我正在尝试在Haskell中进行一些单元测试,这基本上就是我在代码中所做的:
module Test where
import Test.HUnit
test = TestList [TestLabel "running all the tests!"
$ TestList [
. . . . .
]]
run = runTestTT tests
当我尝试使用gchi编译它时,我收到此消息:
Could not find module ‘Test.HUnit’
Use -v to see a list of the files searched for.
Failed, modules loaded: none
如何让HUnit工作?
我正在使用GHCi版本7.8.3
由于
我尝试通过cabal安装HUnit作为建议的答案,但后来我收到了错误:
Could not find module ‘Test.HUnit’ Perhaps you haven't installed the "dyn" libraries for
package ‘HUnit-1.2.5.2’?
Use -v to see a list of the files searched for.
然后我使用了命令:
cabal install base
我收到了这条消息:
Resolving dependencies...
All the requested packages are already installed:
base-4.7.0.1
Use --reinstall if you want to reinstall anyway.
所以我使用了命令:
cabal install base -reinstall
重新安装以防万一,我收到了消息:
Resolving dependencies...
cabal: Could not resolve dependencies:
rejecting: base-4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0, 4.5.0.0, 4.4.1.0,
4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0, 4.1.0.0, 4.0.0.0 (only
already installed instances can be used)
rejecting: base-3.0.3.2 (conflict: base => base>=4.0 && <4.3)
rejecting: base-3.0.3.1 (conflict: base => base>=4.0 && <4.2)
我该怎么办?
答案 0 :(得分:1)
原来我错误地安装了两个版本的ghc(7.6.3和7.8.3),所以我将它们与cabal一起移除并重新安装了所有东西。现在它有效!