From c5a02ca166b5190ba4eaf533ddef022f3d7c0547 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Tue, 28 Oct 2025 13:45:22 +0000
Subject: [PATCH] v1.7.0

---
 CHANGELOG.md                          |  4 ++++
 gleam.toml                            |  2 +-
 src/gleeunit/internal/reporting.gleam | 11 +++++++++++
 src/gleeunit_ffi.erl                  | 15 +++++++++++----
 src/gleeunit_progress.erl             |  2 --
 5 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3149c3..4df43cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v1.7.0 - 2025-10-28
+
+- A custom error is now emitted if Eunit is missing from the Erlang runtime.
+
 ## v1.6.2 - 2025-08-23
 
 - Fixed a bug where the number of passes was reported as the total number of
diff --git a/gleam.toml b/gleam.toml
index eb1c12c..887e87e 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -1,5 +1,5 @@
 name = "gleeunit"
-version = "1.6.2"
+version = "1.7.0"
 licences = ["Apache-2.0"]
 description = "A simple test runner for Gleam, using EUnit on Erlang"
 repository = { type = "github", user = "lpil", repo = "gleeunit" }
diff --git a/src/gleeunit/internal/reporting.gleam b/src/gleeunit/internal/reporting.gleam
index 3fe25ed..72f766f 100644
--- a/src/gleeunit/internal/reporting.gleam
+++ b/src/gleeunit/internal/reporting.gleam
@@ -86,6 +86,17 @@ pub fn test_failed(
   State(..state, failed: state.failed + 1)
 }
 
+pub fn eunit_missing() -> Result(never, Nil) {
+  let message = bold(red("Error")) <> ": EUnit libraries not found.
+
+Your Erlang installation seems to be incomplete. If you installed Erlang using
+a package manager ensure that you have installed the full Erlang
+distribution instead of a stripped-down version.
+"
+  io.print_error(message)
+  Error(Nil)
+}
+
 fn format_unknown(
   module: String,
   function: String,
diff --git a/src/gleeunit_ffi.erl b/src/gleeunit_ffi.erl
index 29b9553..099098a 100644
--- a/src/gleeunit_ffi.erl
+++ b/src/gleeunit_ffi.erl
@@ -7,8 +7,15 @@ find_files(Pattern, In) ->
   lists:map(fun list_to_binary/1, Results).
 
 run_eunit(Tests, Options) ->
-    case eunit:test({timeout, 60, Tests}, Options) of
-        ok -> {ok, nil};
-        error -> {error, nil};
-        {error, Term} -> {error, Term}
+    case code:which(eunit) of
+        non_existing ->
+            gleeunit@internal@reporting:eunit_missing();
+
+        _ -> 
+            case eunit:test({timeout, 60, Tests}, Options) of
+                ok -> {ok, nil};
+                error -> {error, nil};
+                {error, Term} -> {error, Term}
+            end
     end.
+    
diff --git a/src/gleeunit_progress.erl b/src/gleeunit_progress.erl
index 2883008..e6576a5 100644
--- a/src/gleeunit_progress.erl
+++ b/src/gleeunit_progress.erl
@@ -1,9 +1,7 @@
 %% A formatter adapted from Sean Cribb's https://github.com/seancribbs/eunit_formatters
 
 -module(gleeunit_progress).
--behaviour(eunit_listener).
 -define(NOTEST, true).
--include_lib("eunit/include/eunit.hrl").
 
 %% eunit_listener callbacks
 -export([