test: add missing test

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
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    status: passed
  - task: lint_editorconfig
    status: passed
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    status: na
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    status: na
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    status: na
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    status: na
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    status: na
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    status: na
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  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Om-A-osc

lib/node_modules/@stdlib/stats/strided/snancount/test/test.ndarray.js

@@ -66,6 +66,21 @@ tape( 'if provided an `N` parameter less than or equal to `0`, the function retu
 	t.end();
 });
 
+tape( 'if provided an `N` parameter equal to `1`, the function counts the first indexed element', function test( t ) {
+	var x;
+	var v;
+
+	x = new Float32Array( [ NaN, -2.0, -4.0, 5.0, 3.0 ] );
+
+	v = snancount( 1, x, 1, 0 );
+	t.strictEqual( v, 0, 'returns expected value' );
+
+	x[ 0 ] = 1.0;
+	v = snancount( 1, x, 1, 0 );
+	t.strictEqual( v, 1, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function supports a `stride` parameter', function test( t ) {
 	var x;
 	var v;