Commiting the primary key test, expecting a build failure.

tests/sql_primary_key_insert.rs

@@ -0,0 +1,41 @@
+use tokio_postgres::{SimpleQueryMessage, SimpleQueryRow};
+
+mod common;
+
+#[tokio::test]
+async fn primary_key_insert() -> Result<(), Box<dyn std::error::Error>> {
+    let (request_shutdown, client) = common::_create_server_and_client().await?;
+    client
+        .batch_execute(
+            "create table foo (
+            bar text not null primary key, 
+            baz text not null, 
+            another text null)",
+        )
+        .await?;
+
+    client
+        .batch_execute("insert into foo (bar, baz, another) values('one', 'two', 'three')")
+        .await?;
+
+    let rows = client
+        .simple_query("select bar, baz, another from foo;")
+        .await?;
+
+    let row_count = rows.into_iter().fold(0, |acc, x| -> usize {
+        if let SimpleQueryMessage::Row(_) = x {
+            return acc + 1;
+        } else {
+            acc
+        }
+    });
+
+    assert_eq!(row_count, 1);
+
+    let result = client
+        .batch_execute("insert into foo (bar, baz, another) values('one', 'two', 'three')")
+        .await;
+    assert!(result.is_err());
+
+    common::_request_shutdown(request_shutdown).await
+}