test: Add initial test for hyperlink support

Author: scrabsha

tests/hyperlink.rs

@@ -0,0 +1,36 @@
+use annotate_snippets::{AnnotationKind, Level, Renderer, Snippet, renderer::DecorStyle};
+use snapbox::{assert_data_eq, file};
+
+#[test]
+fn simple() {
+    // Most basic test: check that the a hyperlink shows up in the error message displayed in the
+    // README.
+    let source = r#"                annotations: vec![SourceAnnotation {
+                label: "expected struct `annotate_snippets::snippet::Slice`, found reference"
+                    ,
+                range: <22, 25>,"#;
+    let report =
+        &[Level::ERROR
+            .primary_title("expected type, found `22`")
+            .element(
+                Snippet::source(source)
+                    .line_start(26)
+                    .path("examples/footer.rs")
+                    .annotation(AnnotationKind::Primary.span(193..195).label(
+                        "expected struct `annotate_snippets::snippet::Slice`, found reference",
+                    ))
+                    .annotation(
+                        AnnotationKind::Context
+                            .span(34..50)
+                            .label("while parsing this struct"),
+                    ),
+            )];
+
+    let expected_ascii = file!["hyperlink_expected_type.ascii.term.svg": TermSvg];
+    let renderer = Renderer::styled().decor_style(DecorStyle::Ascii);
+    assert_data_eq!(renderer.render(report), expected_ascii);
+
+    let expected_unicode = file!["hyperlink_expected_type.unicode.term.svg": TermSvg];
+    let renderer = Renderer::styled().decor_style(DecorStyle::Unicode);
+    assert_data_eq!(renderer.render(report), expected_unicode);
+}