with `@Test`                             |
//! | PHP         | `public function test*` inside class whose name ends `Test`|
//! | Swift       | `func test*()` inside class extending `XCTestCase`         |
//! | Ruby        | `def test_*` (Minitest) or `it/describe` blocks (RSpec)    |
//! | Go          | Top-level `func TestXxx(t *testing.T)`                     |
//! | Scala       | `test("...")` calls (Munit/ScalaTest FunSuite)             |
//! | Elixir      | `test "..." do ... end` blocks (ExUnit)                    |
//! | Lua / Luau  | `it(...)` / `describe(...)` blocks (busted)                |
//! | Rust        | `fn` items immediately preceded by `#[test]`               |
//! | C#          | Methods with `[Test]` / `[Fact]` / `[TestMethod]`          |
//! | C / C++ /   | (No widely standard test framework — fall back to file     |
//! | OCaml       |  count when name suggests test, function count = 0; the   |
//! |             |  framework adapter can be wired later.)                    |
//!
//! For languages without a clear convention, the recognizer treats files
//! whose name contains `test` (case-insensitive) as test files but reports
//! `0` functions — strictly better than the previous behaviour where the
//! file count itself was always `0` for non-Python.

use std::path::Path;

use tldr_core::ast::ParserPool;
use tldr_core::Language;
use tree_sitter::{Node, Tree};

/// Result of inspecting a single candidate file for test functions.
#[derive(Debug, Clone, Default)]
pub struct TestFileInfo {
    /// True if this file participates in a test suite (i.e. should bump
    /// `test_files_scanned`).
    pub is_test_file: bool,
    /// Number of test functions detected by walking the AST.
    pub test_function_count: u32,
}

/// Public entry point: classify a candidate file and count its tests.
///
/// `language` is the language the caller has already detected for the
/// file (typically via `Language::from_path` in `run_specs` /
/// `collect_observations`). Returns a default zero-info value if the
/// file is not parseable in this language.
pub fn recognize(path: &Path, source: &str, language: Language) -> TestFileInfo {
    if !is_candidate_test_file(path, language) {
        return TestFileInfo::default();
    }

    // language-specific-bugs-v1 (P14.AGG14-9): for Rust, every `.rs` is
    // a path-level candidate so `tldr specs --from-tests` can cover
    // inline `#[cfg(test)] mod tests { ... }` blocks inside production
    // source files (e.g. ripgrep `crates/globset/src/lib.rs`). To keep
    // directory walks cheap, gate on a fast `#[test]` substring check
    // before parsing — any `.rs` without `#[test]` cannot contribute
    // and parsing the entire file would just be wasted work.
    if matches!(language, Language::Rust) && !source.contains("#[test]") {
        return TestFileInfo::default();
    }

    // Empty or whitespace-only files: nothing to count.
    if source.trim().is_empty() {
        return TestFileInfo {
            is_test_file: true,
            test_function_count: 0,
        };
    }

    let pool = ParserPool::new();
    let tree = match pool.parse(source, language).ok() {
        Some(t) => t,
        None => {
            return TestFileInfo {
                is_test_file: true,
                test_function_count: 0,
            };
        }
    };

    let count = count_test_functions(&tree, source.as_bytes(), language);

    TestFileInfo {
        is_test_file: true,
        test_function_count: count,
    }
}

/// Decide whether `path` matches the language's test-file naming convention.
///
/// Each language has its own convention; we centralise them here so
/// `run_specs` can early-skip non-tests cheaply (without parsing).
fn is_candidate_test_file(path: &Path, language: Language) -> bool {
    let file_name = match path.file_name().and_then(|n| n.to_str()) {
        Some(n) => n,
        None => return false,
    };
    let stem = path
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or(file_name);
    let lower = file_name.to_ascii_lowercase();

    match language {
        // Python: `test_*.py` (pytest) or `*_test.py` (unittest-style).
        Language::Python => {
            file_name.starts_with("test_") && file_name.ends_with(".py")
                || file_name.ends_with("_test.py")
        }
        // JavaScript / TypeScript: Jest/Mocha conventions.
        // `*.test.js` / `*.spec.js` (and tsx/jsx variants), or any file
        // inside a directory literally named `__tests__`.
        Language::JavaScript | Language::TypeScript => {
            let in_tests_dir = path
                .components()
                .any(|c| c.as_os_str() == "__tests__" || c.as_os_str() == "test"
                    || c.as_os_str() == "tests" || c.as_os_str() == "spec");
            let has_test_marker = stem.ends_with(".test")
                || stem.ends_with(".spec")
                || stem.ends_with("_test")
                || stem.ends_with("_spec")
                || stem.ends_with("Test")
                || stem.ends_with("Spec");
            (has_test_marker || in_tests_dir)
                && (lower.ends_with(".js")
                    || lower.ends_with(".jsx")
                    || lower.ends_with(".mjs")
                    || lower.ends_with(".cjs")
                    || lower.ends_with(".ts")
                    || lower.ends_with(".tsx"))
        }
        // Java: Maven/Gradle convention — files under `src/test/java` are
        // tests, or any class whose name ends with `Test`/`Tests`.
        Language::Java => {
            if !lower.ends_with(".java") {
                return false;
            }
            stem.ends_with("Test")
                || stem.ends_with("Tests")
                || stem.ends_with("IT")
                || stem.ends_with("ITCase")
                || path.components().any(|c| c.as_os_str() == "test")
        }
        // Kotlin: same convention as Java.
        Language::Kotlin => {
            (lower.ends_with(".kt") || lower.ends_with(".kts"))
                && (stem.ends_with("Test")
                    || stem.ends_with("Tests")
                    || path.components().any(|c| c.as_os_str() == "test"))
        }
        // PHP: PHPUnit convention — class FooTest in FooTest.php.
        Language::Php => lower.ends_with(".php") && (stem.ends_with("Test") || stem.ends_with("Tests")),
        // Swift: XCTest convention — files named `*Tests.swift`.
        Language::Swift => {
            lower.ends_with(".swift")
                && (stem.ends_with("Tests") || stem.ends_with("Test") || stem.ends_with("Spec"))
        }
        // Ruby: Minitest `test_*.rb` / `*_test.rb`; RSpec `*_spec.rb`.
        Language::Ruby => {
            lower.ends_with(".rb")
                && (file_name.starts_with("test_")
                    || stem.ends_with("_test")
                    || stem.ends_with("_spec"))
        }
        // Go: convention is `*_test.go`.
        Language::Go => lower.ends_with("_test.go"),
        // Scala: Munit / ScalaTest convention — `*Suite.scala`/`*Spec.scala`/`*Test.scala`.
        Language::Scala => {
            lower.ends_with(".scala")
                && (stem.ends_with("Test")
                    || stem.ends_with("Tests")
                    || stem.ends_with("Spec")
                    || stem.ends_with("Suite"))
        }
        // Elixir: ExUnit convention — `*_test.exs`.
        Language::Elixir => {
            (lower.ends_with(".exs") || lower.ends_with(".ex"))
                && (stem.ends_with("_test") || file_name.starts_with("test_"))
        }
        // Lua / Luau: busted convention — `*_spec.lua`/`*_test.lua`.
        Language::Lua | Language::Luau => {
            (lower.ends_with(".lua") || lower.ends_with(".luau"))
                && (stem.ends_with("_spec")
                    || stem.ends_with("_test")
                    || file_name.starts_with("test_"))
        }
        // Rust: built-in `#[test]` framework — files under `tests/` are
        // integration tests, and any source file may contain `#[cfg(test)]`
        // mod blocks. Treat any `.rs` whose path contains `test` (a tests/
        // directory or a *_test.rs filename), `bench`, OR contains a
        // `#[test]` substring as a candidate;
        // matches_test_function then filters down to actual `#[test]` items.
        //
        // language-specific-bugs-v1 (P14.AGG14-9): the path-only filter
        // missed the canonical Rust convention of inline
        // `#[cfg(test)] mod tests { ... }` blocks inside a regular
        // `lib.rs` / module file (every cargo crate has these). The
        // additional substring check at recognise-time
        // (`source.contains("#[test]")`) is cheap relative to parsing and
        // turns single-file invocations like `tldr specs --from-tests
        // crates/globset/src/lib.rs` into yielding the inline tests they
        // contain. Directory walks accept any `.rs` here and still rely on
        // `matches_test_function` for per-fn filtering.
        Language::Rust => {
            lower.ends_with(".rs")
        }
        // C#: NUnit / xUnit / MSTest — files named `*Tests.cs` or under
        // a Tests directory. matches_test_function filters down to methods
        // carrying `[Test]` / `[Fact]` / `[TestMethod]` etc.
        Language::CSharp => {
            lower.ends_with(".cs")
                && (stem.ends_with("Test")
                    || stem.ends_with("Tests")
                    || path.components().any(|c| {
                        let s = c.as_os_str().to_string_lossy().to_ascii_lowercase();
                        s == "test" || s == "tests"
                    }))
        }
        // Languages without a single dominant convention. Fall back to the
        // weak heuristic of "filename contains 'test'" so directories laid
        // out as `tests/` still count their files. The function-count
        // walker still returns 0 for these — wiring grammar-specific
        // recognisers is left as TODO.
        Language::C | Language::Cpp | Language::Ocaml => {
            lower.contains("test") || lower.contains("spec")
        }
    }
}

/// AST-walk a parsed test file and count test functions per language convention.
fn count_test_functions(tree: &Tree, source: &[u8], language: Language) -> u32 {
    let root = tree.root_node();
    let mut count = 0u32;
    walk_count(&root, source, language, &mut count);
    count
}

fn walk_count(node: &Node, source: &[u8], language: Language, count: &mut u32) {
    if matches_test_function(node, source, language) {
        *count += 1;
        // Don't recurse into a function body — nested calls inside a
        // matched test function shouldn't be double-counted (e.g. an
        // `it(...)` inside a `describe(...)` block both match the JS
        // recogniser; only the leaf `it` counts).
        return;
    }

    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        walk_count(&child, source, language, count);
    }
}

/// Public wrapper around the per-language test-function predicate.
///
/// `tldr specs --from-tests` re-uses this from the generic spec extractor
/// so the same definition of "test function" used to count tests is used
/// to harvest assertions inside them.
pub fn is_test_function_node(node: &Node, source: &[u8], language: Language) -> bool {
    matches_test_function(node, source, language)
}

/// Per-language predicate: is this AST node a test function declaration?
fn matches_test_function(node: &Node, source: &[u8], language: Language) -> bool {
    match language {
        Language::Python => python_is_test_function(node, source),
        Language::JavaScript | Language::TypeScript => js_is_test_call(node, source),
        Language::Java | Language::Kotlin => jvm_has_test_annotation(node, source),
        Language::Php => php_is_test_method(node, source),
        Language::Swift => swift_is_test_method(node, source),
        Language::Ruby => ruby_is_test_def_or_block(node, source),
        Language::Go => go_is_top_level_test_function(node, source),
        Language::Scala => scala_is_test_call(node, source),
        Language::Elixir => elixir_is_test_macro(node, source),
        Language::Lua | Language::Luau => lua_is_test_call(node, source),
        Language::Rust => rust_is_test_function(node, source),
        Language::CSharp => csharp_has_test_attribute(node, source),
        Language::C | Language::Cpp | Language::Ocaml => false,
    }
}

// -- Rust: `#[test]` attribute precedes a `fn` item ---------------------------
//
// In tree-sitter-rust, `#[test]` is parsed as an `attribute_item` that is a
// SIBLING (preceding) of the `function_item`, not a child. So at every
// `function_item` we walk back to the previous siblings collecting any
// `attribute_item` nodes; if any contains an `attribute` whose head
// identifier is `test`, this is a unit test. We also accept aliases
// commonly used in async/integration setups: `tokio::test`, `async_std::test`,
// `rstest`, `proptest`, plus the common `test_case` macro.
fn rust_is_test_function(node: &Node, source: &[u8]) -> bool {
    if node.kind() != "function_item" {
        return false;
    }
    let mut prev = node.prev_sibling();
    while let Some(p) = prev {
        match p.kind() {
            "attribute_item" => {
                if rust_attribute_is_test(&p, source) {
                    return true;
                }
                prev = p.prev_sibling();
            }
            "line_comment" | "block_comment" => {
                prev = p.prev_sibling();
            }
            _ => break,
        }
    }
    false
}

fn rust_attribute_is_test(attr_item: &Node, source: &[u8]) -> bool {
    // attribute_item -> [#, [, attribute(...), ]]
    let mut cursor = attr_item.walk();
    for child in attr_item.children(&mut cursor) {
        if child.kind() == "attribute" {
            // attribute can be `test`, `tokio::test`, `test_case::test_case`,
            // etc. Walk and collect the tail identifier(s).
            let text = node_text(child, source);
            // Strip any argument list `(...)` and whitespace; take the path tail.
            let head = text
                .split(|c: char| c == '(' || c.is_whitespace())
                .next()
                .unwrap_or("");
            let tail = head.rsplit("::").next().unwrap_or("");
            if matches!(
                tail,
                "test" | "tokio_test" | "async_test" | "rstest" | "test_case"
            ) {
                return true;
            }
        }
    }
    false
}

// -- C#: methods with `[Test]` / `[Fact]` / `[TestMethod]` etc. --------------
//
// tree-sitter-c-sharp uses `method_declaration` whose direct children include
// one or more `attribute_list` nodes. Each `attribute_list` contains
// `attribute` children whose first identifier names the attribute (e.g.
// "Test", "Fact", "TestMethod", "TestCase", "Theory").
fn csharp_has_test_attribute(node: &Node, source: &[u8]) -> bool {
    if node.kind() != "method_declaration" {
        return false;
    }
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        if child.kind() == "attribute_list" {
            let mut inner = child.walk();
            for attr in child.children(&mut inner) {
                if attr.kind() == "attribute" && csharp_attribute_is_test(&attr, source) {
                    return true;
                }
            }
        }
    }
    false
}

fn csharp_attribute_is_test(attribute: &Node, source: &[u8]) -> bool {
    // Read the tail identifier of the attribute name.
    let text = node_text(*attribute, source);
    let head = text
        .split(|c: char| c == '(' || c.is_whitespace())
        .next()
        .unwrap_or("");
    let tail = head.rsplit('.').next().unwrap_or("");
    matches!(
        tail,
        "Test"
            | "TestAttribute"
            | "Fact"
            | "FactAttribute"
            | "Theory"
            | "TheoryAttribute"
            | "TestMethod"
            | "TestMethodAttribute"
            | "TestCase"
            | "TestCaseAttribute"
            | "DataTestMethod"
            | "DataTestMethodAttribute"
    )
}

// -- Python: `def test_*` -----------------------------------------------------
fn python_is_test_function(node: &Node, source: &[u8]) -> bool {
    if node.kind() != "function_definition" {
        return false;
    }
    let name = node
        .child_by_field_name("name")
        .map(|n| node_text(n, source))
        .unwrap_or_default();
    name.starts_with("test_")
}

// -- JS/TS: `it(...)` / `test(...)` -------------------------------------------
fn js_is_test_call(node: &Node, source: &[u8]) -> bool {
    // tree-sitter-typescript / -javascript both expose `call_expression`
    // with a `function` child that's an identifier for top-level calls.
    if node.kind() != "call_expression" {
        return false;
    }
    let func_node = match node.child_by_field_name("function") {
        Some(n) => n,
        None => return false,
    };
    // We only want unqualified identifiers (`it("...")`, `test("...")`),
    // not member calls like `obj.it(...)` which are unrelated.
    if func_node.kind() != "identifier" {
        return false;
    }
    let name = node_text(func_node, source);
    matches!(name.as_str(), "it" | "test" | "fit" | "xit" | "xtest")
}

// -- Java/Kotlin: methods with @Test annotation -------------------------------
fn jvm_has_test_annotation(node: &Node, source: &[u8]) -> bool {
    // Java tree-sitter: `method_declaration` with a sibling `modifiers`
    // child containing `marker_annotation` / `annotation` whose name is
    // `Test`. Kotlin (kotlin-ng): `function_declaration` with a `modifiers`
    // child containing `annotation` -> `user_type` -> `type_identifier`
    // text "Test".
    let kind = node.kind();
    if kind != "method_declaration" && kind != "function_declaration" {
        return false;
    }

    // Walk this node's modifier subtree looking for an annotation whose
    // last identifier component is "Test". Spans both Java and Kotlin AST
    // shapes, since both use roughly the same node names.
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        if child.kind() == "modifiers" {
            if subtree_contains_annotation_named(&child, source, "Test") {
                return true;
            }
        } else if child.kind() == "annotation" || child.kind() == "marker_annotation" {
            if annotation_has_name(&child, source, "Test") {
                return true;
            }
        }
    }
    false
}

fn subtree_contains_annotation_named(node: &Node, source: &[u8], target: &str) -> bool {
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        let kind = child.kind();
        if (kind == "annotation" || kind == "marker_annotation")
            && annotation_has_name(&child, source, target)
        {
            return true;
        }
        if subtree_contains_annotation_named(&child, source, target) {
            return true;
        }
    }
    false
}

/// True if `annotation_node` has its tail identifier equal to `target`
/// (e.g. `@Test`, `@org.junit.Test`, `@org.junit.jupiter.api.Test`).
fn annotation_has_name(annotation_node: &Node, source: &[u8], target: &str) -> bool {
    let text = node_text(*annotation_node, source);
    // Strip leading `@` and any argument list, then compare the tail
    // identifier (after the last `.`).
    let trimmed = text.trim_start_matches('@');
    let head = trimmed.split(|c: char| c == '(' || c.is_whitespace()).next().unwrap_or("");
    let last = head.rsplit('.').next().unwrap_or("");
    last == target
}

// -- PHP: PHPUnit `public function test*` -------------------------------------
fn php_is_test_method(node: &Node, source: &[u8]) -> bool {
    if node.kind() != "method_declaration" {
        return false;
    }
    let name = node
        .child_by_field_name("name")
        .map(|n| node_text(n, source))
        .unwrap_or_default();
    name.starts_with("test")
}

// -- Swift: `func test*()` ----------------------------------------------------
fn swift_is_test_method(node: &Node, source: &[u8]) -> bool {
    // tree-sitter-swift uses `function_declaration` (top-level) and
    // `protocol_function_declaration` (inside class body); we accept any
    // declaration whose `name` child starts with "test".
    let kind = node.kind();
    if !(kind == "function_declaration" || kind == "protocol_function_declaration") {
        return false;
    }
    // Swift grammar exposes the method name as the first `simple_identifier`
    // child after the `func` keyword. Walk children to find it.
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        if child.kind() == "simple_identifier" {
            return node_text(child, source).starts_with("test");
        }
    }
    false
}

// -- Ruby: `def test_*` (Minitest) or `it/describe` blocks (RSpec) -----------
fn ruby_is_test_def_or_block(node: &Node, source: &[u8]) -> bool {
    match node.kind() {
        "method" => {
            // Minitest: `def test_<name>`.
            let name = node
                .child_by_field_name("name")
                .map(|n| node_text(n, source))
                .unwrap_or_default();
            name.starts_with("test_")
        }
        "call" => {
            // RSpec: `it "..." do ... end` / `specify "..." do ... end`.
            let method = node
                .child_by_field_name("method")
                .map(|n| node_text(n, source))
                .unwrap_or_default();
            matches!(method.as_str(), "it" | "specify")
        }
        _ => false,
    }
}

// -- Go: top-level `func TestXxx(t *testing.T)` -------------------------------
fn go_is_top_level_test_function(node: &Node, source: &[u8]) -> bool {
    if node.kind() != "function_declaration" {
        return false;
    }
    let name = node
        .child_by_field_name("name")
        .map(|n| node_text(n, source))
        .unwrap_or_default();
    if !name.starts_with("Test") {
        return false;
    }
    // Filter out `Test` exactly (no following uppercase). The Go testing
    // convention is `TestXxx` where `X` is upper.
    let after = name.strip_prefix("Test").unwrap_or("");
    let starts_upper = after.chars().next().map(|c| c.is_ascii_uppercase()).unwrap_or(false);
    starts_upper
}

// -- Scala: `test("...") { ... }` calls ---------------------------------------
fn scala_is_test_call(node: &Node, source: &[u8]) -> bool {
    // tree-sitter-scala uses `call_expression`; the function child is a
    // `simple_identifier`/`identifier` named "test". We also accept the
    // FunSuite naming convention where a class extends `FunSuite` and
    // calls `test(...)` at class scope. Pattern-matching just the call
    // shape is sufficient for the common case.
    if node.kind() != "call_expression" {
        return false;
    }
    let func_node = match node.child_by_field_name("function") {
        Some(n) => n,
        None => return false,
    };
    let name = node_text(func_node, source);
    matches!(name.as_str(), "test")
}

// -- Elixir: `test "..." do ... end` ------------------------------------------
fn elixir_is_test_macro(node: &Node, source: &[u8]) -> bool {
    // tree-sitter-elixir parses macros as `call` nodes; the head is the
    // `target` child (an `identifier`), and the body is a `do_block`.
    if node.kind() != "call" {
        return false;
    }
    let target = match node.child_by_field_name("target") {
        Some(n) => n,
        None => return false,
    };
    node_text(target, source) == "test"
}

// -- Lua/Luau: `it(...)` / `describe(...)` (busted) ---------------------------
fn lua_is_test_call(node: &Node, source: &[u8]) -> bool {
    // tree-sitter-lua / -luau represent calls as `function_call`. The
    // function name lives in the `name` field (an `identifier`).
    if node.kind() != "function_call" && node.kind() != "function_call_statement" {
        return false;
    }
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        if child.kind() == "identifier" {
            return matches!(node_text(child, source).as_str(), "it" | "test");
        }
    }
    false
}

// -- Helpers ------------------------------------------------------------------
fn node_text(node: Node, source: &[u8]) -> String {
    let start = node.start_byte();
    let end = node.end_byte();
    if end <= source.len() {
        std::str::from_utf8(&source[start..end])
            .unwrap_or("")
            .to_string()
    } else {
        String::new()
    }
}

/// Detect language for a candidate test file. Returns `None` if the
/// extension isn't supported.
pub fn detect_language(path: &Path) -> Option<Language> {
    Language::from_path(path)
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs;
    use tempfile::tempdir;

    fn write(dir: &Path, name: &str, body: &str) -> std::path::PathBuf {
        let p = dir.join(name);
        if let Some(parent) = p.parent() {
            fs::create_dir_all(parent).ok();
        }
        fs::write(&p, body).unwrap();
        p
    }

    #[test]
    fn python_test_function_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "test_x.py",
            "def test_one():\n    pass\n\ndef test_two():\n    pass\n",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::Python);
        assert!(info.is_test_file);
        assert_eq!(info.test_function_count, 2);
    }

    #[test]
    fn javascript_describe_it_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "foo.test.js",
            "describe('s', () => { it('a', () => {}); it('b', () => {}); });",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::JavaScript);
        assert!(info.is_test_file);
        assert_eq!(info.test_function_count, 2);
    }

    #[test]
    fn java_test_annotation_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "FooTest.java",
            "import org.junit.Test;\nclass FooTest {\n  @Test public void shouldFoo() {}\n  @Test public void shouldBar() {}\n}\n",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::Java);
        assert!(info.is_test_file);
        assert_eq!(info.test_function_count, 2);
    }

    #[test]
    fn php_phpunit_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "FooTest.php",
            "<?php\nclass FooTest {\n  public function testBar() {}\n  public function testBaz() {}\n}\n",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::Php);
        assert!(info.is_test_file);
        assert_eq!(info.test_function_count, 2);
    }

    #[test]
    fn swift_xctest_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "FooTests.swift",
            "import XCTest\nclass FooTests: XCTestCase {\n  func testBar() {}\n  func testBaz() {}\n}\n",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::Swift);
        assert!(info.is_test_file);
        assert!(info.test_function_count >= 2);
    }

    #[test]
    fn go_testing_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "foo_test.go",
            "package foo\nimport \"testing\"\nfunc TestFoo(t *testing.T) {}\nfunc TestBar(t *testing.T) {}\nfunc helper() {}\n",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::Go);
        assert!(info.is_test_file);
        assert_eq!(info.test_function_count, 2);
    }

    #[test]
    fn ruby_minitest_counted() {
        let tmp = tempdir().unwrap();
        let p = write(
            tmp.path(),
            "foo_test.rb",
            "class FooTest\n  def test_one; end\n  def test_two; end\nend\n",
        );
        let src = fs::read_to_string(&p).unwrap();
        let info = recognize(&p, &src, Language::Ruby);
        assert!(info.is_test_file);
        assert_eq!(info.test_function_count, 2);
    }
}