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Nothing about being a library changes the setup: you configure evlog the way an application would, because inside a test that is exactly what your code is.",[616,617,619],"h2",{"id":618},"collect-events-with-a-drain-function","Collect events with a drain function",[604,621,622],{},"A drain function runs synchronously when an event is emitted, so a plain array is enough:",[624,625,631],"pre",{"className":626,"code":627,"filename":628,"language":629,"meta":630,"style":630},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { initLogger } from 'evlog'\nimport type { DrainContext, WideEvent } from 'evlog'\n\nconst events: WideEvent[] = []\n\nbeforeAll(() => {\n  initLogger({ drain: (ctx: DrainContext) => { events.push(ctx.event) } })\n})\n\n\u002F\u002F run the operation under test, then assert on the collected events\nexpect(events[0].source).toBe('mylib')\n","test\u002Fevents.test.ts","typescript","",[608,632,633,666,695,702,727,732,751,814,821,826,833],{"__ignoreMap":630},[634,635,638,642,646,650,653,656,659,663],"span",{"class":636,"line":637},"line",1,[634,639,641],{"class":640},"s7zQu","import",[634,643,645],{"class":644},"sMK4o"," {",[634,647,649],{"class":648},"sTEyZ"," initLogger",[634,651,652],{"class":644}," }",[634,654,655],{"class":640}," from",[634,657,658],{"class":644}," '",[634,660,662],{"class":661},"sfazB","evlog",[634,664,665],{"class":644},"'\n",[634,667,669,671,674,676,679,682,685,687,689,691,693],{"class":636,"line":668},2,[634,670,641],{"class":640},[634,672,673],{"class":640}," type",[634,675,645],{"class":644},[634,677,678],{"class":648}," DrainContext",[634,680,681],{"class":644},",",[634,683,684],{"class":648}," WideEvent",[634,686,652],{"class":644},[634,688,655],{"class":640},[634,690,658],{"class":644},[634,692,662],{"class":661},[634,694,665],{"class":644},[634,696,698],{"class":636,"line":697},3,[634,699,701],{"emptyLinePlaceholder":700},true,"\n",[634,703,705,709,712,715,718,721,724],{"class":636,"line":704},4,[634,706,708],{"class":707},"spNyl","const",[634,710,711],{"class":648}," events",[634,713,714],{"class":644},":",[634,716,684],{"class":717},"sBMFI",[634,719,720],{"class":648},"[] ",[634,722,723],{"class":644},"=",[634,725,726],{"class":648}," []\n",[634,728,730],{"class":636,"line":729},5,[634,731,701],{"emptyLinePlaceholder":700},[634,733,735,739,742,745,748],{"class":636,"line":734},6,[634,736,738],{"class":737},"s2Zo4","beforeAll",[634,740,741],{"class":648},"(",[634,743,744],{"class":644},"()",[634,746,747],{"class":707}," =>",[634,749,750],{"class":644}," {\n",[634,752,754,757,760,763,766,768,771,775,777,779,782,784,786,788,791,794,796,798,800,803,806,809,811],{"class":636,"line":753},7,[634,755,756],{"class":737},"  initLogger",[634,758,741],{"class":759},"swJcz",[634,761,762],{"class":644},"{",[634,764,765],{"class":737}," drain",[634,767,714],{"class":644},[634,769,770],{"class":644}," (",[634,772,774],{"class":773},"sHdIc","ctx",[634,776,714],{"class":644},[634,778,678],{"class":717},[634,780,781],{"class":644},")",[634,783,747],{"class":707},[634,785,645],{"class":644},[634,787,711],{"class":648},[634,789,790],{"class":644},".",[634,792,793],{"class":737},"push",[634,795,741],{"class":759},[634,797,774],{"class":648},[634,799,790],{"class":644},[634,801,802],{"class":648},"event",[634,804,805],{"class":759},") ",[634,807,808],{"class":644},"}",[634,810,652],{"class":644},[634,812,813],{"class":759},")\n",[634,815,817,819],{"class":636,"line":816},8,[634,818,808],{"class":644},[634,820,813],{"class":648},[634,822,824],{"class":636,"line":823},9,[634,825,701],{"emptyLinePlaceholder":700},[634,827,829],{"class":636,"line":828},10,[634,830,832],{"class":831},"sHwdD","\u002F\u002F run the operation under test, then assert on the collected events\n",[634,834,836,839,842,846,849,851,854,856,859,861,864,867,869],{"class":636,"line":835},11,[634,837,838],{"class":737},"expect",[634,840,841],{"class":648},"(events[",[634,843,845],{"class":844},"sbssI","0",[634,847,848],{"class":648},"]",[634,850,790],{"class":644},[634,852,853],{"class":648},"source)",[634,855,790],{"class":644},[634,857,858],{"class":737},"toBe",[634,860,741],{"class":648},[634,862,863],{"class":644},"'",[634,865,866],{"class":661},"mylib",[634,868,863],{"class":644},[634,870,813],{"class":648},[604,872,873,874,876,877,880,881,884],{},"Assert on the fields you promised the host: the ",[608,875,610],{},", the ",[608,878,879],{},"operation",", the domain fields you ",[608,882,883],{},"set",". Do not assert on console output; pretty printing is presentation, and the drained event is the contract.",[616,886,888],{"id":887},"inspect-events-with-the-memory-drain","Inspect events with the memory drain",[604,890,891],{},"The memory drain keeps events in a ring buffer you can read and clear, useful when an operation emits several events and you want them as a list:",[624,893,895],{"className":626,"code":894,"filename":628,"language":629,"meta":630,"style":630},"import { createMemoryDrain, readMemoryLogs } from 'evlog\u002Fmemory'\nimport { initLogger } from 'evlog'\n\nbeforeAll(() => {\n  initLogger({ drain: createMemoryDrain({ store: 'test' }) })\n})\n\n\u002F\u002F run the operation under test, then give the drain a tick:\n\u002F\u002F emit() hands events to the drain without awaiting it\nawait new Promise(resolve => setTimeout(resolve, 0))\n\nconst events = readMemoryLogs({ store: 'test', filter: e => e.source === 'mylib' })\n",[608,896,897,922,940,944,956,994,1000,1004,1009,1014,1046,1050],{"__ignoreMap":630},[634,898,899,901,903,906,908,911,913,915,917,920],{"class":636,"line":637},[634,900,641],{"class":640},[634,902,645],{"class":644},[634,904,905],{"class":648}," createMemoryDrain",[634,907,681],{"class":644},[634,909,910],{"class":648}," readMemoryLogs",[634,912,652],{"class":644},[634,914,655],{"class":640},[634,916,658],{"class":644},[634,918,919],{"class":661},"evlog\u002Fmemory",[634,921,665],{"class":644},[634,923,924,926,928,930,932,934,936,938],{"class":636,"line":668},[634,925,641],{"class":640},[634,927,645],{"class":644},[634,929,649],{"class":648},[634,931,652],{"class":644},[634,933,655],{"class":640},[634,935,658],{"class":644},[634,937,662],{"class":661},[634,939,665],{"class":644},[634,941,942],{"class":636,"line":697},[634,943,701],{"emptyLinePlaceholder":700},[634,945,946,948,950,952,954],{"class":636,"line":704},[634,947,738],{"class":737},[634,949,741],{"class":648},[634,951,744],{"class":644},[634,953,747],{"class":707},[634,955,750],{"class":644},[634,957,958,960,962,964,966,968,970,972,974,977,979,981,984,986,988,990,992],{"class":636,"line":729},[634,959,756],{"class":737},[634,961,741],{"class":759},[634,963,762],{"class":644},[634,965,765],{"class":759},[634,967,714],{"class":644},[634,969,905],{"class":737},[634,971,741],{"class":759},[634,973,762],{"class":644},[634,975,976],{"class":759}," store",[634,978,714],{"class":644},[634,980,658],{"class":644},[634,982,983],{"class":661},"test",[634,985,863],{"class":644},[634,987,652],{"class":644},[634,989,805],{"class":759},[634,991,808],{"class":644},[634,993,813],{"class":759},[634,995,996,998],{"class":636,"line":734},[634,997,808],{"class":644},[634,999,813],{"class":648},[634,1001,1002],{"class":636,"line":753},[634,1003,701],{"emptyLinePlaceholder":700},[634,1005,1006],{"class":636,"line":816},[634,1007,1008],{"class":831},"\u002F\u002F run the operation under test, then give the drain a tick:\n",[634,1010,1011],{"class":636,"line":823},[634,1012,1013],{"class":831},"\u002F\u002F emit() hands events to the drain without awaiting it\n",[634,1015,1016,1019,1022,1025,1027,1030,1032,1035,1038,1040,1043],{"class":636,"line":828},[634,1017,1018],{"class":640},"await",[634,1020,1021],{"class":644}," new",[634,1023,1024],{"class":717}," Promise",[634,1026,741],{"class":648},[634,1028,1029],{"class":773},"resolve",[634,1031,747],{"class":707},[634,1033,1034],{"class":737}," setTimeout",[634,1036,1037],{"class":648},"(resolve",[634,1039,681],{"class":644},[634,1041,1042],{"class":844}," 0",[634,1044,1045],{"class":648},"))\n",[634,1047,1048],{"class":636,"line":835},[634,1049,701],{"emptyLinePlaceholder":700},[634,1051,1053,1055,1058,1060,1062,1064,1066,1068,1070,1072,1074,1076,1078,1081,1083,1086,1088,1090,1092,1095,1098,1100,1102,1104,1106],{"class":636,"line":1052},12,[634,1054,708],{"class":707},[634,1056,1057],{"class":648}," events ",[634,1059,723],{"class":644},[634,1061,910],{"class":737},[634,1063,741],{"class":648},[634,1065,762],{"class":644},[634,1067,976],{"class":759},[634,1069,714],{"class":644},[634,1071,658],{"class":644},[634,1073,983],{"class":661},[634,1075,863],{"class":644},[634,1077,681],{"class":644},[634,1079,1080],{"class":737}," filter",[634,1082,714],{"class":644},[634,1084,1085],{"class":773}," e",[634,1087,747],{"class":707},[634,1089,1085],{"class":648},[634,1091,790],{"class":644},[634,1093,1094],{"class":648},"source ",[634,1096,1097],{"class":644},"===",[634,1099,658],{"class":644},[634,1101,866],{"class":661},[634,1103,863],{"class":644},[634,1105,652],{"class":644},[634,1107,813],{"class":648},[616,1109,1111],{"id":1110},"lock-error-codes-down","Lock error codes down",[604,1113,1114,1115,1118],{},"Catalog errors are wire format (see ",[1116,1117,56],"a",{"href":468},"), so assert through the factory rather than a string literal. 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