diff --git a/__tests__/parsEnvironmentFileString.test.js b/__tests__/parsEnvironmentFileString.test.js
index 17c5c1c..8f5367d 100644
--- a/__tests__/parsEnvironmentFileString.test.js
+++ b/__tests__/parsEnvironmentFileString.test.js
@@ -15,3 +15,56 @@ describe('test filterEmptyLines', () => {
         expect(typeof array).toEqual('object');
     });
 });
+
+describe('test parseEnvironmentFileString', () => {
+    test('test "=" in value', () => {
+        const env = parseEnvironmentFileString('TEST=YG==');
+        expect(env.TEST).toEqual('YG==');
+    });
+    test('test quotation marks "\'\'"', () => {
+        const env = parseEnvironmentFileString('TEST="\'Some Text\'"');
+        expect(env.TEST).toEqual("'Some Text'");
+    });
+    test('test quotation marks \'""\'', () => {
+        const env = parseEnvironmentFileString('TEST=\'"Some Text"\'');
+        expect(env.TEST).toEqual('"Some Text"');
+    });
+    test('test explicit line break', () => {
+        const env = parseEnvironmentFileString('TEST=Some Text\\nMore Text');
+        expect(env.TEST).toEqual('Some Text\nMore Text');
+    });
+    test('test double backslash', () => {
+        const env = parseEnvironmentFileString('TEST=Some Text\\\\More Text');
+        expect(env.TEST).toEqual('Some Text\\More Text');
+    });
+    test('test eol \\n', () => {
+        const env = parseEnvironmentFileString('TEST=Some Text\nTEST2=More Text');
+        expect(env.TEST).toEqual('Some Text'); 
+        expect(env.TEST2).toEqual('More Text');
+    })
+    test('test eol \\r\\n', () => {
+        const env = parseEnvironmentFileString('TEST=Some Text\r\nTEST2=More Text');
+        expect(env.TEST).toEqual('Some Text'); 
+        expect(env.TEST2).toEqual('More Text');
+    })
+    test('test value with #', () => {
+        const env = parseEnvironmentFileString('TEST=Some Text#More Text');
+        expect(env.TEST).toEqual('Some Text#More Text');
+    });
+    test('test lowercase variable names', () => {
+        const env = parseEnvironmentFileString('test=Some Text');
+        expect(env.test).toEqual('Some Text');
+    });
+    test('test lowercase variable name replacement', () => {
+        const env = parseEnvironmentFileString('testing=def\ntest=abc${testing}');
+        expect(env.test).toEqual("abcdef");
+    });
+    test('test uppercase variable name replacement', () => {
+        const env = parseEnvironmentFileString('TESTING=def\ntest=abc${TESTING}');
+        expect(env.test).toEqual("abcdef");
+    });
+    test('test allow numbers in variable name', () => {
+        const env = parseEnvironmentFileString('TESTING123=def\ntest=abc${TESTING123}');
+        expect(env.test).toEqual("abcdef");
+    });
+});