Chapter 14: Play with Hspec and QuickCheck

Author: dwayne

ch14/addition/.gitignore

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+.stack-work/

ch14/addition/Addition.hs

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+module Addition where
+
+-- import Test.Hspec
+import Test.QuickCheck
+
+-- dividedBy :: Integral a => a -> a -> (a, a)
+-- dividedBy num denom = go num denom 0
+--   where go n d count
+--           | n < d = (count, n)
+--           | otherwise = go (n - d) d (count + 1)
+--
+-- main :: IO ()
+-- main = hspec $ do
+--   describe "Addition" $ do
+--     it "15 divided by 3 is 5" $ do
+--       dividedBy 15 3 `shouldBe` (5, 0)
+--     it "22 divided by 5 is 4 remainder 2" $ do
+--       dividedBy 22 5 `shouldBe` (4, 2)
+
+-- main :: IO ()
+-- main = hspec $ do
+--   describe "Addition" $ do
+--     it "1 + 1 is greater than 1" $ do
+--       (1 + 1) > 1 `shouldBe` True
+--     it "2 + 2 is equal to 4" $ do
+--       2 + 2 `shouldBe` 4
+--     it "x + 1 is always greater than x" $ do
+--       property $ \x -> x + 1 > (x :: Int)
+
+-- choose :: System.Random.Random a => (a, a) -> Gen a
+-- elements :: [a] -> Gen a
+
+-- genBool :: Gen Bool
+-- genBool = choose (False, True)
+--
+-- genBool' :: Gen Bool
+-- genBool' = elements [False, True]
+--
+-- genOrdering :: Gen Ordering
+-- genOrdering = elements [LT, EQ, GT]
+--
+-- genChar :: Gen Char
+-- genChar = elements ['a'..'z']
+
+prop_additionGreater :: Int -> Bool
+prop_additionGreater x = x + 1 > x
+
+runQc :: IO ()
+runQc = quickCheck prop_additionGreater

ch14/addition/LICENSE

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+Copyright Author name here (c) 2016
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Author name here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

ch14/addition/Setup.hs

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+import Distribution.Simple
+main = defaultMain

ch14/addition/addition.cabal

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+name:                addition
+version:             0.1.0.0
+synopsis:            Simple project template from stack
+description:         Please see README.md
+homepage:            https://github.com/githubuser/addition#readme
+license:             BSD3
+license-file:        LICENSE
+author:              Author name here
+maintainer:          example@example.com
+copyright:           2016 Author name here
+category:            Text
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:     .
+  exposed-modules:    Addition
+  ghc-options:        -Wall -fwarn-tabs
+  default-language:   Haskell2010
+  build-depends:      base >=4.7 && <5
+                    , hspec
+                    , QuickCheck

ch14/addition/stack.yaml

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+# This file was automatically generated by 'stack init'
+# 
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# http://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+# 
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+# resolver:
+#  name: custom-snapshot
+#  location: "./custom-snapshot.yaml"
+resolver: lts-5.15
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+# 
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#   extra-dep: true
+#  subdirs:
+#  - auto-update
+#  - wai
+# 
+# A package marked 'extra-dep: true' will only be built if demanded by a
+# non-dependency (i.e. a user package), and its test suites and benchmarks
+# will not be run. This is useful for tweaking upstream packages.
+packages:
+- '.'
+# Dependency packages to be pulled from upstream that are not in the resolver
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+flags: {}
+
+# Extra package databases containing global packages
+extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+# 
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.1"
+# 
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+# 
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+# 
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor