How to use the warning.mock function in warning
To help you get started, we’ve selected a few warning examples, based on popular ways it is used in public projects.
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facebook / relay / packages / relay-test-utils-internal / Matchers.js View on Github 
}
function formatActual(calls) {
if (calls.length) {
return calls
.map(args => {
return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !!warned,
message: () =>
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,return calls
.map(args => {
return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !!warned,
message: () =>
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,
};
}
// Custom case: explicit expectation.}
function formatActual(calls) {
if (calls.length) {
return calls
.map(args => {
return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !!warned,
message: () =>
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,}
function formatActual(calls) {
if (calls.length) {
return calls
.map(args => {
return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !!warned,
message: () =>
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !!warned,
message: () =>
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,
};
}
// Custom case: explicit expectation.
if (!Array.isArray(expected)) {
expected = [expected];return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !!warned,
message: () =>
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,
};
}
// Custom case: explicit expectation.
if (!Array.isArray(expected)) {
expected = [expected];return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !(negative ? warned : !warned),
message:
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,
};
}
// Custom case: explicit expectation.
if (!Array.isArray(expected)) {
expected = [expected];}
function formatActual(calls) {
if (calls.length) {
return calls
.map(args => {
return formatArray([!!args[0]].concat(args.slice(1)));
})
.join(', ');
} else {
return '[]';
}
}
const warning = require('warning');
if (!warning.mock) {
throw new Error("toWarn(): Requires `jest.mock('warning')`.");
}
const callsCount = warning.mock.calls.length;
actual();
const calls = warning.mock.calls.slice(callsCount);
// Simple case: no explicit expectation.
if (!expected) {
const warned = calls.filter(args => !args[0]).length;
return {
pass: !(negative ? warned : !warned),
message:
`Expected ${negative ? 'not ' : ''}to warn but ` +
'`warning` received the following calls: ' +
`${formatActual(calls)}.`,
