test: add tests

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
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    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
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  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
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  - task: lint_python
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    status: na
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    status: na
  - task: lint_c_tests_fixtures
    status: na
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  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: headlessNode

lib/node_modules/@stdlib/ndarray/flatten-by/test/test.js

@@ -418,7 +418,7 @@ tape( 'the function supports specifying the callback execution context (column-m
 	};
 
 	y = flattenBy( x, clbk, ctx );
-	expected = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );
+	expected = new Float64Array( [ 1.0, 5.0, 3.0, 7.0, 2.0, 6.0, 4.0, 8.0 ] );
 
 	t.notEqual( y, x, 'returns expected value' );
 	t.notEqual( getData( y ), xbuf, 'returns expected value' );