Add test for doc comments unindent fix

Author: GuillaumeGomez

src/librustdoc/passes/unindent_comments/tests.rs

@@ -1,26 +1,38 @@
 use super::*;
+use rustc_span::source_map::DUMMY_SP;
+
+fn create_doc_fragment(s: &str) -> Vec<DocFragment> {
+    vec![DocFragment {
+        line: 0,
+        span: DUMMY_SP,
+        parent_module: None,
+        doc: s.to_string(),
+        kind: DocFragmentKind::SugaredDoc,
+    }]
+}
+
+#[track_caller]
+fn run_test(input: &str, expected: &str) {
+    let mut s = create_doc_fragment(input);
+    unindent_fragments(&mut s);
+    assert_eq!(s[0].doc, expected);
+}
 
 #[test]
 fn should_unindent() {
-    let s = "    line1\n    line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\nline2");
+    run_test("    line1\n    line2", "line1\nline2");
 }
 
 #[test]
 fn should_unindent_multiple_paragraphs() {
-    let s = "    line1\n\n    line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\n\nline2");
+    run_test("    line1\n\n    line2", "line1\n\nline2");
 }
 
 #[test]
 fn should_leave_multiple_indent_levels() {
     // Line 2 is indented another level beyond the
     // base indentation and should be preserved
-    let s = "    line1\n\n        line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\n\n    line2");
+    run_test("    line1\n\n        line2", "line1\n\n    line2");
 }
 
 #[test]
@@ -30,43 +42,27 @@ fn should_ignore_first_line_indent() {
     //
     // #[doc = "Start way over here
     //          and continue here"]
-    let s = "line1\n    line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\nline2");
+    run_test("line1\n    line2", "line1\nline2");
 }
 
 #[test]
 fn should_not_ignore_first_line_indent_in_a_single_line_para() {
-    let s = "line1\n\n    line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\n\n    line2");
+    run_test("line1\n\n    line2", "line1\n\n    line2");
 }
 
 #[test]
 fn should_unindent_tabs() {
-    let s = "\tline1\n\tline2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\nline2");
+    run_test("\tline1\n\tline2", "line1\nline2");
 }
 
 #[test]
 fn should_trim_mixed_indentation() {
-    let s = "\t    line1\n\t    line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\nline2");
-
-    let s = "    \tline1\n    \tline2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1\nline2");
+    run_test("\t    line1\n\t    line2", "line1\nline2");
+    run_test("    \tline1\n    \tline2", "line1\nline2");
 }
 
 #[test]
 fn should_not_trim() {
-    let s = "\t    line1  \n\t    line2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1  \nline2");
-
-    let s = "    \tline1  \n    \tline2".to_string();
-    let r = unindent(&s);
-    assert_eq!(r, "line1  \nline2");
+    run_test("\t    line1  \n\t    line2", "line1  \nline2");
+    run_test("    \tline1  \n    \tline2", "line1  \nline2");
 }

src/test/rustdoc/unindent.rs

@@ -0,0 +1,23 @@
+#![crate_name = "foo"]
+
+// @has foo/struct.Example.html
+// @matches - '//pre[@class="rust rust-example-rendered"]' \
+//     '(?m)let example = Example::new\(\)\n    \.first\(\)\n    \.second\(\)\n    \.build\(\);\Z'
+/// ```rust
+/// let example = Example::new()
+///     .first()
+#[cfg_attr(not(feature = "one"), doc = "    .second()")]
+///     .build();
+/// ```
+pub struct Example;
+
+// @has foo/struct.F.html
+// @matches - '//pre[@class="rust rust-example-rendered"]' \
+//     '(?m)let example = Example::new\(\)\n    \.first\(\)\n    \.another\(\)\n    \.build\(\);\Z'
+///```rust
+///let example = Example::new()
+///    .first()
+#[cfg_attr(not(feature = "one"), doc = "    .another()")]
+///    .build();
+/// ```
+pub struct F;