chore: clean-up and fix test tolerances

---
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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/dists/weibull/kurtosis/src/addon.c

@@ -19,5 +19,4 @@
 #include "stdlib/stats/base/dists/weibull/kurtosis.h"
 #include "stdlib/math/base/napi/binary.h"
 
-// cppcheck-suppress shadowFunction
 STDLIB_MATH_BASE_NAPI_MODULE_DD_D( stdlib_base_dists_weibull_kurtosis )

lib/node_modules/@stdlib/stats/base/dists/weibull/kurtosis/test/test.js

@@ -25,6 +25,7 @@ var abs = require( '@stdlib/math/base/special/abs' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
+var EPS = require( '@stdlib/constants/float64/eps' );
 var kurtosis = require( './../lib' );
 
 
@@ -111,7 +112,7 @@ tape( 'the function returns the excess kurtosis of a Weibull distribution', func
 			t.equal( y, expected[i], 'k: '+k[i]+', lambda: '+lambda[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-			tol = 1e-9 * abs( expected[ i ] );
+			tol = 1.5e6 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. k: '+k[i]+'. lambda: '+lambda[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}

lib/node_modules/@stdlib/stats/base/dists/weibull/kurtosis/test/test.native.js

@@ -27,6 +27,7 @@ var abs = require( '@stdlib/math/base/special/abs' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
+var EPS = require( '@stdlib/constants/float64/eps' );
 
 
 // VARIABLES //
@@ -120,7 +121,7 @@ tape( 'the function returns the excess kurtosis of a Weibull distribution', opts
 			t.equal( y, expected[i], 'k: '+k[i]+', lambda: '+lambda[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-			tol = 1e-9 * abs( expected[ i ] );
+			tol = 1.5e6 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. k: '+k[i]+'. lambda: '+lambda[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}