tests(po): add new test case to test po files that dont have a msgctxt

src/Ashampoo.Translation.Systems.Formats.PO/tests/FormatTest.cs

@@ -68,6 +68,41 @@ public void CreateBuilderWithDisabledPipeSplittingTest()
         result.Should().NotContain("msgctxt ");
     }
 
+    [Fact]
+    public void ReadWithoutMsgCtxtText()
+    {
+        var format = CreateAndReadFromFile("test.po",
+            new FormatReadOptions { SourceLanguage = new Language("en-US") });
+
+        var poHeader = format.Header as POHeader;
+        poHeader.Should().NotBeNull();
+
+        format.TranslationUnits.Count.Should().Be(2);
+        format.Header.TargetLanguage.Should().Be(new Language("de-DE"));
+
+        const string id = "testid2";
+
+        format.TranslationUnits.GetTranslationUnit(id).Translations.GetTranslation(new Language("de-DE")).Value.Should()
+            .Be("deutscher testid2 Text");
+    }
+
+    [Fact]
+    public async Task ReadAndWriteWithoutMsgCtxtText()
+    {
+        var format = await CreateAndReadFromFileAsync("test.po",
+            new FormatReadOptions { SourceLanguage = new Language("en-US") });
+
+        var outStream = new MemoryStream();
+        await format.WriteAsync(outStream);
+        await outStream.FlushAsync();
+        outStream.Seek(0, SeekOrigin.Begin);
+
+        var reader = new StreamReader(outStream);
+        var result = await reader.ReadToEndAsync();
+        result.Should().NotBeEmpty();
+        result.Should().NotContain("msgctxt ");
+    }
+
     [Fact]
     public async Task ReadAndWriteAsync()
     {

src/Ashampoo.Translation.Systems.Formats.PO/tests/_TestFiles_/test.po

@@ -0,0 +1,9 @@
+msgid ""
+msgstr ""
+"Language: de-DE\n"
+
+msgid "testid1"
+msgstr "deutscher testid1 Text"
+
+msgid "testid2"
+msgstr "deutscher testid2 Text"