mockgres 0.0.29

An in-memory database that replicates a reasonable subset of Postgres functionality to make unit tests that rely on a database to run.
Documentation 
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mod common;

#[tokio::test(flavor = "multi_thread")]
async fn create_and_drop_index_noop() {
    let ctx = common::start().await;

    ctx.client
        .execute(
            "create table things(
                id int primary key,
                qty int not null,
                note text
            )",
            &[],
        )
        .await
        .expect("create table");

    ctx.client
        .execute("create index idx_things_qty on things (qty, id)", &[])
        .await
        .expect("create index");

    let dup_err = ctx
        .client
        .execute("create index idx_things_qty on things (qty)", &[])
        .await
        .expect_err("duplicate index create should fail");
    common::assert_db_error_contains(&dup_err, "already exists");

    ctx.client
        .execute(
            "create index if not exists idx_things_qty on things (qty)",
            &[],
        )
        .await
        .expect("idempotent create");

    ctx.client
        .execute("drop index idx_things_qty", &[])
        .await
        .expect("drop index");

    let drop_err = ctx
        .client
        .execute("drop index idx_things_qty", &[])
        .await
        .expect_err("second drop should error");
    common::assert_db_error_contains(&drop_err, "does not exist");

    ctx.client
        .execute("drop index if exists idx_things_qty", &[])
        .await
        .expect("drop if exists");

    let bad_col = ctx
        .client
        .execute("create index idx_things_missing on things (missing)", &[])
        .await
        .expect_err("unknown column should fail");
    common::assert_db_error_contains(&bad_col, "unknown column");

    let _ = ctx.shutdown.send(());
}

#[tokio::test(flavor = "multi_thread")]
async fn partial_unique_index_with_predicate_is_accepted() {
    let ctx = common::start().await;

    ctx.client
        .execute(
            "create table partial_idx(id int primary key, group_instance_id text)",
            &[],
        )
        .await
        .expect("create table");

    ctx.client
        .execute("create unique index idx_partial_group_instance on partial_idx (group_instance_id) where group_instance_id is not null", &[])
        .await
        .expect("create partial unique index");

    ctx.client
        .execute("drop index idx_partial_group_instance", &[])
        .await
        .expect("drop partial unique index");

    let _ = ctx.shutdown.send(());
}