Source file src/database/sql/convert_test.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package sql
     6  
     7  import (
     8  	"database/sql/driver"
     9  	"fmt"
    10  	"reflect"
    11  	"runtime"
    12  	"strings"
    13  	"sync"
    14  	"testing"
    15  	"time"
    16  )
    17  
    18  var someTime = time.Unix(123, 0)
    19  var answer int64 = 42
    20  
    21  type (
    22  	userDefined       float64
    23  	userDefinedSlice  []int
    24  	userDefinedString string
    25  )
    26  
    27  type conversionTest struct {
    28  	s, d any // source and destination
    29  
    30  	// following are used if they're non-zero
    31  	wantint    int64
    32  	wantuint   uint64
    33  	wantstr    string
    34  	wantbytes  []byte
    35  	wantraw    RawBytes
    36  	wantf32    float32
    37  	wantf64    float64
    38  	wanttime   time.Time
    39  	wantbool   bool // used if d is of type *bool
    40  	wanterr    string
    41  	wantiface  any
    42  	wantptr    *int64 // if non-nil, *d's pointed value must be equal to *wantptr
    43  	wantnil    bool   // if true, *d must be *int64(nil)
    44  	wantusrdef userDefined
    45  	wantusrstr userDefinedString
    46  }
    47  
    48  // Target variables for scanning into.
    49  var (
    50  	scanstr    string
    51  	scanbytes  []byte
    52  	scanraw    RawBytes
    53  	scanint    int
    54  	scanuint8  uint8
    55  	scanuint16 uint16
    56  	scanbool   bool
    57  	scanf32    float32
    58  	scanf64    float64
    59  	scantime   time.Time
    60  	scanptr    *int64
    61  	scaniface  any
    62  )
    63  
    64  func conversionTests() []conversionTest {
    65  	// Return a fresh instance to test so "go test -count 2" works correctly.
    66  	return []conversionTest{
    67  		// Exact conversions (destination pointer type matches source type)
    68  		{s: "foo", d: &scanstr, wantstr: "foo"},
    69  		{s: 123, d: &scanint, wantint: 123},
    70  		{s: someTime, d: &scantime, wanttime: someTime},
    71  
    72  		// To strings
    73  		{s: "string", d: &scanstr, wantstr: "string"},
    74  		{s: []byte("byteslice"), d: &scanstr, wantstr: "byteslice"},
    75  		{s: 123, d: &scanstr, wantstr: "123"},
    76  		{s: int8(123), d: &scanstr, wantstr: "123"},
    77  		{s: int64(123), d: &scanstr, wantstr: "123"},
    78  		{s: uint8(123), d: &scanstr, wantstr: "123"},
    79  		{s: uint16(123), d: &scanstr, wantstr: "123"},
    80  		{s: uint32(123), d: &scanstr, wantstr: "123"},
    81  		{s: uint64(123), d: &scanstr, wantstr: "123"},
    82  		{s: 1.5, d: &scanstr, wantstr: "1.5"},
    83  
    84  		// From time.Time:
    85  		{s: time.Unix(1, 0).UTC(), d: &scanstr, wantstr: "1970-01-01T00:00:01Z"},
    86  		{s: time.Unix(1453874597, 0).In(time.FixedZone("here", -3600*8)), d: &scanstr, wantstr: "2016-01-26T22:03:17-08:00"},
    87  		{s: time.Unix(1, 2).UTC(), d: &scanstr, wantstr: "1970-01-01T00:00:01.000000002Z"},
    88  		{s: time.Time{}, d: &scanstr, wantstr: "0001-01-01T00:00:00Z"},
    89  		{s: time.Unix(1, 2).UTC(), d: &scanbytes, wantbytes: []byte("1970-01-01T00:00:01.000000002Z")},
    90  		{s: time.Unix(1, 2).UTC(), d: &scaniface, wantiface: time.Unix(1, 2).UTC()},
    91  
    92  		// To []byte
    93  		{s: nil, d: &scanbytes, wantbytes: nil},
    94  		{s: "string", d: &scanbytes, wantbytes: []byte("string")},
    95  		{s: []byte("byteslice"), d: &scanbytes, wantbytes: []byte("byteslice")},
    96  		{s: 123, d: &scanbytes, wantbytes: []byte("123")},
    97  		{s: int8(123), d: &scanbytes, wantbytes: []byte("123")},
    98  		{s: int64(123), d: &scanbytes, wantbytes: []byte("123")},
    99  		{s: uint8(123), d: &scanbytes, wantbytes: []byte("123")},
   100  		{s: uint16(123), d: &scanbytes, wantbytes: []byte("123")},
   101  		{s: uint32(123), d: &scanbytes, wantbytes: []byte("123")},
   102  		{s: uint64(123), d: &scanbytes, wantbytes: []byte("123")},
   103  		{s: 1.5, d: &scanbytes, wantbytes: []byte("1.5")},
   104  
   105  		// To RawBytes
   106  		{s: nil, d: &scanraw, wantraw: nil},
   107  		{s: []byte("byteslice"), d: &scanraw, wantraw: RawBytes("byteslice")},
   108  		{s: "string", d: &scanraw, wantraw: RawBytes("string")},
   109  		{s: 123, d: &scanraw, wantraw: RawBytes("123")},
   110  		{s: int8(123), d: &scanraw, wantraw: RawBytes("123")},
   111  		{s: int64(123), d: &scanraw, wantraw: RawBytes("123")},
   112  		{s: uint8(123), d: &scanraw, wantraw: RawBytes("123")},
   113  		{s: uint16(123), d: &scanraw, wantraw: RawBytes("123")},
   114  		{s: uint32(123), d: &scanraw, wantraw: RawBytes("123")},
   115  		{s: uint64(123), d: &scanraw, wantraw: RawBytes("123")},
   116  		{s: 1.5, d: &scanraw, wantraw: RawBytes("1.5")},
   117  		// time.Time has been placed here to check that the RawBytes slice gets
   118  		// correctly reset when calling time.Time.AppendFormat.
   119  		{s: time.Unix(2, 5).UTC(), d: &scanraw, wantraw: RawBytes("1970-01-01T00:00:02.000000005Z")},
   120  
   121  		// Strings to integers
   122  		{s: "255", d: &scanuint8, wantuint: 255},
   123  		{s: "256", d: &scanuint8, wanterr: "converting driver.Value type string (\"256\") to a uint8: value out of range"},
   124  		{s: "256", d: &scanuint16, wantuint: 256},
   125  		{s: "-1", d: &scanint, wantint: -1},
   126  		{s: "foo", d: &scanint, wanterr: "converting driver.Value type string (\"foo\") to a int: invalid syntax"},
   127  
   128  		// int64 to smaller integers
   129  		{s: int64(5), d: &scanuint8, wantuint: 5},
   130  		{s: int64(256), d: &scanuint8, wanterr: "converting driver.Value type int64 (\"256\") to a uint8: value out of range"},
   131  		{s: int64(256), d: &scanuint16, wantuint: 256},
   132  		{s: int64(65536), d: &scanuint16, wanterr: "converting driver.Value type int64 (\"65536\") to a uint16: value out of range"},
   133  
   134  		// True bools
   135  		{s: true, d: &scanbool, wantbool: true},
   136  		{s: "True", d: &scanbool, wantbool: true},
   137  		{s: "TRUE", d: &scanbool, wantbool: true},
   138  		{s: "1", d: &scanbool, wantbool: true},
   139  		{s: 1, d: &scanbool, wantbool: true},
   140  		{s: int64(1), d: &scanbool, wantbool: true},
   141  		{s: uint16(1), d: &scanbool, wantbool: true},
   142  
   143  		// False bools
   144  		{s: false, d: &scanbool, wantbool: false},
   145  		{s: "false", d: &scanbool, wantbool: false},
   146  		{s: "FALSE", d: &scanbool, wantbool: false},
   147  		{s: "0", d: &scanbool, wantbool: false},
   148  		{s: 0, d: &scanbool, wantbool: false},
   149  		{s: int64(0), d: &scanbool, wantbool: false},
   150  		{s: uint16(0), d: &scanbool, wantbool: false},
   151  
   152  		// Not bools
   153  		{s: "yup", d: &scanbool, wanterr: `sql/driver: couldn't convert "yup" into type bool`},
   154  		{s: 2, d: &scanbool, wanterr: `sql/driver: couldn't convert 2 into type bool`},
   155  
   156  		// Floats
   157  		{s: float64(1.5), d: &scanf64, wantf64: float64(1.5)},
   158  		{s: int64(1), d: &scanf64, wantf64: float64(1)},
   159  		{s: float64(1.5), d: &scanf32, wantf32: float32(1.5)},
   160  		{s: "1.5", d: &scanf32, wantf32: float32(1.5)},
   161  		{s: "1.5", d: &scanf64, wantf64: float64(1.5)},
   162  
   163  		// Pointers
   164  		{s: any(nil), d: &scanptr, wantnil: true},
   165  		{s: int64(42), d: &scanptr, wantptr: &answer},
   166  
   167  		// To interface{}
   168  		{s: float64(1.5), d: &scaniface, wantiface: float64(1.5)},
   169  		{s: int64(1), d: &scaniface, wantiface: int64(1)},
   170  		{s: "str", d: &scaniface, wantiface: "str"},
   171  		{s: []byte("byteslice"), d: &scaniface, wantiface: []byte("byteslice")},
   172  		{s: true, d: &scaniface, wantiface: true},
   173  		{s: nil, d: &scaniface},
   174  		{s: []byte(nil), d: &scaniface, wantiface: []byte(nil)},
   175  
   176  		// To a user-defined type
   177  		{s: 1.5, d: new(userDefined), wantusrdef: 1.5},
   178  		{s: int64(123), d: new(userDefined), wantusrdef: 123},
   179  		{s: "1.5", d: new(userDefined), wantusrdef: 1.5},
   180  		{s: []byte{1, 2, 3}, d: new(userDefinedSlice), wanterr: `unsupported Scan, storing driver.Value type []uint8 into type *sql.userDefinedSlice`},
   181  		{s: "str", d: new(userDefinedString), wantusrstr: "str"},
   182  
   183  		// Other errors
   184  		{s: complex(1, 2), d: &scanstr, wanterr: `unsupported Scan, storing driver.Value type complex128 into type *string`},
   185  	}
   186  }
   187  
   188  func intPtrValue(intptr any) any {
   189  	return reflect.Indirect(reflect.Indirect(reflect.ValueOf(intptr))).Int()
   190  }
   191  
   192  func intValue(intptr any) int64 {
   193  	return reflect.Indirect(reflect.ValueOf(intptr)).Int()
   194  }
   195  
   196  func uintValue(intptr any) uint64 {
   197  	return reflect.Indirect(reflect.ValueOf(intptr)).Uint()
   198  }
   199  
   200  func float64Value(ptr any) float64 {
   201  	return *(ptr.(*float64))
   202  }
   203  
   204  func float32Value(ptr any) float32 {
   205  	return *(ptr.(*float32))
   206  }
   207  
   208  func timeValue(ptr any) time.Time {
   209  	return *(ptr.(*time.Time))
   210  }
   211  
   212  func TestConversions(t *testing.T) {
   213  	for n, ct := range conversionTests() {
   214  		err := convertAssign(ct.d, ct.s)
   215  		errstr := ""
   216  		if err != nil {
   217  			errstr = err.Error()
   218  		}
   219  		errf := func(format string, args ...any) {
   220  			base := fmt.Sprintf("convertAssign #%d: for %v (%T) -> %T, ", n, ct.s, ct.s, ct.d)
   221  			t.Errorf(base+format, args...)
   222  		}
   223  		if errstr != ct.wanterr {
   224  			errf("got error %q, want error %q", errstr, ct.wanterr)
   225  		}
   226  		if ct.wantstr != "" && ct.wantstr != scanstr {
   227  			errf("want string %q, got %q", ct.wantstr, scanstr)
   228  		}
   229  		if ct.wantbytes != nil && string(ct.wantbytes) != string(scanbytes) {
   230  			errf("want byte %q, got %q", ct.wantbytes, scanbytes)
   231  		}
   232  		if ct.wantraw != nil && string(ct.wantraw) != string(scanraw) {
   233  			errf("want RawBytes %q, got %q", ct.wantraw, scanraw)
   234  		}
   235  		if ct.wantint != 0 && ct.wantint != intValue(ct.d) {
   236  			errf("want int %d, got %d", ct.wantint, intValue(ct.d))
   237  		}
   238  		if ct.wantuint != 0 && ct.wantuint != uintValue(ct.d) {
   239  			errf("want uint %d, got %d", ct.wantuint, uintValue(ct.d))
   240  		}
   241  		if ct.wantf32 != 0 && ct.wantf32 != float32Value(ct.d) {
   242  			errf("want float32 %v, got %v", ct.wantf32, float32Value(ct.d))
   243  		}
   244  		if ct.wantf64 != 0 && ct.wantf64 != float64Value(ct.d) {
   245  			errf("want float32 %v, got %v", ct.wantf64, float64Value(ct.d))
   246  		}
   247  		if bp, boolTest := ct.d.(*bool); boolTest && *bp != ct.wantbool && ct.wanterr == "" {
   248  			errf("want bool %v, got %v", ct.wantbool, *bp)
   249  		}
   250  		if !ct.wanttime.IsZero() && !ct.wanttime.Equal(timeValue(ct.d)) {
   251  			errf("want time %v, got %v", ct.wanttime, timeValue(ct.d))
   252  		}
   253  		if ct.wantnil && *ct.d.(**int64) != nil {
   254  			errf("want nil, got %v", intPtrValue(ct.d))
   255  		}
   256  		if ct.wantptr != nil {
   257  			if *ct.d.(**int64) == nil {
   258  				errf("want pointer to %v, got nil", *ct.wantptr)
   259  			} else if *ct.wantptr != intPtrValue(ct.d) {
   260  				errf("want pointer to %v, got %v", *ct.wantptr, intPtrValue(ct.d))
   261  			}
   262  		}
   263  		if ifptr, ok := ct.d.(*any); ok {
   264  			if !reflect.DeepEqual(ct.wantiface, scaniface) {
   265  				errf("want interface %#v, got %#v", ct.wantiface, scaniface)
   266  				continue
   267  			}
   268  			if srcBytes, ok := ct.s.([]byte); ok {
   269  				dstBytes := (*ifptr).([]byte)
   270  				if len(srcBytes) > 0 && &dstBytes[0] == &srcBytes[0] {
   271  					errf("copy into interface{} didn't copy []byte data")
   272  				}
   273  			}
   274  		}
   275  		if ct.wantusrdef != 0 && ct.wantusrdef != *ct.d.(*userDefined) {
   276  			errf("want userDefined %f, got %f", ct.wantusrdef, *ct.d.(*userDefined))
   277  		}
   278  		if len(ct.wantusrstr) != 0 && ct.wantusrstr != *ct.d.(*userDefinedString) {
   279  			errf("want userDefined %q, got %q", ct.wantusrstr, *ct.d.(*userDefinedString))
   280  		}
   281  	}
   282  }
   283  
   284  func TestNullString(t *testing.T) {
   285  	var ns NullString
   286  	convertAssign(&ns, []byte("foo"))
   287  	if !ns.Valid {
   288  		t.Errorf("expecting not null")
   289  	}
   290  	if ns.String != "foo" {
   291  		t.Errorf("expecting foo; got %q", ns.String)
   292  	}
   293  	convertAssign(&ns, nil)
   294  	if ns.Valid {
   295  		t.Errorf("expecting null on nil")
   296  	}
   297  	if ns.String != "" {
   298  		t.Errorf("expecting blank on nil; got %q", ns.String)
   299  	}
   300  }
   301  
   302  type valueConverterTest struct {
   303  	c       driver.ValueConverter
   304  	in, out any
   305  	err     string
   306  }
   307  
   308  var valueConverterTests = []valueConverterTest{
   309  	{driver.DefaultParameterConverter, NullString{"hi", true}, "hi", ""},
   310  	{driver.DefaultParameterConverter, NullString{"", false}, nil, ""},
   311  }
   312  
   313  func TestValueConverters(t *testing.T) {
   314  	for i, tt := range valueConverterTests {
   315  		out, err := tt.c.ConvertValue(tt.in)
   316  		goterr := ""
   317  		if err != nil {
   318  			goterr = err.Error()
   319  		}
   320  		if goterr != tt.err {
   321  			t.Errorf("test %d: %T(%T(%v)) error = %q; want error = %q",
   322  				i, tt.c, tt.in, tt.in, goterr, tt.err)
   323  		}
   324  		if tt.err != "" {
   325  			continue
   326  		}
   327  		if !reflect.DeepEqual(out, tt.out) {
   328  			t.Errorf("test %d: %T(%T(%v)) = %v (%T); want %v (%T)",
   329  				i, tt.c, tt.in, tt.in, out, out, tt.out, tt.out)
   330  		}
   331  	}
   332  }
   333  
   334  // Tests that assigning to RawBytes doesn't allocate (and also works).
   335  func TestRawBytesAllocs(t *testing.T) {
   336  	var tests = []struct {
   337  		name string
   338  		in   any
   339  		want string
   340  	}{
   341  		{"uint64", uint64(12345678), "12345678"},
   342  		{"uint32", uint32(1234), "1234"},
   343  		{"uint16", uint16(12), "12"},
   344  		{"uint8", uint8(1), "1"},
   345  		{"uint", uint(123), "123"},
   346  		{"int", int(123), "123"},
   347  		{"int8", int8(1), "1"},
   348  		{"int16", int16(12), "12"},
   349  		{"int32", int32(1234), "1234"},
   350  		{"int64", int64(12345678), "12345678"},
   351  		{"float32", float32(1.5), "1.5"},
   352  		{"float64", float64(64), "64"},
   353  		{"bool", false, "false"},
   354  		{"time", time.Unix(2, 5).UTC(), "1970-01-01T00:00:02.000000005Z"},
   355  	}
   356  
   357  	buf := make(RawBytes, 10)
   358  	test := func(name string, in any, want string) {
   359  		if err := convertAssign(&buf, in); err != nil {
   360  			t.Fatalf("%s: convertAssign = %v", name, err)
   361  		}
   362  		match := len(buf) == len(want)
   363  		if match {
   364  			for i, b := range buf {
   365  				if want[i] != b {
   366  					match = false
   367  					break
   368  				}
   369  			}
   370  		}
   371  		if !match {
   372  			t.Fatalf("%s: got %q (len %d); want %q (len %d)", name, buf, len(buf), want, len(want))
   373  		}
   374  	}
   375  
   376  	n := testing.AllocsPerRun(100, func() {
   377  		for _, tt := range tests {
   378  			test(tt.name, tt.in, tt.want)
   379  		}
   380  	})
   381  
   382  	// The numbers below are only valid for 64-bit interface word sizes,
   383  	// and gc. With 32-bit words there are more convT2E allocs, and
   384  	// with gccgo, only pointers currently go in interface data.
   385  	// So only care on amd64 gc for now.
   386  	measureAllocs := runtime.GOARCH == "amd64" && runtime.Compiler == "gc"
   387  
   388  	if n > 0.5 && measureAllocs {
   389  		t.Fatalf("allocs = %v; want 0", n)
   390  	}
   391  
   392  	// This one involves a convT2E allocation, string -> interface{}
   393  	n = testing.AllocsPerRun(100, func() {
   394  		test("string", "foo", "foo")
   395  	})
   396  	if n > 1.5 && measureAllocs {
   397  		t.Fatalf("allocs = %v; want max 1", n)
   398  	}
   399  }
   400  
   401  // https://golang.org/issues/13905
   402  func TestUserDefinedBytes(t *testing.T) {
   403  	type userDefinedBytes []byte
   404  	var u userDefinedBytes
   405  	v := []byte("foo")
   406  
   407  	convertAssign(&u, v)
   408  	if &u[0] == &v[0] {
   409  		t.Fatal("userDefinedBytes got potentially dirty driver memory")
   410  	}
   411  }
   412  
   413  type Valuer_V string
   414  
   415  func (v Valuer_V) Value() (driver.Value, error) {
   416  	return strings.ToUpper(string(v)), nil
   417  }
   418  
   419  type Valuer_P string
   420  
   421  func (p *Valuer_P) Value() (driver.Value, error) {
   422  	if p == nil {
   423  		return "nil-to-str", nil
   424  	}
   425  	return strings.ToUpper(string(*p)), nil
   426  }
   427  
   428  func TestDriverArgs(t *testing.T) {
   429  	var nilValuerVPtr *Valuer_V
   430  	var nilValuerPPtr *Valuer_P
   431  	var nilStrPtr *string
   432  	tests := []struct {
   433  		args []any
   434  		want []driver.NamedValue
   435  	}{
   436  		0: {
   437  			args: []any{Valuer_V("foo")},
   438  			want: []driver.NamedValue{
   439  				{
   440  					Ordinal: 1,
   441  					Value:   "FOO",
   442  				},
   443  			},
   444  		},
   445  		1: {
   446  			args: []any{nilValuerVPtr},
   447  			want: []driver.NamedValue{
   448  				{
   449  					Ordinal: 1,
   450  					Value:   nil,
   451  				},
   452  			},
   453  		},
   454  		2: {
   455  			args: []any{nilValuerPPtr},
   456  			want: []driver.NamedValue{
   457  				{
   458  					Ordinal: 1,
   459  					Value:   "nil-to-str",
   460  				},
   461  			},
   462  		},
   463  		3: {
   464  			args: []any{"plain-str"},
   465  			want: []driver.NamedValue{
   466  				{
   467  					Ordinal: 1,
   468  					Value:   "plain-str",
   469  				},
   470  			},
   471  		},
   472  		4: {
   473  			args: []any{nilStrPtr},
   474  			want: []driver.NamedValue{
   475  				{
   476  					Ordinal: 1,
   477  					Value:   nil,
   478  				},
   479  			},
   480  		},
   481  	}
   482  	for i, tt := range tests {
   483  		ds := &driverStmt{Locker: &sync.Mutex{}, si: stubDriverStmt{nil}}
   484  		got, err := driverArgsConnLocked(nil, ds, tt.args)
   485  		if err != nil {
   486  			t.Errorf("test[%d]: %v", i, err)
   487  			continue
   488  		}
   489  		if !reflect.DeepEqual(got, tt.want) {
   490  			t.Errorf("test[%d]: got %v, want %v", i, got, tt.want)
   491  		}
   492  	}
   493  }
   494  
   495  type dec struct {
   496  	form        byte
   497  	neg         bool
   498  	coefficient [16]byte
   499  	exponent    int32
   500  }
   501  
   502  func (d dec) Decompose(buf []byte) (form byte, negative bool, coefficient []byte, exponent int32) {
   503  	coef := make([]byte, 16)
   504  	copy(coef, d.coefficient[:])
   505  	return d.form, d.neg, coef, d.exponent
   506  }
   507  
   508  func (d *dec) Compose(form byte, negative bool, coefficient []byte, exponent int32) error {
   509  	switch form {
   510  	default:
   511  		return fmt.Errorf("unknown form %d", form)
   512  	case 1, 2:
   513  		d.form = form
   514  		d.neg = negative
   515  		return nil
   516  	case 0:
   517  	}
   518  	d.form = form
   519  	d.neg = negative
   520  	d.exponent = exponent
   521  
   522  	// This isn't strictly correct, as the extra bytes could be all zero,
   523  	// ignore this for this test.
   524  	if len(coefficient) > 16 {
   525  		return fmt.Errorf("coefficient too large")
   526  	}
   527  	copy(d.coefficient[:], coefficient)
   528  
   529  	return nil
   530  }
   531  
   532  type decFinite struct {
   533  	neg         bool
   534  	coefficient [16]byte
   535  	exponent    int32
   536  }
   537  
   538  func (d decFinite) Decompose(buf []byte) (form byte, negative bool, coefficient []byte, exponent int32) {
   539  	coef := make([]byte, 16)
   540  	copy(coef, d.coefficient[:])
   541  	return 0, d.neg, coef, d.exponent
   542  }
   543  
   544  func (d *decFinite) Compose(form byte, negative bool, coefficient []byte, exponent int32) error {
   545  	switch form {
   546  	default:
   547  		return fmt.Errorf("unknown form %d", form)
   548  	case 1, 2:
   549  		return fmt.Errorf("unsupported form %d", form)
   550  	case 0:
   551  	}
   552  	d.neg = negative
   553  	d.exponent = exponent
   554  
   555  	// This isn't strictly correct, as the extra bytes could be all zero,
   556  	// ignore this for this test.
   557  	if len(coefficient) > 16 {
   558  		return fmt.Errorf("coefficient too large")
   559  	}
   560  	copy(d.coefficient[:], coefficient)
   561  
   562  	return nil
   563  }
   564  
   565  func TestDecimal(t *testing.T) {
   566  	list := []struct {
   567  		name string
   568  		in   decimalDecompose
   569  		out  dec
   570  		err  bool
   571  	}{
   572  		{name: "same", in: dec{exponent: -6}, out: dec{exponent: -6}},
   573  
   574  		// Ensure reflection is not used to assign the value by using different types.
   575  		{name: "diff", in: decFinite{exponent: -6}, out: dec{exponent: -6}},
   576  
   577  		{name: "bad-form", in: dec{form: 200}, err: true},
   578  	}
   579  	for _, item := range list {
   580  		t.Run(item.name, func(t *testing.T) {
   581  			out := dec{}
   582  			err := convertAssign(&out, item.in)
   583  			if item.err {
   584  				if err == nil {
   585  					t.Fatalf("unexpected nil error")
   586  				}
   587  				return
   588  			}
   589  			if err != nil {
   590  				t.Fatalf("unexpected error: %v", err)
   591  			}
   592  			if !reflect.DeepEqual(out, item.out) {
   593  				t.Fatalf("got %#v want %#v", out, item.out)
   594  			}
   595  		})
   596  	}
   597  }
   598  

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