nitunit: teach test_suite to compare outputs with a saved result file

[nit.git] / src / testing / testing_suite.nit

# This file is part of NIT ( http://www.nitlanguage.org ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Testing from external files.
module testing_suite

import testing_base
import html
private import annotation

redef class ToolContext
        # -- target-file
        var opt_file = new OptionString("Specify test suite location", "-t", "--target-file")
        # --pattern
        var opt_pattern = new OptionString("Only run test case with name that match pattern", "-p", "--pattern")
end

# Used to test nitunit test files.
class NitUnitTester

        # `ModelBuilder` used to parse test files.
        var mbuilder: ModelBuilder

        # Parse a file and return the contained `MModule`.
        private fun parse_module_unit(file: String): nullable MModule do
                var mmodule = mbuilder.parse([file]).first
                if mbuilder.get_mmodule_annotation("test_suite", mmodule) == null then return null
                mbuilder.run_phases
                return mmodule
        end

        # Compile and execute the test suite for a NitUnit `file`.
        fun test_module_unit(file: String): nullable TestSuite do
                var toolcontext = mbuilder.toolcontext
                var mmodule = parse_module_unit(file)
                # is the module a test_suite?
                if mmodule == null then return null
                var suite = new TestSuite(mmodule, toolcontext)
                # method to execute before all tests in the module
                var before_module = mmodule.before_test
                if before_module != null then
                        toolcontext.modelbuilder.total_tests += 1
                        suite.before_module = new TestCase(suite, before_module, toolcontext)
                end
                # generate all test cases
                for mclassdef in mmodule.mclassdefs do
                        if not mclassdef.is_test then continue
                        if not suite_match_pattern(mclassdef) then continue
                        toolcontext.modelbuilder.total_classes += 1
                        for mpropdef in mclassdef.mpropdefs do
                                if not mpropdef isa MMethodDef or not mpropdef.is_test then continue
                                if not case_match_pattern(mpropdef) then continue
                                toolcontext.modelbuilder.total_tests += 1
                                var test = new TestCase(suite, mpropdef, toolcontext)
                                suite.add_test test
                        end
                end
                # method to execute after all tests in the module
                var after_module = mmodule.after_test
                if after_module != null then
                        toolcontext.modelbuilder.total_tests += 1
                        suite.after_module = new TestCase(suite, after_module, toolcontext)
                end
                suite.run
                return suite
        end

        # Is the test suite name match the pattern option?
        private fun suite_match_pattern(suite: MClassDef): Bool do
                var pattern = mbuilder.toolcontext.opt_pattern.value
                if pattern == null then return true
                var ps = pattern.split_with("::")
                var p = ps.first
                if ps.length == 1 and p.first.is_lower then return true
                if ps.length == 2 and p.first.is_lower then return false
                if p.has_suffix("*") then
                        p = p.substring(0, p.length - 1)
                        if suite.name.has_prefix(p) then return true
                else
                        if suite.name == p then return true
                end
                return false
        end

        # Is the test case name match the pattern option?
        private fun case_match_pattern(case: MPropDef): Bool do
                var pattern = mbuilder.toolcontext.opt_pattern.value
                if pattern == null then return true
                var ps = pattern.split_with("::")
                var p = ps.last
                if ps.length == 1 and p.first.is_upper then return true
                if ps.length == 2 and p.first.is_upper then return false
                if p.has_suffix("*") then
                        p = p.substring(0, p.length - 1)
                        if case.name.has_prefix(p) then return true
                else
                        if case.name == p then return true
                end
                return false
        end
end

# A test suite contains all the test cases for a `MModule`.
class TestSuite

        # `MModule` under test
        var mmodule: MModule

        # `ToolContext` to use to display messages.
        var toolcontext: ToolContext

        # List of `TestCase` to be executed in this suite.
        var test_cases = new Array[TestCase]

        # Add a `TestCase` to the suite.
        fun add_test(case: TestCase) do test_cases.add case

        # Test to be executed before the whole test suite.
        var before_module: nullable TestCase = null

        # Test to be executed after the whole test suite.
        var after_module: nullable TestCase = null

        # Execute the test suite
        fun run do
                if not toolcontext.test_dir.file_exists then
                        toolcontext.test_dir.mkdir
                end
                write_to_nit
                compile
                toolcontext.info("Execute test-suite {mmodule.name}", 1)
                var before_module = self.before_module
                if not before_module == null then before_module.run
                for case in test_cases do case.run
                var after_module = self.after_module
                if not after_module == null then after_module.run
        end

        # Write the test unit for `self` in a nit compilable file.
        fun write_to_nit do
                var file = new Template
                file.addn "intrude import test_suite"
                file.addn "import {mmodule.name}\n"
                file.addn "var name = args.first"
                for case in test_cases do
                        case.write_to_nit(file)
                end
                file.write_to_file("{test_file}.nit")
        end

        # Return the test suite in XML format compatible with Jenkins.
        # Contents depends on the `run` execution.
        fun to_xml: HTMLTag do
                var n = new HTMLTag("testsuite")
                n.attr("package", mmodule.name)
                var failure = self.failure
                if failure != null then
                        var f = new HTMLTag("failure")
                        f.attr("message", failure.to_s)
                        n.add f
                else
                        for test in test_cases do n.add test.to_xml
                end
                return n
        end

        # Generated test file name.
        fun test_file: String do
                return toolcontext.test_dir / "gen_{mmodule.name.escape_to_c}"
        end

        # Compile all `test_cases` cases in one file.
        fun compile do
                # find nitc
                var nitc = toolcontext.find_nitc
                # compile test suite
                var file = test_file
                var module_file = mmodule.location.file
                if module_file == null then
                        toolcontext.error(null, "Error: cannot find module file for {mmodule.name}.")
                        toolcontext.check_errors
                        return
                end
                var include_dir = module_file.filename.dirname
                var cmd = "{nitc} --no-color '{file}.nit' -I {include_dir} -o '{file}.bin' > '{file}.out' 2>&1 </dev/null"
                var res = toolcontext.safe_exec(cmd)
                var f = new FileReader.open("{file}.out")
                var msg = f.read_all
                f.close
                # set test case result
                var loc = mmodule.location
                if res != 0 then
                        failure = msg
                        toolcontext.warning(loc, "failure", "FAILURE: {mmodule.name} (in file {file}.nit): {msg}")
                        toolcontext.modelbuilder.failed_tests += 1
                end
                toolcontext.check_errors
        end

        # Error occured during test-suite compilation.
        var failure: nullable String = null
end

# A test case is a unit test considering only a `MMethodDef`.
class TestCase

        # Test suite wich `self` belongs to.
        var test_suite: TestSuite

        # Test method to be compiled and tested.
        var test_method: MMethodDef

        # `ToolContext` to use to display messages and find `nitc` bin.
        var toolcontext: ToolContext

        # Generate the test unit for `self` in `file`.
        fun write_to_nit(file: Template) do
                var name = test_method.name
                file.addn "if name == \"{name}\" then"
                if test_method.mproperty.is_toplevel then
                        file.addn "\t{name}"
                else
                        file.addn "\tvar subject = new {test_method.mclassdef.name}.nitunit"
                        file.addn "\tsubject.before_test"
                        file.addn "\tsubject.{name}"
                        file.addn "\tsubject.after_test"
                end
                file.addn "end"
        end

        # Execute the test case.
        fun run do
                toolcontext.info("Execute test-case {test_method.name}", 1)
                was_exec = true
                if toolcontext.opt_noact.value then return
                # execute
                var method_name = test_method.name
                var test_file = test_suite.test_file
                var res_name = "{test_file}_{method_name.escape_to_c}"
                var res = toolcontext.safe_exec("{test_file}.bin {method_name} > '{res_name}.out1' 2>&1 </dev/null")
                var f = new FileReader.open("{res_name}.out1")
                var msg = f.read_all
                f.close
                # set test case result
                var loc = test_method.location
                if res != 0 then
                        error = msg
                        toolcontext.warning(loc, "failure",
                           "ERROR: {method_name} (in file {test_file}.nit): {msg}")
                        toolcontext.modelbuilder.failed_tests += 1
                else
                        var mmodule = test_method.mclassdef.mmodule
                        var file = mmodule.filepath
                        if file != null then
                                var sav = file.dirname / mmodule.name + ".sav" / test_method.name + ".res"
                                if sav.file_exists then
                                        toolcontext.info("Diff output with {sav}", 1)
                                        res = toolcontext.safe_exec("diff -u --label 'expected:{sav}' --label 'got:{res_name}.out1' '{sav}' '{res_name}.out1' > '{res_name}.diff' 2>&1 </dev/null")
                                        if res != 0 then
                                                msg = "Diff\n" + "{res_name}.diff".to_path.read_all
                                                error = msg
                                                toolcontext.warning(loc, "failure",
                                                "ERROR: {method_name} (in file {test_file}.nit): {msg}")
                                                toolcontext.modelbuilder.failed_tests += 1
                                        end
                                else
                                        toolcontext.info("No diff: {sav} not found", 2)
                                end
                        end
                end
                toolcontext.check_errors
        end

        # Error occured during test-case execution.
        var error: nullable String = null

        # Was the test case executed at least one?
        var was_exec = false

        # Return the `TestCase` in XML format compatible with Jenkins.
        fun to_xml: HTMLTag do
                var mclassdef = test_method.mclassdef
                var tc = new HTMLTag("testcase")
                # NOTE: jenkins expects a '.' in the classname attr
                tc.attr("classname", "nitunit." + mclassdef.mmodule.full_name + "." + mclassdef.mclass.full_name)
                tc.attr("name", test_method.mproperty.full_name)
                if was_exec then
                        tc.add  new HTMLTag("system-out")
                        var n = new HTMLTag("system-err")
                        tc.add n
                        var error = self.error
                        if error != null then
                                n.append error.trunc(8192).filter_nonprintable
                                n = new HTMLTag("error")
                                n.attr("message", "Runtime Error")
                                tc.add n
                        end
                end
                return tc
        end
end

redef class MMethodDef
        # TODO use annotations?

        # Is the method a test_method?
        # i.e. begins with "test_"
        private fun is_test: Bool do return name.has_prefix("test_")

        # Is the method a "before_module"?
        private fun is_before_module: Bool do return mproperty.is_toplevel and name == "before_module"

        # Is the method a "after_module"?
        private fun is_after_module: Bool do return mproperty.is_toplevel and name == "after_module"
end

redef class MClassDef
        # Is the class a TestClass?
        # i.e. begins with "Test"
        private fun is_test: Bool do
                var in_hierarchy = self.in_hierarchy
                if in_hierarchy == null then return false
                for sup in in_hierarchy.greaters do
                        if sup.name == "TestSuite" then return true
                end
                return false
        end
end

redef class MModule
        # "before_module" method for this module.
        private fun before_test: nullable MMethodDef do
                for mclassdef in mclassdefs do
                        if not mclassdef.name == "Object" then continue
                        for mpropdef in mclassdef.mpropdefs do
                                if mpropdef isa MMethodDef and mpropdef.is_before_module then return mpropdef
                        end
                end
                return null
        end

        # "after_module" method for this module.
        private fun after_test: nullable MMethodDef do
                for mclassdef in mclassdefs do
                        if not mclassdef.name == "Object" then continue
                        for mpropdef in mclassdef.mpropdefs do
                                if mpropdef isa MMethodDef and mpropdef.is_after_module then return mpropdef
                        end
                end
                return null
        end
end

redef class ModelBuilder
        # Number of test classes generated.
        var total_classes = 0

        # Number of tests generated.
        var total_tests = 0

        # Number of failed tests.
        var failed_tests = 0

        # Run NitUnit test file for mmodule (if exists).
        fun test_unit(mmodule: MModule): HTMLTag do
                var ts = new HTMLTag("testsuite")
                toolcontext.info("nitunit: test-suite test_{mmodule}", 2)
                var f = toolcontext.opt_file.value
                var test_file = "test_{mmodule.name}.nit"
                if f != null then
                        test_file = f
                else if not test_file.file_exists then
                        var module_file = mmodule.location.file
                        if module_file == null then
                                toolcontext.info("Skip test for {mmodule}, no file found", 2)
                                return ts
                        end
                        var include_dir = module_file.filename.dirname
                        test_file = "{include_dir}/{test_file}"
                end
                if not test_file.file_exists then
                        toolcontext.info("Skip test for {mmodule}, no file {test_file} found", 2)
                        return ts
                end
                var tester = new NitUnitTester(self)
                var res = tester.test_module_unit(test_file)
                if res == null then
                        toolcontext.info("Skip test for {mmodule}, no test suite found", 2)
                        return ts
                end
                return res.to_xml
        end
end