fixed invalid TS call and added test files (#6495)

e581013e3d broke TS generation - please don't use "replace" to refactor function names :)

tests/namespace_test/namespace-a/namespace-b/struct-in-nested-n-s.ts

@@ -0,0 +1,77 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class StructInNestedNS {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+__init(i:number, bb:flatbuffers.ByteBuffer):StructInNestedNS {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+a():number {
+  return this.bb!.readInt32(this.bb_pos);
+}
+
+mutate_a(value:number):boolean {
+  this.bb!.writeInt32(this.bb_pos + 0, value);
+  return true;
+}
+
+b():number {
+  return this.bb!.readInt32(this.bb_pos + 4);
+}
+
+mutate_b(value:number):boolean {
+  this.bb!.writeInt32(this.bb_pos + 4, value);
+  return true;
+}
+
+static getFullyQualifiedName():string {
+  return 'NamespaceA.NamespaceB.StructInNestedNS';
+}
+
+static sizeOf():number {
+  return 8;
+}
+
+static createStructInNestedNS(builder:flatbuffers.Builder, a: number, b: number):flatbuffers.Offset {
+  builder.prep(4, 8);
+  builder.writeInt32(b);
+  builder.writeInt32(a);
+  return builder.offset();
+}
+
+
+unpack(): StructInNestedNST {
+  return new StructInNestedNST(
+    this.a(),
+    this.b()
+  );
+}
+
+
+unpackTo(_o: StructInNestedNST): void {
+  _o.a = this.a();
+  _o.b = this.b();
+}
+}
+
+export class StructInNestedNST {
+constructor(
+  public a: number = 0,
+  public b: number = 0
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return StructInNestedNS.createStructInNestedNS(builder,
+    this.a,
+    this.b
+  );
+}
+}