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| 1 | +// Testing/Assertion functions // |
| 2 | + |
| 3 | +export async function sleep(milliseconds) { |
| 4 | + return new Promise((resolve) => { |
| 5 | + setTimeout(resolve, milliseconds); |
| 6 | + }); |
| 7 | +} |
| 8 | + |
| 9 | +// TODO: Implement ReadableStream getIterator() and [@@asyncIterator]() methods |
| 10 | +export async function streamToString(stream) { |
| 11 | + const decoder = new TextDecoder(); |
| 12 | + let string = ""; |
| 13 | + let reader = stream.getReader(); |
| 14 | + // eslint-disable-next-line no-constant-condition |
| 15 | + while (true) { |
| 16 | + const { done, value } = await reader.read(); |
| 17 | + if (done) { |
| 18 | + return string; |
| 19 | + } |
| 20 | + string += decoder.decode(value); |
| 21 | + } |
| 22 | +} |
| 23 | + |
| 24 | +export function iteratableToStream(iterable) { |
| 25 | + return new ReadableStream({ |
| 26 | + async pull(controller) { |
| 27 | + for await (const value of iterable) { |
| 28 | + controller.enqueue(value); |
| 29 | + } |
| 30 | + controller.close(); |
| 31 | + }, |
| 32 | + }); |
| 33 | +} |
| 34 | + |
| 35 | +export function pass(message = "") { |
| 36 | + return new Response(message); |
| 37 | +} |
| 38 | + |
| 39 | +export function fail(message = "") { |
| 40 | + throw new Response(message, { status: 500 }); |
| 41 | +} |
| 42 | + |
| 43 | +function prettyPrintSymbol(a) { |
| 44 | + if (typeof a === "symbol") { |
| 45 | + return String(a); |
| 46 | + } |
| 47 | + return a; |
| 48 | +} |
| 49 | +export function assert(actual, expected, code) { |
| 50 | + if (!deepEqual(actual, expected)) { |
| 51 | + fail( |
| 52 | + `Expected \`${code}\` to equal \`${JSON.stringify(prettyPrintSymbol(expected))}\` - Found \`${JSON.stringify(prettyPrintSymbol(actual))}\`` |
| 53 | + ); |
| 54 | + } |
| 55 | +} |
| 56 | + |
| 57 | +export async function assertResolves(func) { |
| 58 | + try { |
| 59 | + await func(); |
| 60 | + } catch (error) { |
| 61 | + fail( |
| 62 | + `Expected \`${func.toString()}\` to resolve - Found it rejected: ${error.name}: ${error.message}` |
| 63 | + ); |
| 64 | + } |
| 65 | +} |
| 66 | + |
| 67 | +export async function assertRejects(func, errorClass, errorMessage) { |
| 68 | + try { |
| 69 | + await func(); |
| 70 | + } catch (error) { |
| 71 | + if (errorClass) { |
| 72 | + if (error instanceof errorClass === false) { |
| 73 | + fail( |
| 74 | + `Expected \`${func.toString()}\` to reject instance of \`${errorClass.name}\` - Found instance of \`${error.name}\`` |
| 75 | + ); |
| 76 | + } |
| 77 | + } |
| 78 | + |
| 79 | + if (errorMessage) { |
| 80 | + if (error.message !== errorMessage) { |
| 81 | + fail( |
| 82 | + `Expected \`${func.toString()}\` to reject error message of \`${errorMessage}\` - Found \`${error.message}\`` |
| 83 | + ); |
| 84 | + } |
| 85 | + } |
| 86 | + |
| 87 | + return; |
| 88 | + } |
| 89 | + fail( |
| 90 | + `Expected \`${func.toString()}\` to reject - Found it did not reject` |
| 91 | + ); |
| 92 | +} |
| 93 | + |
| 94 | +export function assertThrows(func, errorClass, errorMessage) { |
| 95 | + try { |
| 96 | + func(); |
| 97 | + } catch (error) { |
| 98 | + if (errorClass) { |
| 99 | + if (error instanceof errorClass === false) { |
| 100 | + fail( |
| 101 | + `Expected \`${func.toString()}\` to throw instance of \`${errorClass.name}\` - Found instance of \`${error.name}\`: ${error.message}\n${error.stack}` |
| 102 | + ); |
| 103 | + } |
| 104 | + } |
| 105 | + |
| 106 | + if (errorMessage) { |
| 107 | + if (error.message !== errorMessage) { |
| 108 | + fail( |
| 109 | + `Expected \`${func.toString()}\` to throw error message of \`${errorMessage}\` - Found \`${error.message}\`` |
| 110 | + ); |
| 111 | + } |
| 112 | + } |
| 113 | + |
| 114 | + return; |
| 115 | + } |
| 116 | + fail( |
| 117 | + `Expected \`${func.toString()}\` to throw - Found it did not throw` |
| 118 | + ); |
| 119 | +} |
| 120 | + |
| 121 | +export function assertDoesNotThrow(func) { |
| 122 | + try { |
| 123 | + func(); |
| 124 | + } catch (error) { |
| 125 | + fail( |
| 126 | + `Expected \`${func.toString()}\` to not throw - Found it did throw: ${error.name}: ${error.message}` |
| 127 | + ); |
| 128 | + } |
| 129 | +} |
| 130 | + |
| 131 | +export function deepEqual(a, b) { |
| 132 | + var aKeys; |
| 133 | + var bKeys; |
| 134 | + var typeA; |
| 135 | + var typeB; |
| 136 | + var key; |
| 137 | + var i; |
| 138 | + |
| 139 | + typeA = typeof a; |
| 140 | + typeB = typeof b; |
| 141 | + if (a === null || typeA !== "object") { |
| 142 | + if (b === null || typeB !== "object") { |
| 143 | + return a === b; |
| 144 | + } |
| 145 | + return false; |
| 146 | + } |
| 147 | + |
| 148 | + // Case: `a` is of type 'object' |
| 149 | + if (b === null || typeB !== "object") { |
| 150 | + return false; |
| 151 | + } |
| 152 | + if (Object.getPrototypeOf(a) !== Object.getPrototypeOf(b)) { |
| 153 | + return false; |
| 154 | + } |
| 155 | + if (a instanceof Date) { |
| 156 | + return a.getTime() === b.getTime(); |
| 157 | + } |
| 158 | + if (a instanceof RegExp) { |
| 159 | + return a.source === b.source && a.flags === b.flags; |
| 160 | + } |
| 161 | + if (a instanceof Error) { |
| 162 | + if (a.message !== b.message || a.name !== b.name) { |
| 163 | + return false; |
| 164 | + } |
| 165 | + } |
| 166 | + |
| 167 | + aKeys = Object.keys(a); |
| 168 | + bKeys = Object.keys(b); |
| 169 | + if (aKeys.length !== bKeys.length) { |
| 170 | + return false; |
| 171 | + } |
| 172 | + aKeys.sort(); |
| 173 | + bKeys.sort(); |
| 174 | + |
| 175 | + // Cheap key test: |
| 176 | + for (i = 0; i < aKeys.length; i++) { |
| 177 | + if (aKeys[i] !== bKeys[i]) { |
| 178 | + return false; |
| 179 | + } |
| 180 | + } |
| 181 | + // Possibly expensive deep equality test for each corresponding key: |
| 182 | + for (i = 0; i < aKeys.length; i++) { |
| 183 | + key = aKeys[i]; |
| 184 | + if (!deepEqual(a[key], b[key])) { |
| 185 | + return false; |
| 186 | + } |
| 187 | + } |
| 188 | + return typeA === typeB; |
| 189 | +} |
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