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add_test.go
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add_test.go
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package rangeset
import "testing"
type (
AddType int // set element type used for "add" tests
)
const (
// maxAddtype is the maximum possible value of AddType.
// Note that we use uint because AddType (above) is int (uint and int have same number of bits)
maxAddType = AddType(^uint(0) >> 1)
// minAddtype is the minimum possible value of AddType.
// Note that this calculation assumes 2's-complement arithmetic but Go integers always use that
minAddType = -maxAddType - 1
)
var addData = map[string]struct {
elts []AddType // initial elements in the set
addElt AddType // element to be added
expResult bool // whether it should have been added or not (already existed)
expected []Span[AddType] // expected set of spans after elt was added
}{
"AddEmpty": {[]AddType{}, 42, true, []Span[AddType]{{42, 43}}},
"AddNegative": {[]AddType{}, -1, true, []Span[AddType]{{-1, 0}}},
"Add1Before": {[]AddType{42}, 40, true, []Span[AddType]{{40, 41}, {42, 43}}},
"AddAtStartRange": {[]AddType{42}, 41, true, []Span[AddType]{{41, 43}}},
"AddExisting": {[]AddType{42}, 42, false, []Span[AddType]{{42, 43}}},
"AddMin": {[]AddType{}, minAddType, true, []Span[AddType]{{minAddType, minAddType + 1}}},
"AddMax": {[]AddType{}, maxAddType, true, []Span[AddType]{{maxAddType, minAddType}}}, // wraps around
"AddExistingMin": {[]AddType{minAddType}, minAddType, false, []Span[AddType]{{minAddType, minAddType + 1}}},
"AddExistingMax": {[]AddType{maxAddType}, maxAddType, false, []Span[AddType]{{maxAddType, minAddType}}}, // wraps around
"AddMinToMax": {[]AddType{maxAddType}, minAddType, true, []Span[AddType]{{minAddType, minAddType + 1}, {maxAddType, minAddType}}}, // wraps around
"AddMaxToMin": {[]AddType{minAddType}, maxAddType, true, []Span[AddType]{{minAddType, minAddType + 1}, {maxAddType, minAddType}}}, // wraps around
"AddAtEndRange": {[]AddType{42}, 43, true, []Span[AddType]{{42, 44}}},
"AddAfter": {[]AddType{42}, 44, true, []Span[AddType]{{42, 43}, {44, 45}}},
"AddTo2BeforeFirst": {[]AddType{1, 3}, -1, true, []Span[AddType]{{-1, 0}, {1, 2}, {3, 4}}},
"AddTo2StartFirst": {[]AddType{1, 3}, 0, true, []Span[AddType]{{0, 2}, {3, 4}}},
"AddTo2InFirst": {[]AddType{1, 3}, 1, false, []Span[AddType]{{1, 2}, {3, 4}}},
"AddTo2Join1And2": {[]AddType{1, 3}, 2, true, []Span[AddType]{{1, 4}}},
"AddTo2In2nd": {[]AddType{1, 3}, 3, false, []Span[AddType]{{1, 2}, {3, 4}}},
"AddTo2EndLast": {[]AddType{1, 3}, 4, true, []Span[AddType]{{1, 2}, {3, 5}}},
"AddTo2AfterLast": {[]AddType{1, 3}, 5, true, []Span[AddType]{{1, 2}, {3, 4}, {5, 6}}},
"AddToR2ExtendFirst": {[]AddType{1, 10, 11}, 2, true, []Span[AddType]{{1, 3}, {10, 12}}},
"AddToR2NewRangeBetween": {[]AddType{1, 10, 11}, 3, true, []Span[AddType]{{1, 2}, {3, 4}, {10, 12}}},
"AddToR2ExtendBack2nd": {[]AddType{1, 10, 11}, 9, true, []Span[AddType]{{1, 2}, {9, 12}}},
"AddToR2Extend2nd": {[]AddType{1, 10, 11}, 12, true, []Span[AddType]{{1, 2}, {10, 13}}},
"AddToR2AfterLast": {[]AddType{1, 10, 11}, 1e9, true, []Span[AddType]{{1, 2}, {10, 12}, {1000000000, 1000000001}}},
"AddTo3BeforeFirst": {[]AddType{11, 12, 101, 1001, 1002}, 1, true, []Span[AddType]{{1, 2}, {11, 13}, {101, 102}, {1001, 1003}}},
"AddTo3StartFirst": {[]AddType{11, 12, 101, 1001, 1002}, 10, true, []Span[AddType]{{10, 13}, {101, 102}, {1001, 1003}}},
"AddTo3Before2nd": {[]AddType{11, 12, 101, 1001, 1002}, 20, true, []Span[AddType]{{11, 13}, {20, 21}, {101, 102}, {1001, 1003}}},
"AddTo3Start2nd": {[]AddType{11, 12, 101, 1001, 1002}, 100, true, []Span[AddType]{{11, 13}, {100, 102}, {1001, 1003}}},
"AddTo3In2nd": {[]AddType{11, 12, 101, 1001, 1002}, 101, false, []Span[AddType]{{11, 13}, {101, 102}, {1001, 1003}}},
"AddTo3End2nd": {[]AddType{11, 12, 101, 1001, 1002}, 102, true, []Span[AddType]{{11, 13}, {101, 103}, {1001, 1003}}},
"AddTo3Before3rd": {[]AddType{11, 12, 101, 1001, 1002}, 103, true, []Span[AddType]{{11, 13}, {101, 102}, {103, 104}, {1001, 1003}}},
"AddTo3End3rd": {[]AddType{11, 12, 101, 1001, 1002}, 1003, true, []Span[AddType]{{11, 13}, {101, 102}, {1001, 1004}}},
"AddTo3After3rd": {[]AddType{11, 12, 101, 1001, 1002}, 1004, true, []Span[AddType]{{11, 13}, {101, 102}, {1001, 1003}, {1004, 1005}}},
}
// TestTableAdd is a table driven test that adds an element (using Add() method) to a set taking data from the above
// addData map. It also tests the String() method.
func TestTableAdd(t *testing.T) {
for name, data := range addData {
s := Make(data.elts...)
gotResult := s.Add(data.addElt)
Assertf(t, gotResult == data.expResult, "%20s: expected result %t, got %t", name, data.expResult, gotResult)
Assertf(t, len(s) == len(data.expected), "%20s: expected %d ranges, got %d", name, len(data.expected), len(s))
for i := 0; i < len(data.expected); i++ {
Assertf(t, s[i].b == data.expected[i].b, "%20s: range %d got start=%v (expected %v)\n", name, i, s[i].b, data.expected[i].b)
Assertf(t, s[i].t == data.expected[i].t, "%20s: range %d got end=%v (expected %v)\n", name, i, s[i].t, data.expected[i].t)
}
}
}
// TestRoundTrip1 uses the addData table (above) to perform round trip tests, by
// converting a set to a string then back to a set. This provides extra tests of the
// String() method and the NewFromString() and Equal() functions.
func TestRoundTrip1(t *testing.T) {
for name, data := range addData {
s := Make(data.elts...)
got, err := NewFromString[AddType](s.String())
Assertf(t, err == nil, "%20s: Round trip string parsing expected no error, got %v", name, err)
same := Equal(s, got)
Assertf(t, same, "%20s: After round trip comparing %q: expected true, got %t", name, s.String(), same)
}
}
// TestAddReallocStart checks the special case where append() on the Span slice has to
// reallocate memory due to inserting lots of ranges at the beginning of the slice
func TestAddReallocStart(t *testing.T) {
s := NewFromRange[AddType](20, 40)
s.Add(2)
s.Add(4)
s.Add(6)
s.Add(8)
s.Add(10)
const expected = "{2,4,6,8,10,20:39}"
got := s.String()
Assertf(t, got == expected, "%24s: expected %q got %q\n", "AddReallocStart", expected, got)
}
// TestAddReallocMiddle checks the special case where append() on the Span slice has to
// reallocate memory due to inserting lots of ranges in the middle of the slice
func TestAddReallocMiddle(t *testing.T) {
s, _ := NewFromString[AddType]("{10:20,40:50}")
s.Add(22)
s.Add(24)
s.Add(26)
s.Add(28)
s.Add(30)
s.Add(32)
const expected = "{10:20,22,24,26,28,30,32,40:50}"
got := s.String()
Assertf(t, got == expected, "%24s: expected %q got %q\n", "AddReallocMiddle", expected, got)
}
// TestAddReallocEnd checks the special case where append() on the Span slice has to
// reallocate memory due to inserting lots of ranges at the end of the slice
func TestAddReallocEnd(t *testing.T) {
s := Make[AddType](10)
s.Add(22)
s.Add(24)
s.Add(26)
s.Add(28)
s.Add(30)
s.Add(32)
const expected = "{10,22,24,26,28,30,32}"
got := s.String()
Assertf(t, got == expected, "%24s: expected %q got %q\n", "AddReallocEnd", expected, got)
}
// TestAddUniversal tests adding to the start and end of the universal set
func TestAddUniversal(t *testing.T) {
U := Complement(Make[AddType]()) // complement of empty set is universal set
s := U.Copy()
got := s.Add(maxAddType)
Assertf(t, got == false, "%24s: expected false got %v\n", "AddUniversal max", got)
got = s.Add(minAddType)
Assertf(t, got == false, "%24s: expected false got %v\n", "AddUniversal min", got)
Assertf(t, Equal(s, U), "%24s: after adding to U expected %v got %v\n", "AddUniversal", U, s)
}
var rangeData = map[string]struct {
elts []AddType
bot, top AddType
expected string
}{
"AddRangeEmptyAdd1": {[]AddType{}, 42, 43, "{42}"},
"AddRangeEmptyAdd2": {[]AddType{}, 42, 44, "{42:43}"},
"AddRangeR1Before1": {[]AddType{4, 5, 6, 7}, 0, 3, "{0:2,4:7}"},
"AddRangeR1Before2": {[]AddType{4, 5, 6, 7}, 2, 3, "{2,4:7}"},
"AddRangeR1After1": {[]AddType{4, 5, 6, 7}, 9, 10, "{4:7,9}"},
"AddRangeR1After2": {[]AddType{4, 5, 6, 7}, 9, 12, "{4:7,9:11}"},
"AddRangeExtBelow3": {[]AddType{4, 5, 6, 7}, 1, 4, "{1:7}"},
"AddRangeExtBelow1": {[]AddType{4, 5, 6, 7}, 3, 4, "{3:7}"},
"AddRangeExtBelow1In1": {[]AddType{4, 5, 6, 7}, 3, 5, "{3:7}"},
"AddRangeExtAbove1": {[]AddType{4, 5, 6, 7}, 8, 9, "{4:8}"},
"AddRangeR1In2Above1": {[]AddType{4, 5, 6, 7}, 6, 9, "{4:8}"},
"AddRangeR1Above4": {[]AddType{4, 5, 6, 7}, 8, 12, "{4:11}"},
"AddRangeR1InStart1 ": {[]AddType{4, 5, 6, 7}, 4, 5, "{4:7}"},
"AddRangeR1InStart2": {[]AddType{4, 5, 6, 7}, 4, 6, "{4:7}"},
"AddRangeR1InStart3": {[]AddType{4, 5, 6, 7}, 4, 7, "{4:7}"},
"AddRangeR1InAll": {[]AddType{4, 5, 6, 7}, 4, 8, "{4:7}"},
"AddRangeR1In2": {[]AddType{4, 5, 6, 7}, 5, 7, "{4:7}"},
"AddRangeR1InEnd1": {[]AddType{4, 5, 6, 7}, 7, 8, "{4:7}"},
"AddRange3NewAfter1": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 5, 8, "{1:2,5:7,9,20:23}"},
"AddRange3AddStart2": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 5, 9, "{1:2,5:9,20:23}"},
"AddRange3MergeStart2": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 5, 10, "{1:2,5:9,20:23}"},
"AddRange2Replace2": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 5, 11, "{1:2,5:10,20:23}"},
"AddRange3AddEnd2": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 10, 11, "{1:2,9:10,20:23}"},
"AddRange3Merge2And3": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 5, 20, "{1:2,5:23}"},
"AddRange3Inside3": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 21, 22, "{1:2,9,20:23}"},
"AddRange3MergeAllBeg1": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 2, 30, "{1:29}"},
"AddRange3MergeAllBefore1": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 0, 30, "{0:29}"},
"AddRange3MergeAllEnd3": {[]AddType{1, 2, 9, 20, 21, 22, 23}, 0, 21, "{0:23}"},
}
// TestTableAddRange is a table driven test (using rangeData map above) that adds a range of elements to a set (using
// the AddRange() method). It also tests converting a set to a string (using the String() method()).
func TestTableAddRange(t *testing.T) {
for name, data := range rangeData {
s := Make(data.elts...)
s.AddRange(data.bot, data.top)
got := s.String()
Assertf(t, got == data.expected, "%24s: expected %q got %q\n", name, data.expected, got)
}
}
// TestRoundTrip2 uses the rangeData table (above) to perform round trip tests, by
// converting a set to a string then back to a set. This provides extra tests of the
// String() method and the NewFromString() and Equal() functions.
func TestRoundTrip2(t *testing.T) {
for name, data := range rangeData {
s := Make(data.elts...)
got, _ := NewFromString[AddType](s.String())
same := Equal(s, got)
Assertf(t, same, "%20s: After round trip comparing %q: expected true, got %t", name, s.String(), same)
}
}
// TestAddRangeReallocStart checks the special case where append() on the Span slice has to
// reallocate memory due to inserting lots of ranges at the beginning of the slice
func TestAddRangeReallocStart(t *testing.T) {
s := NewFromRange[AddType](20, 40)
s.AddRange(2, 3)
s.AddRange(4, 5)
s.AddRange(6, 7)
s.AddRange(8, 9)
s.AddRange(10, 11)
const expected = "{2,4,6,8,10,20:39}"
got := s.String()
Assertf(t, got == expected, "%24s: expected %q got %q\n", "AddRangeReallocStart", expected, got)
}
// TestAddRangeReallocMiddle checks the special case where append() on the Span slice has to
// reallocate memory due to inserting lots of ranges in the middle of the slice
func TestAddRangeReallocMiddle(t *testing.T) {
s, _ := NewFromString[AddType]("{10:20,40:50}")
s.AddRange(22, 23)
s.AddRange(24, 25)
s.AddRange(26, 27)
s.AddRange(28, 29)
s.AddRange(30, 31)
s.AddRange(32, 33)
const expected = "{10:20,22,24,26,28,30,32,40:50}"
got := s.String()
Assertf(t, got == expected, "%24s: expected %q got %q\n", "AddRangeReallocMiddle", expected, got)
}
// TestAddRangeReallocEnd checks the special case where append() on the Span slice has to
// reallocate memory due to inserting lots of ranges at the end of the slice
func TestAddRangeReallocEnd(t *testing.T) {
s := Make[AddType](10)
s.AddRange(22, 23)
s.AddRange(24, 25)
s.AddRange(26, 27)
s.AddRange(28, 29)
s.AddRange(30, 31)
s.AddRange(32, 33)
const expected = "{10,22,24,26,28,30,32}"
got := s.String()
Assertf(t, got == expected, "%24s: expected %q got %q\n", "AddRangeReallocEnd", expected, got)
}