Add test

Author: wismill

cabal-testsuite/PackageTests/ReplBuildDepends/Foo.hs

@@ -0,0 +1,4 @@
+module Foo where
+
+a :: Int
+a = 42

cabal-testsuite/PackageTests/ReplBuildDepends/cabal.allow-newer.out

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+# cabal clean
+# cabal repl

cabal-testsuite/PackageTests/ReplBuildDepends/cabal.allow-older.out

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+# cabal clean
+# cabal repl

cabal-testsuite/PackageTests/ReplBuildDepends/cabal.normal.out

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+# cabal clean
+# cabal repl

cabal-testsuite/PackageTests/ReplBuildDepends/cabal.project

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+packages: .

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

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+import Test.Cabal.Prelude
+
+-- Test “repl --build-depends”
+main = do
+  let imports = "import qualified Data.ByteString as BS"
+  cabalTest' "normal" $ do
+    cabal' "clean" []
+    res <- cabalWithStdin 
+        "repl" 
+        ["-v2", "--build-depends", "bytestring"] 
+        imports
+    assertOutputContains "Ok, one module loaded." res
+    -- Ensure we can load ‘bytestring’
+    assertOutputDoesNotContain "Could not load" res
+  cabalTest' "allow-newer" $ do
+    cabal' "clean" []
+    res <- cabalWithStdin
+        "repl" 
+        ["-v2", "--build-depends", "bytestring", "--allow-newer"] 
+        imports
+    assertOutputContains "Ok, one module loaded." res
+    -- Ensure we can load ‘bytestring’
+    -- See https://github.com/haskell/cabal/issues/6859
+    assertOutputDoesNotContain "Could not load" res
+  cabalTest' "allow-older" $ do
+    cabal' "clean" []
+    res <- cabalWithStdin
+        "repl" 
+        ["-v2", "--build-depends", "bytestring", "--allow-older"] 
+        imports
+    assertOutputContains "Ok, one module loaded." res
+    -- Ensure we can load ‘bytestring’
+    -- See https://github.com/haskell/cabal/issues/6859
+    assertOutputDoesNotContain "Could not load" res
+

cabal-testsuite/PackageTests/ReplBuildDepends/pkg.cabal

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+cabal-version:      2.4
+name:               pkg
+version:            0.1.0.0
+library
+    exposed-modules:  Foo
+    build-depends:    base
+    default-language: Haskell2010