The matrix will be slightly prettier this way <_< >_>

appveyor.yml

@@ -23,9 +23,7 @@ environment:
 
   matrix:
   - TASK: test
-    BUILD_ARG:
   - TASK: installer
-    BUILD_ARG: --create-windows-installer
 
 matrix:
   fast_finish: true
@@ -38,6 +36,12 @@ install:
 
 build_script:
   - CD %APPVEYOR_BUILD_FOLDER%
+  - |
+    IF [%TASK%]==[installer] (
+      SET BUILD_ARG=--create-windows-installer
+    ) ELSE (
+      SET BUILD_ARG=
+    )
   - script\build.cmd --code-sign --compress-artifacts %BUILD_ARG%
 
 test_script: