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const fc = require('fast-check'); // Function under test function isSubstring(pattern, text) { return text.indexOf(pattern) !== -1; } // Property based test fc.assert( fc.property(fc.string(), fc.string(), fc.string(), (a, b, c) => { // For any a, b, c strings // b is a substring of a + b + c return isSubstring(b, a + b + c); }), );