Do not run inspection tests in developer mode

tests/Tests.hs

@@ -1,5 +1,5 @@
--- | Provides a simple main function which runs all the tests
---
+{-# LANGUAGE CPP #-}
+
 module Main
     ( main
     ) where
@@ -10,14 +10,18 @@ import qualified Tests.Lift as Lift
 import qualified Tests.Properties as Properties
 import qualified Tests.Regressions as Regressions
 
+#if !defined(ASSERTS)
 import qualified Tests.Inspection.Strict as InspectionStrict
 import qualified Tests.Inspection.Lazy   as InspectionLazy
+#endif
 
 main :: IO ()
 main = defaultMain $ testGroup "All"
   [ Lift.tests
   , Properties.tests
   , Regressions.tests
+#if !defined(ASSERTS)
   , InspectionStrict.tests
   , InspectionLazy.tests
+#endif
   ]

text.cabal

@@ -181,8 +181,6 @@ test-suite tests
   hs-source-dirs: tests
   main-is:        Tests.hs
   other-modules:
-    Tests.Inspection.Lazy
-    Tests.Inspection.Strict
     Tests.Lift
     Tests.Properties
     Tests.Properties.Basics
@@ -199,6 +197,15 @@ test-suite tests
     Tests.SlowFunctions
     Tests.Utils
 
+  -- Fusion tests fail in developer mode (because asserts break inlining)
+  -- and take ages to build.
+  if flag(developer)
+    cpp-options: -DASSERTS
+  else
+    other-modules:
+      Tests.Inspection.Lazy
+      Tests.Inspection.Strict
+
   build-depends:
     QuickCheck >= 2.14.1 && < 2.15,
     base <5,