Prove string concat behavior with a unit test

tom-englert · tom-englert · commit 5e8387b1187e · 2022-01-23T17:24:19.000+01:00
diff --git a/src/ResXManager.Tests/UnitTest1.cs b/src/ResXManager.Tests/UnitTest1.cs
@@ -52,5 +52,17 @@ public void ResourceTableEntryRuleStringFormatTest(string neutral, string[] spec
                 Assert.Equal(expectedMessage, message);
             }
         }
+
+        [Fact]
+        public void StringConcatBehavior()
+        {
+            const string? s1 = default;
+            const string? s2 = default;
+            const string s3 = "Test";
+
+            Assert.Equal(string.Empty, s1 + s2);
+            Assert.Equal(s3, s1 + s3);
+            Assert.Equal(s3, s1 + s3 + s2);
+        }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -52,5 +52,17 @@ public void ResourceTableEntryRuleStringFormatTest(string neutral, string[] spec`
`52`	`52`	`Assert.Equal(expectedMessage, message);`
`53`	`53`	`}`
`54`	`54`	`}`
	`55`	`+`
	`56`	`+ [Fact]`
	`57`	`+ public void StringConcatBehavior()`
	`58`	`+ {`
	`59`	`+ const string? s1 = default;`
	`60`	`+ const string? s2 = default;`
	`61`	`+ const string s3 = "Test";`
	`62`	`+`
	`63`	`+ Assert.Equal(string.Empty, s1 + s2);`
	`64`	`+ Assert.Equal(s3, s1 + s3);`
	`65`	`+ Assert.Equal(s3, s1 + s3 + s2);`
	`66`	`+ }`
`55`	`67`	`}`
`56`	`68`	`}`