#2 add MainKtTest

src/main/kotlin/GoogleSheetSupplier.kt

@@ -21,7 +21,7 @@ class GoogleSheetSupplier(
 
     override fun get(): List<Postcrosser> {
         // Authenticate using the service account
-        val textCredential = System.getProperty("GOOGLE_SHEETS_CRED")
+        val textCredential = System.getenv("GOOGLE_SHEETS_CRED")
         val credential = GoogleCredential.fromStream(stringToInputStream(textCredential))
             .createScoped(listOf("https://www.googleapis.com/auth/spreadsheets.readonly"))
 

src/test/kotlin/MainKtTest.kt

@@ -0,0 +1,19 @@
+import com.akryvtsun.isToday
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import java.time.LocalDate
+
+class MainKtTest {
+
+    @Test
+    fun `should be equal to todays date`() {
+        val today = LocalDate.now()
+        assertThat(isToday(today)).isTrue()
+    }
+
+    @Test
+    fun `shouldn't be equal to todays date`() {
+        val tomorrow = LocalDate.now().plusDays(1)
+        assertThat(isToday(tomorrow)).isFalse()
+    }
+}