test: NBP service test outline

src/test/java/eu/ztsh/wymiana/service/NbpServiceTest.java

@@ -0,0 +1,32 @@
+package eu.ztsh.wymiana.service;
+
+import org.junit.jupiter.api.Test;
+
+class NbpServiceTest {
+
+    @Test
+    void getFetchDateOnWorkingDayTest() {
+
+    }
+
+    @Test
+    void getFetchDateOnWeekendTest() {
+
+    }
+
+    @Test
+    void getWithoutCacheTest() {
+
+    }
+
+    @Test
+    void getWithCacheTest() {
+
+    }
+
+    @Test
+    void getInvalidCurrencyTest() {
+
+    }
+
+}