diff --git a/src/calamares/testmain.cpp b/src/calamares/testmain.cpp
index 195701024..982a9b4c2 100644
--- a/src/calamares/testmain.cpp
+++ b/src/calamares/testmain.cpp
@@ -227,7 +227,8 @@ main( int argc, char* argv[] )
             cError() << "Job #" << count << "failed"
                 << TR( "summary", r.message() )
                 << TR( "details", r.details() );
-            ++failure_count;
+            if ( r.errorCode() > 0 )
+                ++failure_count;
         }
         ++count;
     }
diff --git a/src/libcalamares/Job.cpp b/src/libcalamares/Job.cpp
index ded0aecc3..d2118451f 100644
--- a/src/libcalamares/Job.cpp
+++ b/src/libcalamares/Job.cpp
@@ -71,7 +71,7 @@ JobResult::ok()
 JobResult
 JobResult::error( const QString& message, const QString& details )
 {
-    return JobResult( message, details, -1 );
+    return JobResult( message, details, GenericError );
 }
 
 JobResult
diff --git a/src/libcalamares/Job.h b/src/libcalamares/Job.h
index eb685ff81..04b4560a4 100644
--- a/src/libcalamares/Job.h
+++ b/src/libcalamares/Job.h
@@ -29,6 +29,13 @@ namespace Calamares {
 class DLLEXPORT JobResult
 {
 public:
+    /** @brief Distinguish classes of errors
+     *
+     * All "ok result" have errorCode 0 (NoError).
+     * Errors returned from job execution have values < 0.
+     * Errors before job execution, or not returned by the job execution
+     * itself, have values > 0.
+     */
     enum
     {
         NoError = 0,
@@ -49,6 +56,8 @@ public:
     virtual QString details() const;
     virtual void setDetails( const QString& details );
 
+    int errorCode() const { return m_number; }
+
     /// @brief an "ok status" result
     static JobResult ok();
     /// @brief an "error" result resulting from the execution of the job