tests: online::clone: inline creds-test with nonexistent URL

Right now, we test our credential callback code twice, once via SSH on
localhost and once via a non-existent GitHub repository. While the first
URL makes sense to be configurable, it does not make sense to hard-code
the non-existing repository, which requires us to call tests multiple
times. Instead, we can just inline the URL into another set of tests.

(cherry picked from commit 54a1bf05)

CMakeLists.txt

@@ -711,7 +711,6 @@ IF (BUILD_CLAR)
 
 	# Add a test target which runs the cred callback tests, to be
 	# called after setting the url and user
-	ADD_TEST(libgit2_clar-cred_callback libgit2_clar -v -sonline::clone::cred_callback)
 	ADD_TEST(libgit2_clar-proxy_credentials libgit2_clar -v -sonline::clone::proxy_credentials_in_url -sonline::clone::proxy_credentials_request)
 
 ENDIF ()

appveyor.yml

@@ -38,9 +38,6 @@ test_script:
     # Run this early so we know it's ready by the time we need it
     $proxyJob = Start-Job { java -jar $Env:APPVEYOR_BUILD_FOLDER\build\poxyproxy.jar -d --port 8080 --credentials foo:bar }
     ctest -V -R libgit2_clar
-    $env:GITTEST_REMOTE_URL="https://github.com/libgit2/non-existent"
-    $env:GITTEST_REMOTE_USER="libgit2test"
-    ctest -V -R libgit2_clar-cred_callback
     Receive-Job -Job $proxyJob
     $env:GITTEST_REMOTE_PROXY_URL = "localhost:8080"
     $env:GITTEST_REMOTE_PROXY_USER = "foo"

script/cibuild.sh

@@ -98,15 +98,8 @@ export GITTEST_REMOTE_PROXY_PASS="bar"
 if [ -e ./libgit2_clar ]; then
     ./libgit2_clar -sonline::push -sonline::clone::ssh_cert &&
     ./libgit2_clar -sonline::clone::ssh_with_paths || exit $?
-    if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-        ./libgit2_clar -sonline::clone::cred_callback || exit $?
-    fi
 
     ctest -V -R libgit2_clar-proxy_credentials || exit $?
 fi
 
 kill $(cat "$HOME/sshd/pid")
-
-export GITTEST_REMOTE_URL="https://github.com/libgit2/non-existent"
-export GITTEST_REMOTE_USER="libgit2test"
-ctest -V -R libgit2_clar-cred_callback

tests/online/clone.c

@@ -263,8 +263,8 @@ static int cred_failure_cb(
 
 void test_online_clone__cred_callback_failure_return_code_is_tunnelled(void)
 {
-	if (!_remote_url || !_remote_user)
-		clar__skip();
+	_remote_url = git__strdup("https://github.com/libgit2/non-existent");
+	_remote_user = git__strdup("libgit2test");
 
 	g_options.fetch_opts.callbacks.credentials = cred_failure_cb;
 
@@ -293,8 +293,8 @@ void test_online_clone__cred_callback_called_again_on_auth_failure(void)
 {
 	size_t counter = 0;
 
-	if (!_remote_url || !_remote_user)
-		clar__skip();
+	_remote_url = git__strdup("https://github.com/libgit2/non-existent");
+	_remote_user = git__strdup("libgit2test");
 
 	g_options.fetch_opts.callbacks.credentials = cred_count_calls_cb;
 	g_options.fetch_opts.callbacks.payload = &counter;