Function TestLineOperations

pkg/gitdiff/parser_test.go:13–81

(t *testing.T)

)

func TestLineOperations(t *testing.T) {
	const content = "the first line\nthe second line\nthe third line\n"

	t.Run("read", func(t *testing.T) {
		p := newTestParser(content, false)

		for i, expected := range []string{
			"the first line\n",
			"the second line\n",
			"the third line\n",
		} {
			if err := p.Next(); err != nil {
				t.Fatalf("error advancing parser after line %d: %v", i, err)
			}
			if p.lineno != int64(i+1) {
				t.Fatalf("incorrect line number: expected %d, actual: %d", i+1, p.lineno)
			}

			line := p.Line(0)
			if line != expected {
				t.Fatalf("incorrect line %d: expected %q, was %q", i+1, expected, line)
			}
		}

		// reading after the last line should return EOF
		if err := p.Next(); err != io.EOF {
			t.Fatalf("expected EOF after end, but got: %v", err)
		}
		if p.lineno != 4 {
			t.Fatalf("incorrect line number: expected %d, actual: %d", 4, p.lineno)
		}

		// reading again returns EOF again and does not advance the line
		if err := p.Next(); err != io.EOF {
			t.Fatalf("expected EOF after end, but got: %v", err)
		}
		if p.lineno != 4 {
			t.Fatalf("incorrect line number: expected %d, actual: %d", 4, p.lineno)
		}
	})

	t.Run("peek", func(t *testing.T) {
		p := newTestParser(content, false)
		if err := p.Next(); err != nil {
			t.Fatalf("error advancing parser: %v", err)
		}

		line := p.Line(1)
		if line != "the second line\n" {
			t.Fatalf("incorrect peek line: %s", line)
		}

		if err := p.Next(); err != nil {
			t.Fatalf("error advancing parser after peek: %v", err)
		}

		line = p.Line(0)
		if line != "the second line\n" {