Tests the #comp_text_node portions of the AccName Name Computation algorithm.

# text/element/text nodes, no space

buttonlabel
headinglabel

### headinglabel

linklabel

# text/comment/text nodes, no space

buttonlabel
headinglabel

### headinglabel

linklabel

# text/comment/text nodes, with space

button label
heading label

### heading label

link label

# text node, with tab char

button label
heading label

### heading label

link label

# text node, with non-breaking space

button label
heading label

### heading label

link label

# text node, with extra non-breaking space

button label
heading label

### heading label

link label

# text node, with leading/trailing non-breaking space

button label
heading label

### heading label

link label

# text node, with mixed space and non-breaking space

button label
heading label

### heading label

link label

# text nodes, with deeply nested space

button label
heading label

### heading label

link label

# text nodes, with single line break

button label
heading label

### heading label

link label