create dotenv java tests

src/test/java/tests/JavaTests.java

@@ -0,0 +1,39 @@
+package tests;
+
+import io.github.cdimascio.dotenv.DotEnvException;
+import io.github.cdimascio.dotenv.Dotenv;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+public class JavaTests {
+    @Test(expected = DotEnvException.class)
+    public void throwIfMalconfigured() {
+        Dotenv.configure().load();
+    }
+
+    @Test(expected = DotEnvException.class)
+    public void load() {
+        Dotenv dotenv = Dotenv.load();
+        assertEquals("my test ev 1", dotenv.get("MY_TEST_EV1"));
+    }
+
+    @Test
+    public void configurWithIgnoreMalformed() {
+        Dotenv dotenv = Dotenv.configure()
+                .ignoreIfMalformed()
+                .load();
+        assertEquals("my test ev 1", dotenv.get("MY_TEST_EV1"));
+    }
+
+    @Test
+    public void configurWithIgnoreMissingAndMalformed() {
+        Dotenv dotenv = Dotenv.configure()
+                .directory("/missing/dir")
+                .ignoreIfMalformed()
+                .ignoreIfMissing()
+                .load();
+        assertNotNull(dotenv.get("HOME"));
+    }
+}