[recipes/unit_convert_test: 10/10] Add a skeleton for a conversion test

[Matthias Clasen <matthiasc src gnome org>]

commit bd6ca280f4d9132aa6a3fd8d2626f5cbd3c279be
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 12 18:26:25 2017 -0400

    Add a skeleton for a conversion test
    
    This test expects input in convert-data/*.in files, each
    line in the form
    AMOUNT UNIT
    and will compare the output of human_readable() on with
    the RESULT in the corresponding .expected file.

 tests/convert-data/convert1.expected |    3 +
 tests/convert-data/convert1.in       |    1 +
 tests/convert.c                      |  164 ++++++++++++++++++++++++++++++++++
 tests/meson.build                    |    5 +
 4 files changed, 173 insertions(+), 0 deletions(-)
---
diff --git a/tests/convert-data/convert1.expected b/tests/convert-data/convert1.expected
new file mode 100644
index 0000000..4424b64
--- /dev/null
+++ b/tests/convert-data/convert1.expected
@@ -0,0 +1,3 @@
+INPUT '20 tsp'
+RESULT '6.66667 tbsp'
+
diff --git a/tests/convert-data/convert1.in b/tests/convert-data/convert1.in
new file mode 100644
index 0000000..b0e5373
--- /dev/null
+++ b/tests/convert-data/convert1.in
@@ -0,0 +1 @@
+20 tsp
diff --git a/tests/convert.c b/tests/convert.c
new file mode 100644
index 0000000..96bbd44
--- /dev/null
+++ b/tests/convert.c
@@ -0,0 +1,164 @@
+/* convert.c
+ *
+ * Copyright (C) 2017 Matthias Clasen <mclasen redhat com#}#>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more &details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include <locale.h>
+#include <stdio.h>
+#include <glib.h>
+#include "gr-unit.h"
+#include "gr-unit.c"
+#include "gr-convert-units.h"
+#include "gr-convert-units.c"
+#include "gr-utils.h"
+#include "gr-utils.c"
+#include "gr-settings.h"
+#include "gr-settings.c"
+
+static GString *string;
+
+static void
+test_line (const char *line)
+{
+        char *input;
+        g_autoptr(GError) error = NULL;
+        g_auto(GStrv) strv = NULL;
+        char *endptr;
+        double amount;
+        char *unit;
+
+        g_string_append_printf (string, "INPUT '%s'\n", line);
+
+        input = (char *)line;
+        amount = g_ascii_strtod (input, &endptr);
+        if (endptr[0] != ' ') {
+                g_string_append_printf (string, "ERROR invalid amount\n");
+                return;
+        }
+        while (endptr[0] == ' ') endptr++;
+        unit = endptr;
+        if (gr_unit_get_id_number (unit) == 0) {
+                g_string_append_printf (string, "ERROR invalid unit\n");
+                return;
+        }
+
+        human_readable (&amount, &unit);
+
+        g_string_append_printf (string, "RESULT '%g %s'\n", amount, unit);
+
+        g_string_append (string, "\n");
+}
+
+static void
+test_file (const char *filename)
+{
+        g_autofree char *contents = NULL;
+        gsize length;
+        g_autoptr(GError) error = NULL;
+        g_auto(GStrv) lines = NULL;
+        int i;
+
+        if (!g_file_get_contents (filename, &contents, &length, &error)) {
+                fprintf (stderr, "%s\n", error->message);
+                return;
+        }
+
+        lines = g_strsplit (contents, "\n", -1);
+        for (i = 0; lines[i]; i++) {
+                if (lines[i][0] != 0 && lines[i][0] != '#')
+                        test_line (lines[i]);
+        }
+}
+
+static char *
+get_expected_filename (const char *filename)
+{
+        char *f, *p, *expected;
+
+        f = g_strdup (filename);
+        p = strstr (f, ".in");
+        if (p)
+                *p = 0;
+        expected = g_strconcat (f, ".expected", NULL);
+
+        g_free (f);
+
+        return expected;
+}
+
+static void
+test_parse (gconstpointer d)
+{
+        const char *filename = d;
+        char *expected_file;
+        char *expected;
+        GError *error = NULL;
+
+        expected_file = get_expected_filename (filename);
+
+        string = g_string_sized_new (0);
+
+        test_file (filename);
+
+        g_file_get_contents (expected_file, &expected, NULL, &error);
+        g_assert_no_error (error);
+        g_assert_cmpstr (string->str, ==, expected);
+        g_free (expected);
+
+        g_string_free (string, TRUE);
+
+        g_free (expected_file);
+}
+
+int main (int argc, char *argv[])
+{
+        GDir *dir;
+        GError *error;
+        const char *name;
+        char *path;
+
+        g_setenv ("LC_ALL", "en_US.UTF-8", TRUE);
+        setlocale (LC_ALL, "");
+
+        g_test_init (&argc, &argv, NULL);
+
+        /* allow to easily generate expected output for new test cases */
+        if (argc > 1) {
+                string = g_string_sized_new (0);
+                test_file (argv[1]);
+                g_print ("%s", string->str);
+                return 0;
+        }
+
+        error = NULL;
+        path = g_test_build_filename (G_TEST_DIST, "convert-data", NULL);
+        dir = g_dir_open (path, 0, &error);
+        g_free (path);
+        g_assert_no_error (error);
+        while ((name = g_dir_read_name (dir)) != NULL) {
+                if (!g_str_has_suffix (name, ".in"))
+                        continue;
+
+                path = g_strdup_printf ("/unit/convert/%s", name);
+                g_test_add_data_func_full (path, g_test_build_filename (G_TEST_DIST, "convert-data", name, 
NULL),
+                                           test_parse, g_free);
+                g_free (path);
+        }
+        g_dir_close (dir);
+
+  return g_test_run ();
+}
diff --git a/tests/meson.build b/tests/meson.build
index e278ea6..0a9639a 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -31,3 +31,8 @@ strv = executable('strv', 'strv.c',
                   include_directories : tests_inc,
                   dependencies: deps)
 test('strv', strv, env : env)
+
+convert = executable('convert', 'convert.c',
+                  include_directories : tests_inc,
+                  dependencies: deps)
+test('convert', convert, env : env)