github.com/bingoohuang/gg@v0.0.0-20240325092523-45da7dee9335/pkg/sqlparse/hack/hack_test.go (about)

     1  /*
     2  Copyright 2017 Google Inc.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package hack
    18  
    19  import "testing"
    20  
    21  func TestStringArena(t *testing.T) {
    22  	sarena := NewStringArena(10)
    23  
    24  	s0 := sarena.NewString(nil)
    25  	checkint(t, len(sarena.buf), 0)
    26  	checkint(t, sarena.SpaceLeft(), 10)
    27  	checkstring(t, s0, "")
    28  
    29  	s1 := sarena.NewString([]byte("01234"))
    30  	checkint(t, len(sarena.buf), 5)
    31  	checkint(t, sarena.SpaceLeft(), 5)
    32  	checkstring(t, s1, "01234")
    33  
    34  	s2 := sarena.NewString([]byte("5678"))
    35  	checkint(t, len(sarena.buf), 9)
    36  	checkint(t, sarena.SpaceLeft(), 1)
    37  	checkstring(t, s2, "5678")
    38  
    39  	// s3 will be allocated outside of sarena
    40  	s3 := sarena.NewString([]byte("ab"))
    41  	checkint(t, len(sarena.buf), 9)
    42  	checkint(t, sarena.SpaceLeft(), 1)
    43  	checkstring(t, s3, "ab")
    44  
    45  	// s4 should still fit in sarena
    46  	s4 := sarena.NewString([]byte("9"))
    47  	checkint(t, len(sarena.buf), 10)
    48  	checkint(t, sarena.SpaceLeft(), 0)
    49  	checkstring(t, s4, "9")
    50  
    51  	sarena.buf[0] = 'A'
    52  	checkstring(t, s1, "A1234")
    53  
    54  	sarena.buf[5] = 'B'
    55  	checkstring(t, s2, "B678")
    56  
    57  	sarena.buf[9] = 'C'
    58  	// s3 will not change
    59  	checkstring(t, s3, "ab")
    60  	checkstring(t, s4, "C")
    61  	checkstring(t, sarena.str, "A1234B678C")
    62  }
    63  
    64  func checkstring(t *testing.T, actual, expected string) {
    65  	if actual != expected {
    66  		t.Errorf("received %s, expecting %s", actual, expected)
    67  	}
    68  }
    69  
    70  func checkint(t *testing.T, actual, expected int) {
    71  	if actual != expected {
    72  		t.Errorf("received %d, expecting %d", actual, expected)
    73  	}
    74  }
    75  
    76  func TestByteToString(t *testing.T) {
    77  	v1 := []byte("1234")
    78  	if s := String(v1); s != "1234" {
    79  		t.Errorf("String(\"1234\"): %q, want 1234", s)
    80  	}
    81  
    82  	v1 = []byte("")
    83  	if s := String(v1); s != "" {
    84  		t.Errorf("String(\"\"): %q, want empty", s)
    85  	}
    86  
    87  	v1 = nil
    88  	if s := String(v1); s != "" {
    89  		t.Errorf("String(\"\"): %q, want empty", s)
    90  	}
    91  }