chore: add initial test cases

---
type: pre_push_report
description: Results of running various checks prior to pushing changes.
report:
  - task: run_javascript_examples
    status: na
  - task: run_c_examples
    status: na
  - task: run_cpp_examples
    status: na
  - task: run_javascript_readme_examples
    status: na
  - task: run_c_benchmarks
    status: na
  - task: run_cpp_benchmarks
    status: na
  - task: run_fortran_benchmarks
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  - task: run_javascript_benchmarks
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  - task: run_julia_benchmarks
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  - task: run_python_benchmarks
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    status: na
  - task: run_javascript_tests
    status: passed
---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/column_major_complex_access_pattern.json

@@ -0,0 +1,20 @@
+{
+    "trans": "no-transpose",
+    "strideA1": -2,
+    "strideA2": -5,
+    "offsetA": 14,
+    "strideX": -1,
+    "offsetX": 2,
+    "strideY": -1,
+    "offsetY": 2,
+    "M": 3,
+    "N": 3,
+    "KL": 1,
+    "KU": 1,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "A": [ 0, 1, 2, 3, 4, 5, 6, 7, 0 ],
+    "x": [ 3.0, 2.0, 1.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "y_out": [ 4.0, 12.0, 11.0 ]
+  }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/column_major_nt.json

@@ -0,0 +1,22 @@
+{
+    "order": "column-major",
+    "trans": "no-transpose",
+    "M": 3,
+    "N": 3,
+    "KL": 1,
+    "KU": 1,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "lda": 3,
+    "A": [ 0.0, 3.0, 5.0, 7.0, 2.0, 4.0, 6.0, 8.0, 0.0 ],
+    "x": [ 1.0, 2.0 , 3.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "strideA1": 1,
+    "strideA2": 3,
+    "offsetA": 0,
+    "strideX": 1,
+    "offsetX": 0,
+    "strideY": 1,
+    "offsetY": 0,
+    "y_out": [ 9, 14.5, 17.5 ]
+  }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/column_major_t.json

@@ -0,0 +1,22 @@
+{
+    "order": "column-major",
+    "trans": "transpose",
+    "M": 3,
+    "N": 3,
+    "KL": 1,
+    "KU": 1,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "lda": 3,
+    "A": [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 0.0 ],
+    "x": [ 1.0, 2.0, 3.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "strideA1": 1,
+    "strideA2": 3,
+    "offsetA": 0,
+    "strideX": 1,
+    "offsetX": 0,
+    "strideY": 1,
+    "offsetY": 0,
+    "y_out": [ 3.0, 14.0, 18.0 ]
+  }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/row_major_nt.json

@@ -0,0 +1,22 @@
+{
+    "order": "row-major",
+    "trans": "no-transpose",
+    "M": 3,
+    "N": 3,
+    "KL": 1,
+    "KU": 1,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "lda": 3,
+    "A": [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 0.0 ],
+    "x": [ 1.0, 2.0, 3.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "strideA1": 3,
+    "strideA2": 1,
+    "offsetA": 0,
+    "strideX": 1,
+    "offsetX": 0,
+    "strideY": 1,
+    "offsetY": 0,
+    "y_out": [ 3.0, 14.0, 18.0 ]
+  }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/row_major_t.json

@@ -0,0 +1,22 @@
+{
+    "order": "row-major",
+    "trans": "transpose",
+    "M": 3,
+    "N": 3,
+    "KL": 1,
+    "KU": 1,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "lda": 3,
+    "A": [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 0.0 ],
+    "x": [ 1.0, 2.0, 3.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "strideA1": 3,
+    "strideA2": 1,
+    "offsetA": 0,
+    "strideX": 1,
+    "offsetX": 0,
+    "strideY": 1,
+    "offsetY": 0,
+    "y_out": [ 4.0, 15.0, 17.0 ]
+  }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/row_major_xnyn.json

@@ -0,0 +1,20 @@
+{
+    "order": "row-major",
+    "trans": "no-transpose",
+    "M": 3,
+    "N": 3,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "lda": 3,
+    "A": [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 0.0 ],
+    "x": [ 1.0, 2.0, 3.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "strideA1": 3,
+    "strideA2": 1,
+    "offsetA": 0,
+    "strideX": -1,
+    "offsetX": 1,
+    "strideY": -1,
+    "offsetY": 3,
+    "y_out": [ 12.0, 9.5, 7.0, 4.5 ]
+  }