describe("Provider module", function()
    local Provider
    local t

    setup(function()
        require("commonrequire")
        Provider = require("provider")
    end)

    it("should fail to register an improper provider", function()
        assert.is_false(Provider:register())
    end)
    it("should fail to unregister an improper provider", function()
        assert.is_false(Provider:unregister())
    end)
    it("should register a proper provider with empty implementation", function()
        assert.is_true(Provider:register("exporter", "test", {}))
    end)
    it("should override an implementation for the same name of the same kind", function()
        assert.is_true(Provider:register("exporter", "test", { test  = function() end }))
        assert.is_true(type(Provider.features["exporter"]["test"].test) == "function")
    end)
    it("should unregister a provider", function()
        assert.is_true(Provider:unregister("exporter", "test"))
    end)
    it("should count providers for a specific feature", function()
        assert.is_true(Provider:register("exporter", "test1", {}))
        assert.is_true(Provider:register("exporter", "test2", {}))
        assert.is_true(Provider:register("exporter", "test3", {}))
        assert.is_true(Provider:size("exporter") == 3)
    end)

    it("should dump a table of providers for a specific feature", function()
        assert.are.same(Provider.features["exporter"],
            Provider:getProvidersTable("exporter"))
    end)
    it("should dump an empty table for an invalid feature", function()
        t = Provider:getProvidersTable("invalid")
        assert.is_true(type(t) == "table")
    end)
end)