chore: add 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
    status: na
  - task: run_javascript_benchmarks
    status: na
  - task: run_julia_benchmarks
    status: na
  - task: run_python_benchmarks
    status: na
  - task: run_r_benchmarks
    status: na
  - task: run_javascript_tests
    status: failed
---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/column_major_sa1_sa2.json

@@ -0,0 +1,20 @@
+{
+    "trans": "no-transpose",
+    "M": 3,
+    "N": 3,
+    "KL": 1,
+    "KU": 1,
+    "alpha": 0.5,
+    "beta": 0.5,
+    "A": [ 0.0, 999.0, 3.0, 5.0, 999.0, 5.0, 999.0, 999.0, 999.0, 999.0, 999.0, 999.0, 999.0, 3.0, 5.0, 999.0, 0.0 ],
+    "x": [ 1.0, 2.0, 3.0 ],
+    "y": [ 1.0, 2.0, 3.0 ],
+    "strideA1": 5,
+    "strideA2": 3,
+    "offsetA": 0,
+    "strideX": 1,
+    "offsetX": 0,
+    "strideY": 1,
+    "offsetY": 0,
+    "y_out": [ 502.0, 510.0, 1504.0 ]
+  }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/column_major_xpyp.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, 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": [ 4.0, 15.0, 17.0 ]
+  }

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

@@ -3,18 +3,20 @@
     "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 ],
+    "x": [ 2.0, 1.0 ],
+    "y": [ 1.0, 2.0, 3.0, 4.0 ],
     "strideA1": 3,
     "strideA2": 1,
     "offsetA": 0,
     "strideX": -1,
     "offsetX": 1,
     "strideY": -1,
     "offsetY": 3,
-    "y_out": [ 12.0, 9.5, 7.0, 4.5 ]
+    "y_out": [ 2.5, 6.5, 10.5 ]
   }

lib/node_modules/@stdlib/blas/base/sgbmv/test/fixtures/row_major_xpyp.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 ]
+  }