Unit tests (#12)

* Change return value of conda_setup_headless() from void to int

* Replace exit() with return;

* Return early if unpacking the micromamba binary fails

* Exit program when pointer to INIFILE is NULL.

* Validation function cannot otherwise proceed

* The way the logic is set up I've decided to duplicate the installation code for now until I find time to revise it

* The only meaningful difference between a "fresh start" and reusing the conda installation is a rmtree().

* Exposes STASIS_DOWNLOAD_TIMEOUT environment variable

* Sets the connection timeout for libcurl to 30, instead of 300.

* Export ini_section_create() function

* Add download() tests

* Add conda_*() tests

* Add boilerplate source file for test framework

* Fixes segfault reported by @GeorgeJCleary (#10)

* The key is now an array index. When key is -1, the env variable is not defined.

* Free resources only when continue on error is disabled (#11)

* Fix segfault due to premature shutdown/cleanup

* If conda_setup_headless cannot succeed, die

* Set STASIS_SYSCONFDIR for tests

1 files changed, 50 insertions, 0 deletions

diff --git a/tests/test_download.c b/tests/test_download.c
new file mode 100644
index 0000000..cee7683
--- /dev/null
+++ b/tests/test_download.c
@@ -0,0 +1,50 @@
+#include "testing.h"
+
+void test_download() {
+    struct testcase {
+        const char *url;
+        long http_code;
+        const char *data;
+        const char *errmsg;
+    };
+    struct testcase tc[] = {
+            {.url = "https://ssb.stsci.edu/jhunk/stasis_test/test_download.txt", .http_code = 200L, .data = "It works!\n", .errmsg = NULL},
+            {.url = "https://ssb.stsci.edu/jhunk/stasis_test/test_download.broken", .http_code = 404L, .data = "<html", .errmsg = NULL},
+            {.url = "https://example.tld", .http_code = -1L, .data = NULL, .errmsg = "Couldn't resolve host name"},
+    };
+
+    for (size_t i = 0; i < sizeof(tc) / sizeof(*tc); i++) {
+        const char *filename = "output.txt";
+        char errmsg[BUFSIZ] = {0};
+        char *errmsg_p = errmsg;
+        long http_code = download((char *) tc[i].url, filename, &errmsg_p);
+        if (tc[i].errmsg) {
+            STASIS_ASSERT(strlen(errmsg_p), "an error should have been thrown by curl, but wasn't");
+            fflush(stderr);
+            SYSERROR("curl error message: %s", errmsg_p);
+        } else {
+            STASIS_ASSERT(!strlen(errmsg_p), "unexpected error thrown by curl");
+        }
+        STASIS_ASSERT(http_code == tc[i].http_code, "expecting non-error HTTP code");
+
+        char **data = file_readlines(filename, 0, 100, NULL);
+        if (http_code >= 0) {
+            STASIS_ASSERT(data != NULL, "data should not be null");
+            STASIS_ASSERT(strncmp(data[0], tc[i].data, strlen(tc[i].data)) == 0, "data file does not match the expected contents");
+        } else {
+            STASIS_ASSERT(http_code == -1, "http_code should be -1 on fatal curl error");
+            STASIS_ASSERT(data == NULL, "data should be NULL on fatal curl error");
+        }
+        guard_free(data);
+        remove(filename);
+    }
+}
+
+int main(int argc, char *argv[]) {
+    STASIS_TEST_BEGIN_MAIN();
+    STASIS_TEST_FUNC *tests[] = {
+            test_download,
+    };
+    STASIS_TEST_RUN(tests);
+    STASIS_TEST_END_MAIN();
+}
\ No newline at end of file