ctoa_test.go

     1  // Copyright 2020 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 strconv_test
     6  
     7  import (
     8  	. "strconv"
     9  	"testing"
    10  )
    11  
    12  func TestFormatComplex(t *testing.T) {
    13  	tests := []struct {
    14  		c       complex128
    15  		fmt     byte
    16  		prec    int
    17  		bitSize int
    18  		out     string
    19  	}{
    20  		// a variety of signs
    21  		{1 + 2i, 'g', -1, 128, "(1+2i)"},
    22  		{3 - 4i, 'g', -1, 128, "(3-4i)"},
    23  		{-5 + 6i, 'g', -1, 128, "(-5+6i)"},
    24  		{-7 - 8i, 'g', -1, 128, "(-7-8i)"},
    25  
    26  		// test that fmt and prec are working
    27  		{3.14159 + 0.00123i, 'e', 3, 128, "(3.142e+00+1.230e-03i)"},
    28  		{3.14159 + 0.00123i, 'f', 3, 128, "(3.142+0.001i)"},
    29  		{3.14159 + 0.00123i, 'g', 3, 128, "(3.14+0.00123i)"},
    30  
    31  		// ensure bitSize rounding is working
    32  		{1.2345678901234567 + 9.876543210987654i, 'f', -1, 128, "(1.2345678901234567+9.876543210987654i)"},
    33  		{1.2345678901234567 + 9.876543210987654i, 'f', -1, 64, "(1.2345679+9.876543i)"},
    34  
    35  		// other cases are handled by FormatFloat tests
    36  	}
    37  	for _, test := range tests {
    38  		out := FormatComplex(test.c, test.fmt, test.prec, test.bitSize)
    39  		if out != test.out {
    40  			t.Fatalf("FormatComplex(%v, %q, %d, %d) = %q; want %q",
    41  				test.c, test.fmt, test.prec, test.bitSize, out, test.out)
    42  		}
    43  	}
    44  }
    45  
    46  func TestFormatComplexInvalidBitSize(t *testing.T) {
    47  	defer func() {
    48  		if r := recover(); r == nil {
    49  			t.Fatalf("expected panic due to invalid bitSize")
    50  		}
    51  	}()
    52  	_ = FormatComplex(1+2i, 'g', -1, 100)
    53  }
    54
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