test(reader): Prevent regression with empty files

Updated tests in reader_test.go to include checks for handling empty files in ParseContent function of reader package. Added tests to verify that ParseContent correctly returns an empty string when provided with an empty file path and a newline character string. This ensures consistent behavior and addresses potential issues highlighted in #31.

tests/reader/reader_test.go

@@ -104,7 +104,8 @@ func TestParseContent(t *testing.T) {
 		}
 
 		// Expected result when parsing an empty file
-		expected := "\n"
+		emptyString := ""
+		newlineString := "\n"
 
 		// Create a FileContentReader for the empty file
 		testReader := reader.FileContentReader{FilePath: emptyFile.Name()}
@@ -115,9 +116,12 @@ func TestParseContent(t *testing.T) {
 			t.Fatalf("Expected no error, got: %v", err)
 		}
 
-		// Verify the actual output matches the expected output
-		if actual != expected {
-			t.Errorf("Expected %s but got %s", expected, actual)
+		if actual != emptyString {
+			t.Error("When given an empty file returned something else.")
+		}
+
+		if actual == newlineString {
+			t.Error("When given empty file returned one with newline '\\n' character. See: https://github.com/supitsdu/clipper/issues/31#issue-2379691170")
 		}
 	})