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| 1 | +{-# LANGUAGE QuasiQuotes #-} |
| 2 | + |
| 3 | +{- |
| 4 | +
|
| 5 | +Testing strategies: |
| 6 | +
|
| 7 | +fromString . toString == id ** Todo? |
| 8 | +
|
| 9 | +toString . fromString == almost id ** Todo? |
| 10 | +
|
| 11 | +postgresql -> haskell -> postgresql * Done |
| 12 | +
|
| 13 | +haskell -> postgresql -> haskell ** Todo? |
| 14 | +
|
| 15 | +But still, what we really want to establish is that the two values |
| 16 | +correspond; for example, a conversion that consistently added hour |
| 17 | +when printed to a string and subtracted an hour when parsed from string |
| 18 | +would still pass these tests. |
| 19 | +
|
| 20 | +
|
| 21 | +Right now, we are checking that 1400+ timestamps in the range of 1860 to |
| 22 | +2060 round trip from postgresql to haskell and back in 5 different timezones. |
| 23 | +In addition to UTC, the four timezones were selected so that 2 have a positive |
| 24 | +offset, and 2 have a negative offset, and that 2 have an offset of a |
| 25 | +whole number of hours, while the other two do not. |
| 26 | +
|
| 27 | +It may be worth adding a few more timezones to ensure better test coverage. |
| 28 | +
|
| 29 | +We are checking a handful of selected timestamps to ensure we hit |
| 30 | +various corner-cases in the code, in addition to 1400 timestamps randomly |
| 31 | +generated with granularity of seconds down to microseconds in powers of ten. |
| 32 | +
|
| 33 | +-} |
| 34 | + |
| 35 | +module Interval (testInterval) where |
| 36 | + |
| 37 | +import Common |
| 38 | +import Control.Monad(forM_, replicateM_) |
| 39 | +import Data.Time.Compat |
| 40 | +import Data.Time.LocalTime.Compat (CalendarDiffTime(..)) |
| 41 | +import Data.ByteString(ByteString) |
| 42 | +import Database.PostgreSQL.Simple.SqlQQ |
| 43 | + |
| 44 | +data IntervalTestCase = IntervalTestCase |
| 45 | + { label :: String |
| 46 | + , inputMonths :: Integer |
| 47 | + , inputSeconds :: NominalDiffTime |
| 48 | + , asText :: String |
| 49 | + } |
| 50 | + deriving (Eq, Show) |
| 51 | + |
| 52 | +testInterval :: TestEnv -> Assertion |
| 53 | +testInterval env@TestEnv{..} = do |
| 54 | + |
| 55 | + initializeTable env |
| 56 | + |
| 57 | + let milliseconds = 0.001 |
| 58 | + seconds = 1 |
| 59 | + minutes = 60 * seconds |
| 60 | + hours = 60 * minutes |
| 61 | + days = 24 * hours |
| 62 | + weeks = 7 * days |
| 63 | + months = 1 |
| 64 | + years = 12 * months |
| 65 | + |
| 66 | + mapM (checkRoundTrip env) |
| 67 | + [ IntervalTestCase |
| 68 | + { label = "zero" |
| 69 | + , inputMonths = 0 |
| 70 | + , inputSeconds = 0 |
| 71 | + , asText = "PT0" |
| 72 | + } |
| 73 | + , IntervalTestCase |
| 74 | + { label = "1 year" |
| 75 | + , inputMonths = 1 * years |
| 76 | + , inputSeconds = 0 |
| 77 | + , asText = "P1Y" |
| 78 | + } |
| 79 | + , IntervalTestCase |
| 80 | + { label = "2 months" |
| 81 | + , inputMonths = 2 * months |
| 82 | + , inputSeconds = 0 |
| 83 | + , asText = "P2M" |
| 84 | + } |
| 85 | + , IntervalTestCase |
| 86 | + { label = "3 weeks" |
| 87 | + , inputMonths = 0 |
| 88 | + , inputSeconds = 3 * weeks |
| 89 | + , asText = "P3W" |
| 90 | + } |
| 91 | + , IntervalTestCase |
| 92 | + { label = "4 days" |
| 93 | + , inputMonths = 0 |
| 94 | + , inputSeconds = 4 * days |
| 95 | + , asText = "P4D" |
| 96 | + } |
| 97 | + , IntervalTestCase |
| 98 | + { label = "5 hours" |
| 99 | + , inputMonths = 0 |
| 100 | + , inputSeconds = 5 * hours |
| 101 | + , asText = "PT5H" |
| 102 | + } |
| 103 | + , IntervalTestCase |
| 104 | + { label = "6 minutes" |
| 105 | + , inputMonths = 0 |
| 106 | + , inputSeconds = 6 * minutes |
| 107 | + , asText = "PT6M" |
| 108 | + } |
| 109 | + , IntervalTestCase |
| 110 | + { label = "7 seconds" |
| 111 | + , inputMonths = 0 |
| 112 | + , inputSeconds = 7 * seconds |
| 113 | + , asText = "PT7S" |
| 114 | + } |
| 115 | + , IntervalTestCase |
| 116 | + { label = "8 milliseconds" |
| 117 | + , inputMonths = 0 |
| 118 | + , inputSeconds = 8 * milliseconds |
| 119 | + , asText = "PT0.008S" |
| 120 | + } |
| 121 | + , IntervalTestCase |
| 122 | + { label = "combination of intervals (day-size or bigger)" |
| 123 | + , inputMonths = 2 * years + 4 * months |
| 124 | + , inputSeconds = 3 * weeks + 5 * days |
| 125 | + , asText = "P2Y4M3W5D" |
| 126 | + } |
| 127 | + , IntervalTestCase |
| 128 | + { label = "combination of intervals (smaller than day-size)" |
| 129 | + , inputMonths = 0 |
| 130 | + , inputSeconds = 18 * hours + 56 * minutes + 23 * seconds + 563 * milliseconds |
| 131 | + , asText = "PT18H56M23.563S" |
| 132 | + } |
| 133 | + , IntervalTestCase |
| 134 | + { label = "full combination of intervals" |
| 135 | + , inputMonths = 2 * years + 4 * months |
| 136 | + , inputSeconds = 3 * weeks + 5 * days + 18 * hours + 56 * minutes + 23 * seconds + 563 * milliseconds |
| 137 | + , asText = "P2Y4M3W5DT18H56M23.563S" |
| 138 | + } |
| 139 | + ] |
| 140 | + |
| 141 | + return () |
| 142 | + |
| 143 | +initializeTable :: TestEnv -> IO () |
| 144 | +initializeTable TestEnv{..} = withTransaction conn $ do |
| 145 | + execute_ conn |
| 146 | + [sql| CREATE TEMPORARY TABLE testinterval |
| 147 | + ( id serial, sample interval, PRIMARY KEY(id) ) |] |
| 148 | + |
| 149 | + return () |
| 150 | + |
| 151 | +checkRoundTrip :: TestEnv -> IntervalTestCase -> IO () |
| 152 | +checkRoundTrip TestEnv{..} IntervalTestCase{..} = do |
| 153 | + |
| 154 | + let input = CalendarDiffTime |
| 155 | + { ctMonths = inputMonths |
| 156 | + , ctTime = inputSeconds |
| 157 | + } |
| 158 | + |
| 159 | + [(returnedId :: Int, output :: CalendarDiffTime)] <- query conn [sql| |
| 160 | + INSERT INTO testinterval (sample) |
| 161 | + VALUES (?) |
| 162 | + RETURNING id, sample |
| 163 | + |] (Only input) |
| 164 | + |
| 165 | + assertBool ("CalendarDiffTime did not round-trip from Haskell to SQL and back (" ++ label ++ ")") $ |
| 166 | + output == input |
| 167 | + |
| 168 | + [(Only isExpectedIso)] <- query conn [sql| |
| 169 | + SELECT sample = (?)::interval |
| 170 | + FROM testinterval |
| 171 | + WHERE id = ? |
| 172 | + |] (asText, returnedId) |
| 173 | + |
| 174 | + assertBool ("CalendarDiffTime inserted did not match ISO8601 equivalent \"" ++ asText ++ "\". (" ++ label ++ ")") |
| 175 | + isExpectedIso |
| 176 | + |
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