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test(search): add duplicate-element tests for binary search #801

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46 changes: 46 additions & 0 deletions search/binary_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,52 @@ func TestUpperBound(t *testing.T) {
}
}

func TestBinaryWithDuplicates(t *testing.T) {
arr := []int{1, 2, 4, 4, 4, 6, 7, 8}
target := 4

result, err := Binary(arr, target, 0, len(arr)-1)

if err != nil {
t.Fatalf("unexpected error: %v", err)
}

if result < 0 || result >= len(arr) {
t.Fatalf("returned invalid index: %d", result)
}

if arr[result] != target {
t.Fatalf(
"expected target %d at returned index, got %d",
target,
arr[result],
)
}
}

func TestBinaryIterativeWithDuplicates(t *testing.T) {
arr := []int{1, 2, 4, 4, 4, 6, 7, 8}
target := 4

result, err := BinaryIterative(arr, target)

if err != nil {
t.Fatalf("unexpected error: %v", err)
}

if result < 0 || result >= len(arr) {
t.Fatalf("returned invalid index: %d", result)
}

if arr[result] != target {
t.Fatalf(
"expected target %d at returned index, got %d",
target,
arr[result],
)
}
}

func BenchmarkBinary(b *testing.B) {
testCase := generateBenchmarkTestCase()
b.ResetTimer() // this is important because the generateBenchmarkTestCase() is expensive
Expand Down