mtest

t := &testing.T{}
someCollection := &mongo.Collection{}

// Prepare pre-condition with Condition.
For(t, someCollection).Condition().
	Empty().
	Exists(bson.M{"name": "Alice", "age": 22})

// Some manipulation on the document ...

// Check post-condition with Assert.
For(t, someCollection).Assert().
	Exists(bson.M{"name": "Alice", "age": 24}).
	NotExists(bson.M{"name": "Bob"})

// Can also use Golang struct for checking clause
type Person struct {
	Name string `bson:"name"`
	Age  int    `bson:"age"`
}
For(t, someCollection).Assert().
	Exists(Person{Name: "Alice", Age: 22})

// Use "From" helper to get collection if we only have the client object
client, _ := mongo.NewClient()
For(t, From(client, "company", "person")).Condition().
	Empty().
	Exists(bson.M{"name": "Alice", "age": 22})

// Use "OfId" helper to get a filter for some document ID
For(t, From(client, "company", "person")).Condition().
	Empty().
	NotExists(OfId("some-id"))

Output:

t := &testing.T{}
client, _ := mongo.NewClient()

// First part of logic being testing ...

// Check the post-condition and return immediately
// if the condition doesn't meet the requirement
For(t, From(client, "company", "person")).Require().
	NotExists(bson.M{"name": "Alice", "age": 24})

// Second part of logic being testing ...

For(t, From(client, "company", "person")).Require().
	Exists(bson.M{"name": "Alice", "age": 24})

Output:

t := &testing.T{}
client, _ := mongo.NewClient()

// Batch insert logic ...

// Can check multiple document at once.
For(t, From(client, "company", "person")).Assert().
	Exists(
		bson.M{"name": "Alice", "age": 24},
		bson.M{"name": "Bob", "age": 16},
		bson.M{"name": "Charlie", "age": 53},
	)

// Another checking style.
For(t, From(client, "company", "person")).Assert().
	Exists(bson.M{"name": "Alice", "age": 24}).
	Exists(bson.M{"name": "Bob", "age": 16}).
	Exists(bson.M{"name": "Charlie", "age": 53})

Output:

t := &testing.T{}
client, _ := mongo.NewClient()

// Cleanup the collection and insert one document.
For(t, From(client, "company", "person")).Condition().
	Empty().
	Exists(bson.M{"name": "Alice", "age": 22})

// Delete the document ...

// Check post-condition with Assert.
For(t, From(client, "company", "person")).Assert().
	NotExists(bson.M{"name": "Alice", "age": 24})

// If we need to check the collection is indeed cleaned up.
For(t, From(client, "company", "person")).Assert().
	Empty()

Output: