Cover toPluralForm

message/plural_test.go

@@ -1,6 +1,7 @@
 package message
 
 import (
+	"reflect"
 	"testing"
 
 	"golang.org/x/text/feature/plural"
@@ -171,3 +172,133 @@ func TestPlural_Eval(t *testing.T) {
 		})
 	}
 }
+
+func Test_toPluralForm(t *testing.T) {
+	tests := []struct {
+		name    string
+		num     any
+		want    pm
+		wantErr bool
+	}{
+		{
+			"int",
+			int(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"-int",
+			int(-42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"int8",
+			int8(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"-int8",
+			int8(-42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"int16",
+			int16(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"-int16",
+			int16(-42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"int32",
+			int32(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"-int32",
+			int32(-42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"int64",
+			int64(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"-int64",
+			int64(-42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"uint",
+			uint(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"uint8",
+			uint8(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"uint16",
+			uint16(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"uint32",
+			uint32(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"uint64",
+			uint64(42),
+			pm{i: 42},
+			false,
+		},
+		{
+			"error on unknown type",
+			[]byte("foo"),
+			pm{},
+			true,
+		},
+		{
+			"float string",
+			"42.4200",
+			pm{i: 42, v: 4, w: 2, f: 4200, t: 42},
+			false,
+		},
+		{
+			"float string",
+			"1200.50",
+			pm{i: 1200, v: 2, w: 1, f: 50, t: 5},
+			false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := toPluralForm(tt.num)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("toPluralForm() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("toPluralForm() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}