build(aio): truncate API overview parameters at one line

aio/tools/transforms/angular-base-package/rendering/truncateCode.spec.js

@@ -0,0 +1,35 @@
+var factory = require('./truncateCode');
+
+describe('truncateCode filter', function() {
+  var filter;
+
+  beforeEach(function() { filter = factory(); });
+
+  it('should be called "truncateCode"',
+     function() { expect(filter.name).toEqual('truncateCode'); });
+
+  it('should return the whole string given lines is undefined', function() {
+    expect(filter.process('some text\n  \nmore text\n  \n'))
+      .toEqual('some text\n  \nmore text\n  \n');
+  });
+
+  it('should return the whole string if less than the given number of lines', function() {
+    expect(filter.process('this is a pretty long string that only exists on one line', 1))
+      .toEqual('this is a pretty long string that only exists on one line');
+
+    expect(filter.process('this is a pretty long string\nthat exists on two lines', 2))
+      .toEqual('this is a pretty long string\nthat exists on two lines');
+  });
+
+  it('should return the specified number of lines and an ellipsis if there are more lines', function() {
+    expect(filter.process('some text\n  \nmore text\n  \n', 1)).toEqual('some text...');
+  });
+
+  it('should add closing brackets for all the unclosed opening brackets after truncating', function() {
+    expect(filter.process('()[]{}\nsecond line', 1)).toEqual('()[]{}...');
+    expect(filter.process('([]{}\nsecond line', 1)).toEqual('([]{}...)');
+    expect(filter.process('()[{}\nsecond line', 1)).toEqual('()[{}...]');
+    expect(filter.process('()[]{\nsecond line', 1)).toEqual('()[]{...}');
+    expect(filter.process('([{\nsecond line', 1)).toEqual('([{...}])');
+  });
+});