test: use generics in Equal function signature

This simplifies comparing a typed value against nil. Previously it was
necessary to case nil into the proper type.

internal/backend/location/location_test.go

@@ -29,7 +29,7 @@ func TestParse(t *testing.T) {
 	u, err := location.Parse(registry, path)
 	test.OK(t, err)
 	test.Equals(t, "local", u.Scheme)
-	test.Equals(t, &testConfig{loc: path}, u.Config)
+	test.Equals(t, any(&testConfig{loc: path}), u.Config)
 }
 
 func TestParseFallback(t *testing.T) {

internal/backend/util/defaults_test.go

@@ -37,7 +37,7 @@ func TestDefaultLoad(t *testing.T) {
 
 		return rd, nil
 	}, func(ird io.Reader) error {
-		rtest.Equals(t, rd, ird)
+		rtest.Equals(t, io.Reader(rd), ird)
 		return nil
 	})
 	rtest.OK(t, err)

internal/test/helpers.go

@@ -48,7 +48,7 @@ func OKs(tb testing.TB, errs []error) {
 
 // Equals fails the test if exp is not equal to act.
 // msg is optional message to be printed, first param being format string and rest being arguments.
-func Equals(tb testing.TB, exp, act interface{}, msgs ...string) {
+func Equals[T any](tb testing.TB, exp, act T, msgs ...string) {
 	tb.Helper()
 	if !reflect.DeepEqual(exp, act) {
 		var msgString string

internal/ui/termstatus/status_test.go

@@ -128,7 +128,7 @@ func TestRawInputOutput(t *testing.T) {
 	defer cancel()
 	rtest.Equals(t, input, term.InputRaw())
 	rtest.Equals(t, false, term.InputIsTerminal())
-	rtest.Equals(t, &output, term.OutputRaw())
+	rtest.Equals(t, io.Writer(&output), term.OutputRaw())
 	rtest.Equals(t, false, term.OutputIsTerminal())
 	rtest.Equals(t, false, term.CanUpdateStatus())
 }