[librsvg/wip/aruiz/rust-pixbuf-loader] pixbuf-loader: add unit test to check error is returned

[Alberto Ruiz <aruiz src gnome org>]

commit 93c4ade4d8022b27fb56431274ca7c639bb45a67
Author: Alberto Ruiz <aruiz redhat com>
Date:   Tue Aug 9 20:04:00 2022 +0100

    pixbuf-loader: add unit test to check error is returned

 gdk-pixbuf-loader/src/lib.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
---
diff --git a/gdk-pixbuf-loader/src/lib.rs b/gdk-pixbuf-loader/src/lib.rs
index 40d992e30..e93c270e5 100644
--- a/gdk-pixbuf-loader/src/lib.rs
+++ b/gdk-pixbuf-loader/src/lib.rs
@@ -310,6 +310,13 @@ mod tests {
                                     </svg>
     "#;
 
+    const SVG_BROKEN: &'static str = r#"<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+                                    <svg
+                                    width="100px"
+                                    height="150px"
+                                    viewBox="0 0 26.458333 26.458333"
+                                    version="1.1" BROKEN DATA"#;
+
     #[test]
     fn minimal_svg() {
         unsafe extern "C" fn prep_cb(
@@ -369,4 +376,24 @@ mod tests {
 
         unsafe { crate::stop_load(ctx, null_mut()) };
     }
+
+    #[test]
+    fn broken_svg () {
+        let mut err: *mut glib_sys::GError = null_mut();
+
+        let ctx = unsafe { crate::begin_load(None, None, None, null_mut(), null_mut()) };
+        assert_ne!(ctx, null_mut());
+
+        let inc = unsafe {
+            crate::load_increment(ctx, SVG_BROKEN.as_ptr(), SVG_DATA.len() as u32, null_mut())
+        };
+        assert_ne!(inc, 0);
+
+        unsafe { crate::stop_load(ctx, &mut err as *mut *mut glib_sys::GError) };
+
+        // We just check if the error was set
+        assert!(err != null_mut());
+
+        unsafe { glib_sys::g_error_free(err) };
+    }
 }