Function TestPosition_AdvanceN

pkg/sql/tokenizer/coverage_enhancement_test.go:223–276

TestPosition_AdvanceN tests the Position.AdvanceN method.

(t *testing.T)

// TestPosition_AdvanceN tests the Position.AdvanceN method.
func TestPosition_AdvanceN(t *testing.T) {
	t.Run("AdvanceN advances position by N characters", func(t *testing.T) {
		pos := NewPosition(1, 0)      // Line 1, index 0
		lineStarts := []int{0, 6, 12} // Line boundaries

		// Advance by 3 characters on first line
		pos.AdvanceN(3, lineStarts)
		if pos.Index != 3 {
			t.Errorf("AdvanceN(3) Index = %d, want 3", pos.Index)
		}
		if pos.Line != 1 {
			t.Errorf("AdvanceN(3) Line = %d, want 1", pos.Line)
		}

		// Advance to cross first newline (from index 3 to 7)
		pos.AdvanceN(4, lineStarts)
		if pos.Index != 7 {
			t.Errorf("AdvanceN(4) Index = %d, want 7", pos.Index)
		}
		if pos.Line != 2 {
			t.Errorf("AdvanceN crossing newline, Line = %d, want 2", pos.Line)
		}
	})

	t.Run("AdvanceN with zero does nothing", func(t *testing.T) {
		pos := NewPosition(1, 5)
		lineStarts := []int{0}

		originalIndex := pos.Index
		originalLine := pos.Line

		pos.AdvanceN(0, lineStarts)

		if pos.Index != originalIndex {
			t.Errorf("AdvanceN(0) changed Index from %d to %d", originalIndex, pos.Index)
		}
		if pos.Line != originalLine {
			t.Errorf("AdvanceN(0) changed Line from %d to %d", originalLine, pos.Line)
		}
	})

	t.Run("AdvanceN with negative does nothing", func(t *testing.T) {
		pos := NewPosition(1, 5)
		lineStarts := []int{0}

		originalIndex := pos.Index

		pos.AdvanceN(-5, lineStarts)

		if pos.Index != originalIndex {
			t.Errorf("AdvanceN(-5) changed Index from %d to %d", originalIndex, pos.Index)
		}
	})
}

// TestTokenizer_NewWithKeywords tests initialization with custom keywords.
func TestTokenizer_NewWithKeywords(t *testing.T) {