test: adjust tolerance levels in test.native.js for triangular MGF consistency

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---

Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/triangular/mgf/test/test.native.js

@@ -103,9 +103,7 @@ tape( 'the function evaluates the MGF for `x` given a small range `b - a`', opts
 			t.equal( y, expected[i], 'x: '+x[i]+', a: '+a[i]+', b: '+b[i]+', c: '+c[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-
-			// FIXME: the tolerance for the C implementation is widely different from the JavaScript implementation, and it is not clear why.
-			tol = 1.0e7 * EPS * abs( expected[ i ] );
+			tol = 4.0 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[ i ]+'. a: '+a[i]+'. b: '+b[i]+'. c: '+c[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}
@@ -134,9 +132,7 @@ tape( 'the function evaluates the MGF for `x` given a medium range `b - a`', opt
 			t.equal( y, expected[i], 'x: '+x[i]+', a: '+a[i]+', b: '+b[i]+', c: '+c[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-
-			// FIXME: the tolerance for the C implementation is widely different from the JavaScript implementation, and it is not clear why.
-			tol = 1.0e7 * EPS * abs( expected[ i ] );
+			tol = 4.0 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[ i ]+'. a: '+a[i]+'. b: '+b[i]+'. c: '+c[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}
@@ -165,9 +161,7 @@ tape( 'the function evaluates the MGF for `x` given a large range `b - a`', opts
 			t.equal( y, expected[i], 'x: '+x[i]+', a: '+a[i]+', b: '+b[i]+', c: '+c[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-
-			// FIXME: the tolerance for the C implementation is widely different from the JavaScript implementation, and it is not clear why.
-			tol = 1.0e7 * EPS * abs( expected[ i ] );
+			tol = 4.0 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[ i ]+'. a: '+a[i]+'. b: '+b[i]+'. c: '+c[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}