Add tests

cabal-testsuite/PackageTests/ReplProjectTarget/cabal.out

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+# checking repl command with a project using an implicit default 'cabal.project'
+# cabal repl
+Configuration is affected by the following files:
+- cabal.project
+Error: [Cabal-7076]
+With a project, the REPL command requires a single target. The packages in this project are:
+ - pkg-one
+ - pkg-two
+# checking repl command with a project using an explicit 'cabal.project'
+# cabal repl
+Configuration is affected by the following files:
+- some.project
+Error: [Cabal-7076]
+With a project, the REPL command requires a single target. The packages in this project, 'some.project', are:
+ - pkg-one
+ - pkg-two
+# checking repl command with a project listing packages in reverse order
+# cabal repl
+Configuration is affected by the following files:
+- reverse.project
+Error: [Cabal-7076]
+With a project, the REPL command requires a single target. The packages in this project, 'reverse.project', are:
+ - pkg-one
+ - pkg-two
+# checking repl command with a project with no packages
+# cabal repl
+Configuration is affected by the following files:
+- empty.project
+Warning: There are no packages or optional-packages in the project
+Error: [Cabal-7076]
+With a project, the REPL command requires a single target but there are no packages in this project, 'empty.project', to choose a package (library) or other component from as the target for this command.
+# checking repl command with a missing project
+# cabal repl

cabal-testsuite/PackageTests/ReplProjectTarget/cabal.project

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+packages: pkg-one pkg-two

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

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+import Test.Cabal.Prelude
+
+main = cabalTest . recordMode RecordMarked $ do
+  let log = recordHeader . pure
+
+  log "checking repl command with a project using an implicit default 'cabal.project'"
+  _ <- fails $ cabal' "repl" []
+
+  log "checking repl command with a project using an explicit 'cabal.project'"
+  _ <- fails $ cabal' "repl" [ "--project-file=some.project" ]
+
+  log "checking repl command with a project listing packages in reverse order"
+  _ <- fails $ cabal' "repl" [ "--project-file=reverse.project" ]
+
+  log "checking repl command with a project with no packages"
+  _ <- fails $ cabal' "repl" [ "--project-file=empty.project" ]
+
+  log "checking repl command with a missing project"
+  missing <- fails $ cabal' "repl" [ "--project-file=missing.project" ]
+  assertOutputContains "The given project file 'missing.project' does not exist." missing
+
+  return ()

cabal-testsuite/PackageTests/ReplProjectTarget/pkg-one/pkg-one.cabal

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+name:           pkg-one
+version:        0.1
+license:        BSD3
+cabal-version:  >= 1.2
+build-type:     Simple
+
+library
+    exposed-modules:    Foo
+    build-depends:      base

cabal-testsuite/PackageTests/ReplProjectTarget/pkg-two/pkg-one.cabal

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+name:           pkg-one
+version:        0.1
+license:        BSD3
+cabal-version:  >= 1.2
+build-type:     Simple
+
+library
+    exposed-modules:    Foo
+    build-depends:      base

cabal-testsuite/PackageTests/ReplProjectTarget/reverse.project

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+packages: pkg-two pkg-one

cabal-testsuite/PackageTests/ReplProjectTarget/some.project

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+packages: pkg-one pkg-two