[fea-rs] Fixups for ttx_test util

This utility had broken a bit during the move from the old fea-rs repo
into this new repo; in particular it would fail if you ran it from the
`fea-rs` directory, which is annoying.

We will now attempt to figure out where we're running from when
determining the path to the test data, instead of hardcoding paths.

fea-rs/src/bin/ttx_test.rs

@@ -6,14 +6,13 @@ use std::path::{Path, PathBuf};
 use clap::Parser;
 use fea_rs::util::ttx;
 
-static TEST_DATA: &str = "./fea-rs/test-data/fonttools-tests";
 static WIP_DIFF_DIR: &str = "./wip";
 
 fn main() {
     env_logger::init();
     let args = Args::parse();
 
-    let results = ttx::run_all_tests(TEST_DATA, args.test_filter.as_ref());
+    let results = ttx::run_fonttools_tests(args.test_filter.as_ref());
 
     if let Some(to_compare) = args
         .compare

fea-rs/src/tests/compile.rs

@@ -13,14 +13,13 @@ static GOOD_DIR: &str = "good";
 static BAD_DIR: &str = "bad";
 static GLYPH_ORDER: &str = "glyph_order.txt";
 static BAD_OUTPUT_EXTENSION: &str = "ERR";
-static FONTTOOLS_TESTS: &str = "./test-data/fonttools-tests";
 static IMPORT_RESOLUTION_TEST: &str = "./test-data/include-resolution-tests/dir1/test1.fea";
 
 // tests taken directly from fonttools; these require some special handling.
 #[test]
 fn fonttools_tests() -> Result<(), Report> {
     test_utils::assert_has_ttx_executable();
-    test_utils::run_all_tests(FONTTOOLS_TESTS, None).into_error()
+    test_utils::run_fonttools_tests(None).into_error()
 }
 
 #[test]

fea-rs/src/util/ttx.rs

@@ -146,7 +146,8 @@ impl<'a> Filter<'a> {
 ///
 /// `filter` is an optional comma-separated list of strings. If present, only
 /// tests which contain one of the strings in the list will be run.
-pub fn run_all_tests(fonttools_data_dir: impl AsRef<Path>, filter: Option<&String>) -> Report {
+pub fn run_fonttools_tests(filter: Option<&String>) -> Report {
+    let fonttools_data_dir = test_data_dir().join("fonttools-tests");
     let glyph_map = fonttools_test_glyph_order();
     let filter = Filter::new(filter);
     let var_info = make_var_info();
@@ -504,25 +505,38 @@ pub fn plain_text_diff(left: &str, right: &str) -> String {
     result
 }
 
-/// Generate the sample glyph map.
+/// return the path to the test-data directory.
 ///
-/// This is the glyph map used in the feaLib test suite.
-pub(crate) fn fonttools_test_glyph_order() -> GlyphMap {
+/// This figures out if we're running from the crate root or the project root.
+fn test_data_dir() -> PathBuf {
     let cwd = std::env::current_dir().expect("could not retrieve current directory");
     // hack: during testing cwd is the crate root, but when running a binary
     // it may be the project root
     let path = if cwd.ends_with("fea-rs") {
         assert!(!cwd.parent().expect("always presnt").ends_with("fea-rs"));
-        "./test-data/simple_glyph_order.txt"
+        "./test-data"
     } else {
-        "./fea-rs/test-data/simple_glyph_order.txt"
+        "./fea-rs/test-data"
     };
-    if !Path::new(path).exists() {
+    let path = Path::new(path);
+    if !path.exists() {
         panic!(
-            "could not locate glyph order file (cwd '{}', path '{path}' )",
+            "could not locate fea-rs test-data. Please run from crate or project root. (cwd '{}')",
             cwd.display()
         );
     }
+    path.to_owned()
+}
+
+/// Generate the sample glyph map.
+///
+/// This is the glyph map used in the feaLib test suite.
+pub(crate) fn fonttools_test_glyph_order() -> GlyphMap {
+    let mut path = test_data_dir();
+    path.push("simple_glyph_order.txt");
+    if !path.exists() {
+        panic!("could not locate glyph map at {}", path.display());
+    }
     let order_str = std::fs::read_to_string(path).unwrap();
     crate::compile::parse_glyph_order(&order_str)
         .unwrap()