test(cli): isolate the suite from the real ~/.config/lectio

The ref/rand cli tests assume English book abbreviations ("Jn 3:16"), but
with no LECTIO_CONFIG set they read the developer's real user config. On a
machine whose config has ui_language = pl (sigla_style = auto -> Polish
dialect), "Jn" is not a valid abbreviation and TestRefSingle,
TestRefEnglishDialect, TestRefRejectsPolishAbbrevInEnglish, TestRefCompare
and TestRandVerse fail -- while passing on a clean CI.

Add a package TestMain that points LECTIO_CONFIG at a throwaway temp path,
forcing built-in defaults for every cli test and guaranteeing the suite
never reads or writes the real user config. Suite now green on a Polish
config too.

1 files changed, 26 insertions, 0 deletions

diff --git a/internal/cli/main_test.go b/internal/cli/main_test.go
new file mode 100644
index 0000000..62989e5
--- /dev/null
+++ b/internal/cli/main_test.go
@@ -0,0 +1,26 @@
+package cli
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// TestMain isolates the cli test suite from the developer's real
+// ~/.config/lectio. Several reference/random tests assume English book
+// abbreviations (e.g. "Jn 3:16"); a user config with ui_language = pl makes
+// sigla_style = auto resolve to the Polish dialect, where "Jn" is not a valid
+// abbreviation, so those tests fail on such a developer's machine even though
+// they pass on a clean CI. Pointing LECTIO_CONFIG at a throwaway,
+// non-existent path forces the built-in defaults for every cli test and keeps
+// the suite from ever reading -- or writing -- the real user config.
+func TestMain(m *testing.M) {
+	dir, err := os.MkdirTemp("", "lectio-cli-test")
+	if err != nil {
+		panic(err)
+	}
+	os.Setenv("LECTIO_CONFIG", filepath.Join(dir, "config.ini"))
+	code := m.Run()
+	os.RemoveAll(dir)
+	os.Exit(code)
+}