add tests for titlecaseFirst extension function in StringUtilsTest

Author: 314systems

app/src/test/kotlin/com/vrem/util/StringUtilsTest.kt

@@ -44,6 +44,38 @@ class StringUtilsTest {
         assertThat(actual).isEqualTo(expected)
     }
 
+    @Test
+    fun titlecaseFirst() {
+        // setup
+        val expected = "Value"
+        val value = "value"
+        // execute
+        val actual: String = value.titlecaseFirst(Locale.US)
+        // verify
+        assertThat(actual).isEqualTo(expected)
+    }
+
+    @Test
+    fun titlecaseFirstWithEmptyString() {
+        // setup
+        val value = ""
+        // execute
+        val actual: String = value.titlecaseFirst(Locale.US)
+        // verify
+        assertThat(actual).isEmpty()
+    }
+
+    @Test
+    fun titlecaseFirstWithAlreadyTitlecase() {
+        // setup
+        val expected = "Value"
+        val value = "Value"
+        // execute
+        val actual: String = value.titlecaseFirst(Locale.US)
+        // verify
+        assertThat(actual).isEqualTo(expected)
+    }
+
     @Test
     fun nullToEmptyWhenNull() {
         // setup