Smoke test that things still work after “closeOpenConnections”

src/objective-c/tests/InteropTests.m

@@ -35,6 +35,7 @@
 
 #include <grpc/status.h>
 
+#import <GRPCClient/GRPCCall+ChannelArg.h>
 #import <GRPCClient/GRPCCall+Tests.h>
 #import <ProtoRPC/ProtoRPC.h>
 #import <RemoteTest/Empty.pbobjc.h>
@@ -312,4 +313,25 @@
   [self waitForExpectationsWithTimeout:8 handler:nil];
 }
 
+- (void)testRPCAfterClosingOpenConnections {
+  XCTAssertNotNil(self.class.host);
+  __weak XCTestExpectation *expectation =
+      [self expectationWithDescription:@"RPC after closing connection"];
+
+  RMTEmpty *request = [RMTEmpty message];
+
+  [_service emptyCallWithRequest:request handler:^(RMTEmpty *response, NSError *error) {
+    XCTAssertNil(error, @"First RPC finished with unexpected error: %@", error);
+
+    [GRPCCall closeOpenConnections];
+
+    [_service emptyCallWithRequest:request handler:^(RMTEmpty *response, NSError *error) {
+      XCTAssertNil(error, @"Second RPC finished with unexpected error: %@", error);
+      [expectation fulfill];
+    }];
+  }];
+
+  [self waitForExpectationsWithTimeout:4 handler:nil];
+}
+
 @end