testing

diff --git a/appveyor.yml b/appveyor.yml
index 06d4a48..1b99b75 100644
--- a/appveyor.yml
+++ b/appveyor.yml

@@ -6,7 +6,7 @@
     - PYTHON: "C:\\Python37-x64"
       PYTHON_VERSION: "3.7.x"
       PYTHON_ARCH: "64"
-      EXTRA_ARGS:
+      EXTRA_ARGS: "-- -k testIncrementalCompilation"
     - PYTHON: "C:\\Python37"
       PYTHON_VERSION: "3.7.x"
       PYTHON_ARCH: "32"

diff --git a/mypyc/test/test_run.py b/mypyc/test/test_run.py
index c88aeac..bdd1145 100644
--- a/mypyc/test/test_run.py
+++ b/mypyc/test/test_run.py

@@ -163,6 +163,7 @@
         options.export_types = True
         options.preserve_asts = True
         options.incremental = self.separate
+        options.verbosity = 1
 
         # Avoid checking modules/packages named 'unchecked', to provide a way
         # to test interacting with code we don't have types for.
@@ -203,7 +204,8 @@
                 groups=groups,
                 alt_lib_path='.')
             errors = Errors()
-            compiler_options = CompilerOptions(multi_file=self.multi_file, separate=self.separate)
+            compiler_options = CompilerOptions(multi_file=self.multi_file, separate=self.separate,
+                                               verbose=True)
             ir, cfiles = emitmodule.compile_modules_to_c(
                 result,
                 compiler_options=compiler_options,
@@ -262,6 +264,7 @@
         if proc.returncode != 0:
             print()
             print('*** Exit status: %d' % proc.returncode)
+            print('*** Output:\n' + output)
 
         # Verify output.
         if bench: