test: add tests to achieve full coverage in binomcoeff

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---

Author: Planeshifter

lib/node_modules/@stdlib/math/base/special/binomcoeff/test/test.js

@@ -23,6 +23,7 @@
 var tape = require( 'tape' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var absf = require( '@stdlib/math/base/special/absf' );
+var PINF = require( '@stdlib/constants/float32/pinf' );
 var EPS = require( '@stdlib/constants/float32/eps' );
 var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
 var binomcoeff = require( './../lib' );
@@ -128,3 +129,18 @@ tape( 'the function returns `0` when `k` is greater than `n`', function test( t
 	t.strictEqual( v, 0.0, 'returns expected value' );
 	t.end();
 });
+
+tape( 'the function returns `+infinity` for large binomial coefficients that overflow', function test( t ) {
+	var v;
+
+	v = binomcoeff( 140, 70 );
+	t.strictEqual( v, PINF, 'returns expected value' );
+
+	v = binomcoeff( 150, 75 );
+	t.strictEqual( v, PINF, 'returns expected value' );
+
+	v = binomcoeff( 200, 100 );
+	t.strictEqual( v, PINF, 'returns expected value' );
+
+	t.end();
+});