Write the code used by all tests

2 files changed, 31 insertions, 2 deletions

diff --git a/src/scm/webid-oidc/Makefile.am b/src/scm/webid-oidc/Makefile.am
index 8872758..e74b26c 100644
--- a/src/scm/webid-oidc/Makefile.am
+++ b/src/scm/webid-oidc/Makefile.am
@@ -1,7 +1,9 @@
 dist_webidoidcmod_DATA += \
   %reldir%/errors.scm \
-  %reldir%/stubs.scm
+  %reldir%/stubs.scm \
+  %reldir%/testing.scm
 
 webidoidcgo_DATA += \
   %reldir%/errors.go \
-  %reldir%/stubs.go
+  %reldir%/stubs.go \
+  %reldir%/testing.go
diff --git a/src/scm/webid-oidc/testing.scm b/src/scm/webid-oidc/testing.scm
new file mode 100644
index 0000000..40284cf
--- /dev/null
+++ b/src/scm/webid-oidc/testing.scm
@@ -0,0 +1,27 @@
+(define-module (webid-oidc testing)
+  #:use-module (webid-oidc stubs)
+  #:use-module (webid-oidc errors))
+
+;; This module is used only when running tests.
+
+(define-public (with-test-environment test-name f)
+  (let ((cache-dir (format #f "tests/~a.cache" test-name)))
+    (setenv "XDG_CACHE_HOME" cache-dir)
+    (catch #t
+      (lambda () (mkdir cache-dir))
+      (lambda err #t))
+    (let ((pkg-cache-dir (format #f "~a/webid-oidc" cache-dir)))
+      (catch #t
+        (lambda () (mkdir pkg-cache-dir))
+        (lambda err #t))
+      (let ((seed-file-name (format #f "~a/seed" pkg-cache-dir)))
+        (with-output-to-file seed-file-name
+          (lambda ()
+            (format #t "This is the initial seed for the random number generator"))))))
+  (with-exception-handler
+      (lambda (error)
+        (format (current-error-port) "The test failed, because ~a.\n"
+                (error->str error))
+        (raise-exception error))
+    (lambda ()
+      (f))))