add failing test for IgnoreAllChanges override

internal/configs/module_merge_test.go

@@ -320,3 +320,13 @@ func TestModuleOverrideResourceFQNs(t *testing.T) {
 		t.Fatalf("wrong result: found provider config ref %s, expected nil", got.ProviderConfigRef)
 	}
 }
+
+func TestModuleOverrideIgnoreAllChanges(t *testing.T) {
+	mod, diags := testModuleFromDir("testdata/valid-modules/override-ignore-changes")
+	assertNoDiagnostics(t, diags)
+
+	r := mod.ManagedResources["test_instance.foo"]
+	if !r.Managed.IgnoreAllChanges {
+		t.Fatalf("wrong result: expected r.Managed.IgnoreAllChanges to be true")
+	}
+}

internal/configs/testdata/valid-modules/override-ignore-changes/main.tf

@@ -0,0 +1,3 @@
+resource "test_instance" "foo" {
+  foo = "bar"
+}

internal/configs/testdata/valid-modules/override-ignore-changes/main_override.tf

@@ -0,0 +1,6 @@
+resource "test_instance" "foo" {
+  foo = "bar"
+  lifecycle {
+    ignore_changes = all
+  }
+}