notmuch: add example message with inline image.

notmuch/src/lib.rs

@@ -611,7 +611,7 @@ mod tests {
         let nm = Notmuch::with_config("testdata/notmuch.config");
         nm.new()?;
         let c = nm.count("*")?;
-        assert_eq!(c, 12);
+        assert_eq!(c, 13);
         Ok(())
     }
 
@@ -633,12 +633,14 @@ mod tests {
                         Part {
                             id: 2.into(),
                             content_type: "text/plain".to_string(),
+                            content_disposition: Some("inline".to_string()),
                             content: Some(Content::String("Spam detection software".to_string())),
                             ..Default::default()
                         },
                         Part {
                             id: 3.into(),
                             content_type: "message/rfc822".to_string(),
+                            content_disposition: Some("inline".to_string()),
                             content: Some(Content::Rfc822(vec![Rfc822 {
                                 headers: Headers {
                                     subject: "Re: Registration goof".to_string(),