tests/executable.rs: add a multi-bibtex executable test

tests/executable.rs

@@ -1,4 +1,4 @@
-// Copyright 2016-2021 the Tectonic Project
+// Copyright 2016-2022 the Tectonic Project
 // Licensed under the MIT License.
 
 use lazy_static::lazy_static;
@@ -448,6 +448,18 @@ fn biber_issue_844() {
     assert_eq!(stat.len(), contents.len() as u64);
 }
 
+/// Fakily testing the bibtex implementation even though we don't have LaTeX.
+/// This implementation is strongly cribbed from the biber tests, which came
+/// first.
+#[test]
+fn bibtex_multiple_aux_files() {
+    let fmt_arg = get_plain_format_arg();
+    let tempdir =
+        setup_and_copy_files(&["bibtex_multiple_aux_files.tex", "refs.bib", "catchkey.bst"]);
+    let output = run_tectonic(tempdir.path(), &[&fmt_arg, "bibtex_multiple_aux_files.tex"]);
+    success_or_panic(&output);
+}
+
 #[test]
 fn help_flag() {
     let output = run_tectonic(&PathBuf::from("."), &["-h"]);

tests/executable/bibtex_multiple_aux_files.tex

@@ -0,0 +1,53 @@
+% Test if we're on the second pass by seeing if the BBL already exists
+\newif\ifsecond
+\newread\r
+\openin\r=bibtex_multiple_aux_files.bbl
+\ifeof\r
+\message{first pass}
+\secondfalse
+\else
+\message{second pass}
+\secondtrue
+\closein\r
+\fi
+
+% Now create first .aux
+\newwrite\w
+\immediate\openout\w=bibtex_multiple_aux_files.aux\relax
+\immediate\write\w{\string\bibdata{refs}}
+\immediate\write\w{\string\citation{refA}}
+\immediate\write\w{\string\bibstyle{catchkey}}
+\immediate\closeout\w
+
+% Second .aux
+\immediate\openout\w=secondary.aux\relax
+\immediate\write\w{\string\bibdata{refs}}
+\immediate\write\w{\string\citation{refB}}
+\immediate\write\w{\string\bibstyle{catchkey}}
+\immediate\closeout\w
+
+hello
+
+% catchkey.bst emits a command `\saw$KEY` for each key it sees. So
+% we can check that we got keys from both files like so:
+
+\newif\ifrefA
+\refAfalse
+
+\newif\ifrefB
+\refBfalse
+
+\ifsecond
+  \let\sawrefA=\refAtrue
+  \let\sawrefB=\refBtrue
+  \input{bibtex_multiple_aux_files.bbl}
+  \input{secondary.bbl}
+  \ifrefA\else
+    \didnotseerefA
+  \fi
+  \ifrefB\else
+    \didnotseerefB
+  \fi
+\fi
+
+\bye

tests/executable/catchkey.bst

@@ -0,0 +1,11 @@
+ENTRY { author title year } {} {}
+
+FUNCTION { misc }
+{
+  "\saw" write$
+  cite$ write$
+  newline$
+}
+
+READ
+ITERATE {call.type$}

tests/executable/refs.bib

@@ -0,0 +1,11 @@
+@misc{refA,
+  author="No Body",
+  title="An Article",
+  year="2020"
+}
+
+@misc{refB,
+  author="An Other",
+  title="Rebuttal",
+  year="2021"
+}