Fix/issue 15 matrix getter

matrix.go

@@ -45,6 +45,11 @@ type MatrixCellID struct {
 	row int
 }
 
+// Row returns the row index associated with this ID
+func (id MatrixCellID) Row() int {
+	return id.row
+}
+
 // MatrixRow an accessor to a line in a Matrix structure
 // Line feed and return characters are trimmed from written strings to prevent breaking the layout of the matrix.
 type MatrixRow interface {

matrix_test.go

@@ -96,6 +96,7 @@ func TestMatrixGetRowByID(t *testing.T) {
 
 	assert.NoError(t, err)
 	assert.Equal(t, aRow, fetchedRow)
+	assert.Equal(t, 1, fetchedRow.ID().Row())
 }
 
 func TestMatrixGetRowByIdWithInvalidRange(t *testing.T) {

spinner_test.go

@@ -47,6 +47,23 @@ func TestSpinnerCancellation(t *testing.T) {
 	assertStoppedEventually(t, probedWriter, spin.(*spinner))
 }
 
+func TestSpinnerBuilder(t *testing.T) {
+	expectedTitle := test.RandomString()
+	expectedInterval := time.Millisecond * 123
+	emulatedStdout := new(bytes.Buffer)
+
+	spin := NewSpinnerBuilder().
+		WithWriter(emulatedStdout).
+		WithTitle(expectedTitle).
+		WithInterval(expectedInterval).
+		Build()
+
+	s := spin.(*spinner)
+	assert.Equal(t, emulatedStdout, s.writer)
+	assert.Equal(t, expectedTitle, s.title)
+	assert.Equal(t, expectedInterval, s.interval)
+}
+
 func TestSpinnerTitles(t *testing.T) {
 	t.Run("InitialTitle", func(t *testing.T) {
 		expectedTitle := test.RandomString()