Add UI tests for top level nodes

testing/tests/ui/blocks_below_top_level.rs

@@ -0,0 +1,29 @@
+use rinja::Template;
+
+#[derive(Template)]
+#[template(source = r#"
+{% block bla %}
+{% extends "bla.txt" %}
+{% endblock %}
+"#, ext = "txt")]
+struct MyTemplate1;
+
+#[derive(Template)]
+#[template(source = r#"
+{% block bla %}
+{% macro bla() %}
+{% endmacro %}
+{% endblock %}
+"#, ext = "txt")]
+struct MyTemplate2;
+
+#[derive(Template)]
+#[template(source = r#"
+{% block bla %}
+{% import "bla.txt" as blue %}
+{% endblock %}
+"#, ext = "txt")]
+struct MyTemplate3;
+
+fn main() {
+}

testing/tests/ui/blocks_below_top_level.stderr

@@ -0,0 +1,29 @@
+error: extends blocks are not allowed below top level
+ --> MyTemplate1.txt:3:2
+       " extends \"bla.txt\" %}\n{% endblock %}\n"
+ --> tests/ui/blocks_below_top_level.rs:3:10
+  |
+3 | #[derive(Template)]
+  |          ^^^^^^^^
+  |
+  = note: this error originates in the derive macro `Template` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: macro blocks are not allowed below top level
+ --> MyTemplate2.txt:3:2
+       " macro bla() %}\n{% endmacro %}\n{% endblo"...
+  --> tests/ui/blocks_below_top_level.rs:11:10
+   |
+11 | #[derive(Template)]
+   |          ^^^^^^^^
+   |
+   = note: this error originates in the derive macro `Template` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: import blocks are not allowed below top level
+ --> MyTemplate3.txt:3:2
+       " import \"bla.txt\" as blue %}\n{% endblock"...
+  --> tests/ui/blocks_below_top_level.rs:20:10
+   |
+20 | #[derive(Template)]
+   |          ^^^^^^^^
+   |
+   = note: this error originates in the derive macro `Template` (in Nightly builds, run with -Z macro-backtrace for more info)

testing/tests/ui/multiple_extends.rs

@@ -0,0 +1,10 @@
+use rinja::Template;
+
+#[derive(Template)]
+#[template(source = r#"
+{% extends "let.html" %}
+{% extends "foo.html" %}
+"#, ext = "txt")]
+struct MyTemplate4;
+
+fn main() {}

testing/tests/ui/multiple_extends.stderr

@@ -0,0 +1,9 @@
+error: multiple extend blocks found
+ --> MyTemplate4.txt:3:2
+       " extends \"foo.html\" %}\n"
+ --> tests/ui/multiple_extends.rs:3:10
+  |
+3 | #[derive(Template)]
+  |          ^^^^^^^^
+  |
+  = note: this error originates in the derive macro `Template` (in Nightly builds, run with -Z macro-backtrace for more info)