100% in branching is not achieved in istanbul code coverage

[RoopanV]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request

Versions.

"@angular/animations": "^4.0.0",
"@angular/common": "^4.0.0",
"@angular/compiler": "^4.0.0",
"@angular/core": "^4.0.0",
"@angular/forms": "^4.0.0",
"@angular/http": "^4.0.0",
"@angular/platform-browser": "^4.0.0",
"@angular/platform-browser-dynamic": "^4.0.0",
"@angular/router": "^4.0.0",
"bootstrap": "^3.3.7",
"core-js": "^2.4.1",
"jquery": "^3.2.1",
"ng2-datetime": "^1.4.0",
"rxjs": "^5.1.0",
"zone.js": "^0.8.4"

Repro steps.

When i am running ng test --code-coverage i am not getting branches covered 100% because of not covering constructor fully.

The log given by the failure.

Desired functionality.

Mention any other details that might be useful.

[devoto13]

Possible duplicate of #5526.

[filipesilva]

Closing as per @devoto13's comment.

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