From f9ebeb32efcb2a22e3ca7b79c199dc6486ffab4d Mon Sep 17 00:00:00 2001
From: Alisdair McDiarmid <alisdair@users.noreply.github.com>
Date: Thu, 23 Jun 2022 14:42:07 +0000
Subject: [PATCH] backport of commit ad5207602532fbed38d38582dde8429bee5c030f

---
 internal/addrs/module_test.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/internal/addrs/module_test.go b/internal/addrs/module_test.go
index 86065df4c7e7..67cfc6ba2d63 100644
--- a/internal/addrs/module_test.go
+++ b/internal/addrs/module_test.go
@@ -56,6 +56,31 @@ func TestModuleEqual_false(t *testing.T) {
 	}
 }
 
+func TestModuleString(t *testing.T) {
+	testCases := map[string]Module{
+		"": {},
+		"module.alpha": {
+			"alpha",
+		},
+		"module.alpha.module.beta": {
+			"alpha",
+			"beta",
+		},
+		"module.alpha.module.beta.module.charlie": {
+			"alpha",
+			"beta",
+			"charlie",
+		},
+	}
+	for str, module := range testCases {
+		t.Run(str, func(t *testing.T) {
+			if got, want := module.String(), str; got != want {
+				t.Errorf("wrong result: got %q, want %q", got, want)
+			}
+		})
+	}
+}
+
 func BenchmarkModuleStringShort(b *testing.B) {
 	module := Module{"a", "b"}
 	for n := 0; n < b.N; n++ {