feat: implement lit for cli tests

Author: bitwalker

Makefile.toml

@@ -249,7 +249,7 @@ args = ["clean"]
 [tasks.test]
 category = "Test"
 description = "Runs all tests"
-dependencies = ["test-rust", "test-cleanup"]
+dependencies = ["test-rust", "test-lit", "test-cleanup"]
 
 [tasks.test-rust]
 category = "Test"
@@ -262,13 +262,22 @@ dependencies = [
   "require-cmake",
 ]
 
+[tasks.test-lit]
+category = "Test"
+description = "Runs file-based checks using lit"
+env = { RUSTFLAGS = "-Z unstable-options -C link-args=-Wl,-rpath,${LLVM_PREFIX}/lib" }
+script_runner = "@rust"
+script = { file = "${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/scripts/lit.rs", absolute_path = true }
+dependencies = [
+  "lumen",
+]
+
 [tasks.test-cleanup]
 private = true
 #condition = { env = { CARGO_MAKE_CI = "true" } }
 script = ['''
 #!@duckscript
 
-rm -r ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/lumen/tests/_build
 rm -r ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/native_implemented/otp/tests/_build
 ''']
 

lumen/tests/cli.rs

@@ -0,0 +1,30 @@
+//! ```cargo
+//! [dependencies]
+//! lit = { git = "https://github.com/lumen/lit", branch = "erlang" }
+//! ```
+
+extern crate lit;
+
+use std::env;
+use std::path::PathBuf;
+
+const WORKSPACE_DIR: &'static str = env!("CARGO_MAKE_WORKING_DIRECTORY");
+
+fn main() {
+    let workspace_dir = PathBuf::from(WORKSPACE_DIR);
+    let lit_dir = workspace_dir.join("test/lit");
+    let lumen_exe = workspace_dir.join("bin/lumen");
+
+    lit::run::tests(lit::event_handler::Default::default(), |config| {
+        config.add_search_path(lit_dir.to_str().unwrap());
+        config.add_extension("erl");
+
+        config
+            .constants
+            .insert("tests".to_owned(), lit_dir.to_str().unwrap().to_string());
+        config
+            .constants
+            .insert("lumen".to_owned(), lumen_exe.to_str().unwrap().to_string());
+    })
+    .expect("lit tests failed, see output for details")
+}