Add TS usage tests (#6)

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

test/e2e/typescript/2020-12/object_with_additional_properties/test.ts

@@ -0,0 +1,10 @@
+import { Person } from "./expected";
+
+const person: Person = {
+  name: "John Doe"
+};
+
+const invalidPerson: Person = {
+  // @ts-expect-error
+  name: 123
+};

test/e2e/typescript/CMakeLists.txt

@@ -27,6 +27,12 @@ foreach(DIALECT_DIRECTORY ${TYPESCRIPT_DIALECT_DIRECTORIES})
         list(APPEND E2E_SCHEMAS "${CASE_DIRECTORY}/schema.json")
         add_test(NAME "e2e.typescript.tsc.${DIALECT_NAME}.${CASE_NAME}/expected.d.ts"
           COMMAND "${TSC_BIN}" --noEmit "${CASE_DIRECTORY}/expected.d.ts")
+
+        # TODO: Make this required for every case
+        if(EXISTS "${CASE_DIRECTORY}/test.ts")
+          add_test(NAME "e2e.typescript.tsc.${DIALECT_NAME}.${CASE_NAME}/test.ts"
+            COMMAND "${TSC_BIN}" --noEmit "${CASE_DIRECTORY}/test.ts")
+        endif()
       endif()
     endforeach()
   endif()