Add unit tests

Author: ashtanko

README.md

@@ -22,21 +22,21 @@
 
 ### Metrics
 ```text
-15050 number of properties
-10451 number of functions
-8905 number of classes
+15055 number of properties
+10456 number of functions
+8907 number of classes
 235 number of packages
 3514 number of kt files
 ```
 
 
 ### Complexity Report
 ```text
-265695 lines of code (loc)
-164962 source lines of code (sloc)
-120475 logical lines of code (lloc)
+265730 lines of code (loc)
+164992 source lines of code (sloc)
+120498 logical lines of code (lloc)
 72531 comment lines of code (cloc)
-24870 cyclomatic complexity (mcc)
+24875 cyclomatic complexity (mcc)
 20331 cognitive complexity
 0 number of total code smells
 43 comment source ratio

src/test/kotlin/dev/shtanko/truth/TruthExampleTest.kt

@@ -25,4 +25,39 @@ class TruthExampleTest {
         val result = 2 + 2
         assertThat(result).isEqualTo(4)
     }
+
+    @Test
+    fun testStrings() {
+        val message = "Hello, Truth!"
+        assertThat(message).contains("Truth")
+    }
+}
+
+class CollectionTruthTest {
+    @Test
+    fun testListContents() {
+        val fruits = listOf("apple", "banana", "orange")
+        assertThat(fruits).containsExactly("banana", "orange", "apple")
+    }
+
+    @Test
+    fun testMapContents() {
+        val map = mapOf("kotlin" to 2.2, "java" to 21)
+        assertThat(map).containsEntry("kotlin", 2.2)
+        assertThat(map).doesNotContainKey("scala")
+    }
+}
+
+class NullableTruthTest {
+    @Test
+    fun testNullValues() {
+        val name: String? = null
+        assertThat(name).isNull()
+    }
+
+    @Test
+    fun testNonNull() {
+        val language: String? = "Kotlin"
+        assertThat(language).isNotNull()
+    }
 }