Add test helper method

Author: gcatanese

modules/openapi-generator/src/test/java/org/openapitools/codegen/TestUtils.java

@@ -177,6 +177,31 @@ public static void assertFileContains(Path path, String... lines) {
         }
     }
 
+    /**
+     * Verify line is found at given lineNumber
+     * @param path
+     * @param lineNumber
+     * @param line
+     */
+    public static void assertFileContains(Path path, int lineNumber, String line) {
+        try {
+            List<String> linesInFile = Files.readAllLines(path);
+            int index = lineNumber - 1;
+
+            assertTrue(index >= 0 && index < linesInFile.size(),
+                    "Invalid line number: " + lineNumber);
+
+            String targetLine = linearize(linesInFile.get(index));
+            String expectedLine = linearize(line);
+
+            assertTrue(targetLine.contains(expectedLine),
+                    "Expected line [" + expectedLine + "] not found at line number " + lineNumber);
+
+        } catch (IOException e) {
+            fail("Unable to evaluate file " + path);
+        }
+    }
+
     public static String linearize(String target) {
         return target.replaceAll("\r?\n", "").replaceAll("\\s+", "\\s");
     }

modules/openapi-generator/src/test/java/org/openapitools/codegen/typescript/TypeScriptClientCodegenTest.java

@@ -229,6 +229,7 @@ public void testDeprecatedOperation() throws Exception {
         // verify operation is deprecated
         TestUtils.assertFileContains(
                 Paths.get(output + "/apis/DefaultApi.ts"),
+                18,
                 "* @deprecated"
         );
     }
@@ -251,6 +252,7 @@ public void testDeprecatedParameter() throws Exception {
         // verify parameter is deprecated parameter
         TestUtils.assertFileContains(
                 Paths.get(output + "/apis/DefaultApi.ts"),
+                20,
                 "* @param name name of pet  (@deprecated)"
         );
     }