Add test cases on BroadcastRule (#33482)

* Add test cases on BroadcastRule

* Add test cases on BroadcastRule

features/broadcast/core/src/test/java/org/apache/shardingsphere/broadcast/rule/BroadcastRuleTest.java

@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.broadcast.rule;
+
+import org.apache.shardingsphere.broadcast.config.BroadcastRuleConfiguration;
+import org.apache.shardingsphere.infra.rule.ShardingSphereRule;
+import org.apache.shardingsphere.infra.rule.attribute.RuleAttributes;
+import org.apache.shardingsphere.infra.rule.attribute.datasource.DataSourceMapperRuleAttribute;
+import org.apache.shardingsphere.test.fixture.jdbc.MockedDataSource;
+import org.junit.jupiter.api.Test;
+
+import javax.sql.DataSource;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class BroadcastRuleTest {
+
+    @Test
+    void assertGetDataSourceNames() {
+        BroadcastRule rule = new BroadcastRule(
+                new BroadcastRuleConfiguration(Collections.emptyList()), mockDataSourceMap(), Arrays.asList(mockBuiltRule(), mock(ShardingSphereRule.class, RETURNS_DEEP_STUBS)));
+        assertThat(rule.getDataSourceNames(), is(Collections.singletonList("foo_ds")));
+    }
+
+    private static Map<String, DataSource> mockDataSourceMap() {
+        Map<String, DataSource> result = new HashMap<>(2, 1F);
+        result.put("foo_ds_0", new MockedDataSource());
+        result.put("foo_ds_1", new MockedDataSource());
+        return result;
+    }
+
+    private ShardingSphereRule mockBuiltRule() {
+        DataSourceMapperRuleAttribute ruleAttribute = mock(DataSourceMapperRuleAttribute.class);
+        Map<String, Collection<String>> dataSourceMapper = new HashMap<>(2, 1F);
+        dataSourceMapper.put("foo_ds", Arrays.asList("foo_ds_0", "foo_ds_1"));
+        dataSourceMapper.put("bar_ds", Arrays.asList("bar_ds_0", "bar_ds_1"));
+        when(ruleAttribute.getDataSourceMapper()).thenReturn(dataSourceMapper);
+        ShardingSphereRule result = mock(ShardingSphereRule.class);
+        when(result.getAttributes()).thenReturn(new RuleAttributes(ruleAttribute));
+        return result;
+    }
+
+    @Test
+    void assertFilterBroadcastTableNames() {
+        BroadcastRule rule = new BroadcastRule(new BroadcastRuleConfiguration(Collections.singleton("foo_tbl")), Collections.emptyMap(), Collections.emptyList());
+        assertThat(rule.filterBroadcastTableNames(Arrays.asList("foo_tbl", "bar_tbl")), is(Collections.singleton("foo_tbl")));
+    }
+
+    @Test
+    void assertIsAllBroadcastTables() {
+        BroadcastRule rule = new BroadcastRule(new BroadcastRuleConfiguration(Collections.singleton("foo_tbl")), Collections.emptyMap(), Collections.emptyList());
+        assertFalse(rule.isAllBroadcastTables(Collections.emptyList()));
+        assertTrue(rule.isAllBroadcastTables(Collections.singleton("foo_tbl")));
+        assertFalse(rule.isAllBroadcastTables(Arrays.asList("foo_tbl", "bar_tbl")));
+    }
+
+    @Test
+    void assertIsAllBroadcastTablesWhenEmptyRule() {
+        BroadcastRule rule = new BroadcastRule(new BroadcastRuleConfiguration(Collections.emptyList()), Collections.emptyMap(), Collections.emptyList());
+        assertFalse(rule.isAllBroadcastTables(Collections.emptyList()));
+        assertFalse(rule.isAllBroadcastTables(Collections.singleton("foo_tbl")));
+        assertFalse(rule.isAllBroadcastTables(Arrays.asList("foo_tbl", "bar_tbl")));
+    }
+}