Add Y-forking import test

- A test for detecting when the same config is imported via many different paths

.

Author: philderbeast

cabal-testsuite/PackageTests/ConditionalAndImport/cabal.out

@@ -124,6 +124,9 @@ Could not resolve dependencies:
       (constraint from oops-0.project requires ==1.4.3.0)
 [__1] fail (backjumping, conflict set: hashable, oops)
 After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: hashable (3), oops (2)
+# checking that we detect when the same config is imported via many different paths
+# cabal v2-build
+Up to date
 # checking bad conditional
 # cabal v2-build
 Error: [Cabal-7090]

cabal-testsuite/PackageTests/ConditionalAndImport/cabal.test.hs

@@ -222,6 +222,36 @@ main = cabalTest . withRepo "repo" . recordMode RecordMarked $ do
     \        imported by: oops-0.project"
     oopsing
 
+  -- The project is named yops as it is like hops but with y's for forks.
+  -- +-- yops-0.project
+  --  +-- yops/yops-1.config
+  --   +-- yops-2.config
+  --    +-- yops/yops-3.config
+  --     +-- yops-4.config
+  --      +-- yops/yops-5.config
+  --       +-- yops-6.config
+  --        +-- yops/yops-7.config
+  --         +-- yops-8.config
+  --          +-- yops/yops-9.config (no further imports)
+  --  +-- yops/yops-3.config
+  --   +-- yops-4.config
+  --    +-- yops/yops-5.config
+  --     +-- yops-6.config
+  --      +-- yops/yops-7.config
+  --       +-- yops-8.config
+  --        +-- yops/yops-9.config (no further imports)
+  --  +-- yops/yops-5.config
+  --   +-- yops-6.config
+  --    +-- yops/yops-7.config
+  --     +-- yops-8.config
+  --      +-- yops/yops-9.config (no further imports)
+  --  +-- yops/yops-7.config
+  --   +-- yops-8.config
+  --    +-- yops/yops-9.config (no further imports)
+  --  +-- yops/yops-9.config (no further imports)
+  log "checking that we detect when the same config is imported via many different paths"
+  hopping <- fails $ cabal' "v2-build" [ "--project-file=yops-0.project" ]
+
   log "checking bad conditional"
   badIf <- fails $ cabal' "v2-build" [ "--project-file=bad-conditional.project" ]
   assertOutputContains "Cannot set compiler in a conditional clause of a cabal project file" badIf

cabal-testsuite/PackageTests/ConditionalAndImport/yops-0.project

@@ -0,0 +1,7 @@
+packages: .
+
+import: yops/yops-1.config
+import: yops/yops-3.config
+import: yops/yops-5.config
+import: yops/yops-7.config
+import: yops/yops-9.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops-2.config

@@ -0,0 +1 @@
+import: yops/yops-3.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops-4.config

@@ -0,0 +1 @@
+import: yops/yops-5.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops-6.config

@@ -0,0 +1 @@
+import: yops/yops-7.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops-8.config

@@ -0,0 +1 @@
+import: yops/yops-9.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops/yops-1.config

@@ -0,0 +1 @@
+import: ../yops-2.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops/yops-3.config

@@ -0,0 +1 @@
+import: ../yops-4.config

cabal-testsuite/PackageTests/ConditionalAndImport/yops/yops-5.config

@@ -0,0 +1 @@
+import: ../yops-6.config