diff --git a/tests/service.parser.spec.ts b/tests/service.parser.spec.ts
new file mode 100644
index 0000000..a5db5f6
--- /dev/null
+++ b/tests/service.parser.spec.ts
@@ -0,0 +1,80 @@
+import { expect } from 'chai';
+
+import { ServiceParser } from '../src/parsers/service.parser';
+
+class TestServiceParser extends ServiceParser {
+
+	public extractTranslateServiceVar(contents: string): string {
+		return this._extractTranslateServiceVar(contents);
+	}
+
+}
+
+describe('ServiceParser', () => {
+
+	const componentFilename: string = 'test.component.ts';
+
+	let parser: TestServiceParser;
+
+	beforeEach(() => {
+		parser = new TestServiceParser();
+	});
+
+	it('should extract variable used for TranslateService', () => {
+		const contents = `
+			@Component({ })
+			export class AppComponent {
+				public constructor(
+					_serviceA: ServiceA,
+					public _serviceB: ServiceB,
+					protected _translateService: TranslateService
+			) { }
+		`;
+		const messages = parser.extractTranslateServiceVar(contents);
+		expect(messages).to.equal('_translateService');
+	});
+
+	it('should extract string passed to translateService.get()', () => {
+		const contents = `
+			@Component({ })
+			export class AppComponent {
+				public constructor(protected _translateService: TranslateService) { }
+				public test() {
+					this._translateService.get('Hello World');
+				}
+		`;
+		const messages = parser.process(componentFilename, contents);
+		expect(messages).to.deep.equal(['Hello World']);
+	});
+
+	it('should extract string passed to translateService.instant()', () => {
+		const contents = `
+			@Component({ })
+			export class AppComponent {
+				public constructor(protected _translateService: TranslateService) { }
+				public test() {
+					this._translateService.instant('Hello World');
+				}
+		`;
+		const messages = parser.process(componentFilename, contents);
+		expect(messages).to.deep.equal(['Hello World']);
+	});
+
+	it('should not extract string passed to get() or instant() methods of other services', () => {
+		const contents = `
+			@Component({ })
+			export class AppComponent {
+				public constructor(
+					protected _translateService: TranslateService,
+					protected _otherService: OtherService
+				) { }
+				public test() {
+					this._otherService.get('Hello World');
+					this._otherService.instant('Hi there');
+				}
+		`;
+		const messages = parser.process(componentFilename, contents);
+		expect(messages).to.deep.equal([]);
+	});
+
+});