diff --git a/Diagnostics.xcodeproj/project.pbxproj b/Diagnostics.xcodeproj/project.pbxproj
index 322da66..c9eb888 100644
--- a/Diagnostics.xcodeproj/project.pbxproj
+++ b/Diagnostics.xcodeproj/project.pbxproj
@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		416CE0182406D85F00698E0A /* HTMLEncoding.swift in Sources */ = {isa = PBXBuildFile; fileRef = 416CE0172406D85F00698E0A /* HTMLEncoding.swift */; };
+		416CE0D0241FA65700698E0A /* HTMLEncodingTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 416CE0CF241FA65700698E0A /* HTMLEncodingTests.swift */; };
 		500B2756239524E100C304D4 /* Diagnostics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 500B274C239524E100C304D4 /* Diagnostics.framework */; };
 		500B275D239524E100C304D4 /* Diagnostics.h in Headers */ = {isa = PBXBuildFile; fileRef = 500B274F239524E100C304D4 /* Diagnostics.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		500B276823953E4100C304D4 /* DiagnosticsReporter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 500B276723953E4100C304D4 /* DiagnosticsReporter.swift */; };
@@ -46,6 +47,7 @@
 
 /* Begin PBXFileReference section */
 		416CE0172406D85F00698E0A /* HTMLEncoding.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HTMLEncoding.swift; sourceTree = "<group>"; };
+		416CE0CF241FA65700698E0A /* HTMLEncodingTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HTMLEncodingTests.swift; sourceTree = "<group>"; };
 		500B274C239524E100C304D4 /* Diagnostics.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Diagnostics.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		500B274F239524E100C304D4 /* Diagnostics.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = Diagnostics.h; sourceTree = "<group>"; };
 		500B2750239524E100C304D4 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -135,6 +137,7 @@
 				509F59322396920E006AD8D1 /* Extensions */,
 				509F5935239694A0006AD8D1 /* Reporters */,
 				500B27AD2395528100C304D4 /* DiagnosticsReporterTests.swift */,
+				416CE0CF241FA65700698E0A /* HTMLEncodingTests.swift */,
 				500B27B12395553000C304D4 /* HTMLGeneratingTests.swift */,
 				500B275C239524E100C304D4 /* Info.plist */,
 				500B27C923968CA900C304D4 /* Mocks.swift */,
@@ -317,7 +320,7 @@
 /* Begin PBXShellScriptBuildPhase section */
 		500B27C723959EB500C304D4 /* SwiftLint */ = {
 			isa = PBXShellScriptBuildPhase;
-			buildActionMask = 2147483647;
+			buildActionMask = 12;
 			files = (
 			);
 			inputFileListPaths = (
@@ -362,6 +365,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				416CE0D0241FA65700698E0A /* HTMLEncodingTests.swift in Sources */,
 				500B27B22395553000C304D4 /* HTMLGeneratingTests.swift in Sources */,
 				509F59392396973F006AD8D1 /* UserDefaultsReporterTests.swift in Sources */,
 				500B27CA23968CA900C304D4 /* Mocks.swift in Sources */,
diff --git a/DiagnosticsTests/HTMLEncodingTests.swift b/DiagnosticsTests/HTMLEncodingTests.swift
new file mode 100644
index 0000000..c5e0e65
--- /dev/null
+++ b/DiagnosticsTests/HTMLEncodingTests.swift
@@ -0,0 +1,21 @@
+//
+//  HTMLEncodingTests.swift
+//  DiagnosticsTests
+//
+//  Created by David Steppenbeck on 2020/03/16.
+//  Copyright © 2020 WeTransfer. All rights reserved.
+//
+
+import XCTest
+@testable import Diagnostics
+
+final class HTMLEncodingTests: XCTestCase {
+
+    /// It should correctly transform a String to HTML.
+    func testAddingHTMLEncoding() {
+        let value = "<CONTENT>"
+        let expectedHTML = "&lt;CONTENT&gt;"
+        XCTAssertEqual(value.addingHTMLEncoding(), expectedHTML)
+    }
+
+}