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There is a regression in pango_cairo_layout_path() where it fails if text contains a space character.
We get the problem using Pango 1.42.4, while it works without any problem using Pango 1.42.1

This is an example:

#include <cairo/cairo.h>
#include <pango/pango.h>
#include <pango/pangocairo.h>

int main(int argc, char **argv) {
    cairo_surface_t *surface;
    cairo_t         *cr;
    PangoLayout     *layout;

    /* create surface */
    surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, 200, 200);
    cr = cairo_create(surface);

    /* clear to all white background */
    cairo_set_source_rgb(cr, 1.0, 1.0, 1.0); /* white */
    cairo_paint(cr);

    /* create a simple pango layout */
    layout = pango_cairo_create_layout(cr);
    pango_layout_set_text(layout, "test string", -1);

    /* create path from text outline */
    pango_cairo_layout_path(cr, layout);
    /* stroke path */
    cairo_set_source_rgb(cr, 0.0, 0.0, 0.0); /* black */
    cairo_stroke(cr);

    /* output to a png file */
    cairo_surface_write_to_png (surface, "output.png");

    g_object_unref(layout);
    cairo_destroy(cr);
    cairo_surface_destroy(surface);
    return 0;
}

The output is just a blank surface, without any text. If we change "test string" to "teststring" we get the text

OS: Win10 Pango built from MSYS2