chore: add basic unit test

Author: eduardomourar

smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/StructureGeneratorTest.java

@@ -551,7 +551,19 @@ public void skipsFilterOnEncounteringRecursiveShapes() {
                                 + "  })\n");
     }
 
+    @Test
+    public void properlyGeneratesRequiredMessageMemberNotBackwardCompatible() {
+        testStructureCodegenBase("test-required-member.smithy",
+                                "export interface GetFooOutput {\n"
+                                + "  someRequiredMember: string;\n"
+                                + "}\n", false);
+    }
+
     private String testStructureCodegen(String file, String expectedType) {
+        return testStructureCodegenBase(file, expectedType, true);
+    }
+
+    private String testStructureCodegenBase(String file, String expectedType, boolean backwardCompatibleRequiredMember) {
         Model model = Model.assembler()
                 .addImport(getClass().getResource(file))
                 .assemble()
@@ -564,6 +576,7 @@ private String testStructureCodegen(String file, String expectedType) {
                         .withMember("service", Node.from("smithy.example#Example"))
                         .withMember("package", Node.from("example"))
                         .withMember("packageVersion", Node.from("1.0.0"))
+                        .withMember("backwardCompatibleRequiredMember", Node.from(backwardCompatibleRequiredMember))
                         .build())
                 .build();
 

smithy-typescript-codegen/src/test/resources/software/amazon/smithy/typescript/codegen/test-required-member.smithy

@@ -0,0 +1,17 @@
+namespace smithy.example
+
+service Example {
+    version: "1.0.0",
+    operations: [GetFoo]
+}
+
+operation GetFoo {
+    input: GetFooInput,
+    output: GetFooOutput
+}
+
+structure GetFooInput {}
+structure GetFooOutput {
+    @required
+    someRequiredMember: String
+}