test: add test

feature-flag/src/test/java/com/navercorp/pinpoint/featureflag/provider/FeatureFlagServiceProviderImplTest.java

@@ -0,0 +1,35 @@
+package com.navercorp.pinpoint.featureflag.provider;
+
+import com.navercorp.pinpoint.featureflag.config.FeatureFlagProperties;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class FeatureFlagServiceProviderImplTest {
+    static final String FEATURE_NAME = "feature";
+
+    static FeatureFlagServiceProviderImpl buildProvider(Boolean enabled, List<String> enabledFor, List<String> disabledFor) {
+        FeatureFlagProperties properties = new FeatureFlagProperties();
+        properties.put(FEATURE_NAME, new FeatureFlagProperties.Feature(enabled, enabledFor, disabledFor));
+        return new FeatureFlagServiceProviderImpl(properties);
+    }
+
+    @Test
+    void defaultEnabled() {
+        FeatureFlagServiceProviderImpl sut = buildProvider(null, null, null);
+
+        assertTrue(sut.get(FEATURE_NAME).isEnabled("app"));
+        assertTrue(sut.get("other").isEnabled("app"));
+    }
+
+    @Test
+    void enabledFor() {
+        FeatureFlagServiceProviderImpl sut = buildProvider(null, List.of("app"), null);
+
+        assertTrue(sut.get(FEATURE_NAME).isEnabled("app"));
+        assertFalse(sut.get(FEATURE_NAME).isEnabled("other"));
+    }
+}