Add Contains chainer and others!

Adds the following chainers:

• Contains - allows checking if a string, list, or array contains something
• DoesNotContain - allows checking if a string, list, or array does not contain something
• IsNotNil - to use when you need to ensure something isn't nil
• IsNotEmpty - to use when you need to ensure something isn't empty

Minor changes to match CLI release

Updates references in this package to match changes from the Ensure CLI v0.1.4 release.

Pretty print actual and expected

Actual and expected are now pretty printed when they are not equal. Strings are quoted, so their formatting doesn't impact the test output. These changes make it easier to tell why a particular equality test is failing.

NEW mock features

Adds the following features to mocks:

• Supports embedding structs in Mock struct for sharing groups of mocks between tests (#30)
• Allows defining the NEW method without parameters for building simple pass-through mocks (#31)
• Allows tagging mock fields to be ignored if unused (#32)

See the example in the README for usage.

Support mocks in table driven tests

Mocks are now supported in table driven tests. See the README for an example.

Interface polish with small breaking changes

Breaking changes:

• Requires Go 1.14+

• Removes Fail() method, and replaces it with Failf(<msg>)

• Everything now uses Fatalf instead of Errorf, so tests fail immediately if something goes wrong

• Fails tests if ensure(...) is called and is missing chained assertions. For example:

  ensure(true) // Fails

Add IsEmpty() chained method

Now supports checking for empty arrays, slices, strings, and maps with IsEmpty(). For example:

ensure([]string{}).IsEmpty()

Fix using imported package and add IsNil()

Now importing the package should not panic. Adds IsNil() chained method.

Fix import errors

Not committing the mocks caused package import errors.

Initial Release

Support for basic testing.