Resolve #3257911 "Add tests"

Closes #3257911

added 2 commits

• 9fe2c97b - Test that resource schemas are generated.
• 2c52827f - Add tests for a basic Article node type.

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added 1 commit

• 34b91e60 - Add tests for a basic Article node type.

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added 1 commit

• 1a486ffa - Refactor $expected_resources so that it is not order dependent.

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added 1 commit

• 4a618962 - Enable field module in tests.

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added 7 commits

• 06c8f3e6 - Add tests for a basic Article node type.
• 5ae086c4 - Refactor $expected_resources so that it is not order dependent.
• 580af0a8 - Enable field module in tests.
• 0f819c55 - Test entity reference fields.
• f4f3ab6f - Test that required relationships are declared.
• 3e61520d - Test email fields.
• 522d0d90 - Test datetime fields.

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added 8 commits

• 509bcc71 - Test entity reference fields.
• a89cc128 - Test that required relationships are declared.
• b474d31d - Test email fields.
• 5464ce70 - Test datetime fields.
• 13b7f6aa - Move expected resource information to a member property.
• f73e0229 - Split tests up into separate methods.
• 8eb7c1a4 - Move general resource relationship tests to testJsonApiSchemaResources().
• 1381858c - Test that related schemas are generated.

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merged manually