[test] adding member expression test for ter-indent

This test also revealed a misspelling in the test helper file.

Author: Manuel Lopez

src/test/rules/helper.ts

@@ -73,7 +73,7 @@ export function runScript(rule: string, scriptText: string, config: Object, erro
      ${scriptText}
      -------
 
-     Found ${failures.length} errors(s):
+     Found ${failures.length} error(s):
 
        ${errorMsgs.join('       ')}
     `;

src/test/rules/terIndentRuleTests.ts

@@ -30,6 +30,12 @@ function expectedErrors(errors: [[number, NumStr, NumStr]], indentType: string =
 const rule = 'ter-indent';
 const scripts: { valid: IScripts, invalid: IScripts } = {
   valid: [
+    {
+      code: Lint.Utils.dedent`
+        this.http.get('/')
+          .map(res => res.json())`,
+      options: [2, { MemberExpression: 1 }]
+    },
     {
       code: Lint.Utils.dedent`
         class MyComponent {