Add a simple unit test to create a PDF file

The text does not appear in the document. The page size should be set to some
more sensible values.

We should probably check the output file, at least that it is not empty and
check that the header correspond to a valid PDF file.

.github/workflows/build.yml

@@ -33,6 +33,9 @@ jobs:
       - name: Setup
         run: |
           meson setup .build
-      - name: Build
+      - name: Dist Check
         run: |
           ninja dist -C .build
+      - name: Unit Tests
+        run: |
+          ninja test -C .build

meson.build

@@ -180,6 +180,8 @@ libtexpdf_dep = declare_dependency(
     link_with : libtexpdf,
 )
 
+subdir('tests')
+
 pkg.generate(libtexpdf,
     filebase : 'libtexpdf',
     name : 'libtexpdf',

tests/meson.build

@@ -0,0 +1,8 @@
+libtexpdf_include = include_directories('..')
+
+test_create = executable('test-create', 'test-create.c',
+    dependencies: libtexpdf_dep,
+    include_directories: libtexpdf_include,
+)
+
+test('Create a PDF file', test_create, args : ['pdf-test.pdf'])

tests/test-create.c

@@ -0,0 +1,59 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libtexpdf.h>
+
+double precision = 65536.0;
+char* producer = "SILE";
+
+pdf_doc *pdf_init (const char *fn, double w, double height) {
+  pdf_doc *p = texpdf_open_document(fn, 0, w, height, 0,0,0);
+  texpdf_init_device(p, 1 / precision, 2, 0);
+
+  pdf_rect mediabox;
+  mediabox.llx = 0.0;
+  mediabox.lly = 0.0;
+  mediabox.urx = w;
+  mediabox.ury = height;
+  texpdf_files_init();
+  texpdf_init_fontmaps();
+  texpdf_tt_aux_set_always_embed();
+  texpdf_doc_set_mediabox(p, 0, &mediabox);
+  texpdf_add_dict(p->info,
+               texpdf_new_name("Producer"),
+               texpdf_new_string(producer, strlen(producer)));
+  return p;
+}
+
+int pdf_finish(pdf_doc *p) {
+  texpdf_files_close();
+  texpdf_close_device();
+  texpdf_close_document(p);
+  texpdf_close_fontmaps();
+  return 0;
+}
+
+int pdf_add_content(pdf_doc *p, const char *input) {
+  int input_l = strlen(input);
+  texpdf_graphics_mode(p); /* Don't be mid-string! */
+  texpdf_doc_add_page_content(p, " ", 1);
+  texpdf_doc_add_page_content(p, input, input_l);
+  texpdf_doc_add_page_content(p, " ", 1);
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  if (argc != 2) {
+    fprintf(stderr, "usage: %s <output-file>\n", argv[0]);
+    return 1;
+  }
+  const char *filename = argv[1];
+  const double width = 400.0, height = 600.0;
+  pdf_doc *p = pdf_init(filename, width, height);
+  texpdf_doc_begin_page(p, 1, 0, height);
+  pdf_add_content(p, "Hello world!");
+  texpdf_doc_end_page(p);
+  pdf_finish(p);
+  return 0;
+}