mongo/jstests/hooks/write_conflicts/enable_write_conflicts.js

const chance = TestData.WTWriteConflictExceptionChance;
assert.gte(chance, 0, "WTWriteConflictExceptionChance must be >= 0");
assert.lte(chance, 1, "WTWriteConflictExceptionChance must be <= 1");

const readChance = TestData.WTWriteConflictExceptionForReadsChance;
assert.gte(readChance, 0, "WTWriteConflictExceptionForReadsChance must be >= 0");
assert.lte(readChance, 1, "WTWriteConflictExceptionForReadsChance must be <= 1");

assert.commandWorked(
    db.adminCommand({configureFailPoint: "WTWriteConflictException", mode: {activationProbability: chance}}),
);

assert.commandWorked(
    db.adminCommand({
        configureFailPoint: "WTWriteConflictExceptionForReads",
        mode: {activationProbability: readChance},
    }),
);