feat: Introduce simple arch tests (#2210)

* Add naive file getting

* Test naively (resources)

* Split into files

* Add assertion for non-acceptance tests

* Reorganize

* Extract files

* Extract directory

* Extract method

* Rename to archtest

* Split lib and our usage into 2 different packages

* Introduce datasources tests

* Start testing archtest

* Parametrize directories test

* Change API

* Rename to architest

* Add nicer assertions

* Add file to method

* Rename to exported methods

* Test file

* Test file filtering

* Add tests for package assertions

* Test rest of the assertions

* Test invocation on every file and method

* Test creation of directory and file

* Add tests for sdk integration tests

* Add tests integration tests matchers

* Fix lint and stuff

* Add sample usage

* Fix test setup

* Fix after review

* Introduce FilesProvider

* Add recipe

Makefile

@@ -38,18 +38,18 @@ install: ## install the binary
 	go install -v ./...
 
 lint: # Run static code analysis, check formatting. See https://golangci-lint.run/
-	golangci-lint run ./... -v
+	./bin/golangci-lint run ./... -v
 
 lint-fix: ## Run static code analysis, check formatting and try to fix findings
-	golangci-lint run ./... -v --fix
+	./bin/golangci-lint run ./... -v --fix
 
 mod: ## add missing and remove unused modules
 	go mod tidy -compat=1.20
 
 mod-check: mod ## check if there are any missing/unused modules
 	git diff --exit-code -- go.mod go.sum
 
-pre-push: fmt docs mod lint   ## Run a few checks before pushing a change (docs, fmt, mod, etc.)
+pre-push: fmt docs mod lint test-architecture ## Run a few checks before pushing a change (docs, fmt, mod, etc.)
 
 pre-push-check: fmt-check docs-check lint-check mod-check ## Run a few checks before pushing a change (docs, fmt, mod, etc.)
 
@@ -68,6 +68,9 @@ test: ## run unit and integration tests
 test-acceptance: ## run acceptance tests
 	TF_ACC=1 go test -run "^TestAcc_" -v -cover -timeout=30m ./...
 
+test-architecture: ## check architecture constraints between packages
+	go test ./pkg/architests/... -v
+
 build-local: ## build the binary locally
 	go build -o $(BASE_BINARY_NAME) .
 

pkg/architest/architest_test.go

@@ -0,0 +1,357 @@
+package architest_test
+
+import (
+	"fmt"
+	"regexp"
+	"testing"
+
+	"github.com/Snowflake-Labs/terraform-provider-snowflake/pkg/architest"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Directory(t *testing.T) {
+	t.Run("fail to use non-existing directory", func(t *testing.T) {
+		assert.Panics(t, func() {
+			architest.Directory("testdata/non_existing")
+		})
+	})
+
+	t.Run("use directory", func(t *testing.T) {
+		assert.NotPanics(t, func() {
+			architest.Directory("testdata/dir1")
+		})
+	})
+
+	tests1 := []struct {
+		directory            string
+		expectedFileNames    []string
+		expectedPackageNames []string
+	}{
+		{directory: "testdata/dir1", expectedFileNames: []string{"testdata/dir1/sample1.go", "testdata/dir1/sample2.go", "testdata/dir1/different1.go"}, expectedPackageNames: []string{"dir1"}},
+		{directory: "testdata/dir2", expectedFileNames: []string{"testdata/dir2/sample1.go", "testdata/dir2/sample1_test.go"}, expectedPackageNames: []string{"dir2", "dir2_test"}},
+		{directory: "testdata/dir3", expectedFileNames: []string{"testdata/dir3/sample1.go", "testdata/dir3/sample1_acceptance_test.go"}, expectedPackageNames: []string{"dir3", "dir3_test"}},
+		{directory: "testdata/dir4", expectedFileNames: []string{"testdata/dir4/sample1.go", "testdata/dir4/sample1_integration_test.go"}, expectedPackageNames: []string{"dir4", "dir4_test"}},
+	}
+	for _, tt := range tests1 {
+		t.Run("list all files in the given directory", func(t *testing.T) {
+			dir := architest.Directory(tt.directory)
+
+			allFiles := dir.AllFiles()
+			assert.Len(t, allFiles, len(tt.expectedFileNames))
+
+			fileNames := make([]string, 0, len(allFiles))
+			for _, f := range allFiles {
+				fileNames = append(fileNames, f.Name())
+			}
+			assert.ElementsMatch(t, fileNames, tt.expectedFileNames)
+
+			packageNames := make(map[string]bool)
+			for _, f := range allFiles {
+				packageNames[f.PackageName()] = true
+			}
+			assert.Len(t, packageNames, len(tt.expectedPackageNames))
+			for _, name := range tt.expectedPackageNames {
+				assert.Contains(t, packageNames, name)
+			}
+		})
+	}
+
+	tests2 := []struct {
+		directory         string
+		filter            architest.FileFilter
+		expectedFileNames []string
+	}{
+		{directory: "testdata/dir1", filter: architest.FileNameFilterProvider("sample"), expectedFileNames: []string{"testdata/dir1/sample1.go", "testdata/dir1/sample2.go"}},
+		{directory: "testdata/dir1", filter: architest.FileNameRegexFilterProvider(regexp.MustCompile("sample")), expectedFileNames: []string{"testdata/dir1/sample1.go", "testdata/dir1/sample2.go"}},
+		{directory: "testdata/dir1", filter: architest.FileNameFilterWithExclusionsProvider(regexp.MustCompile("sample"), regexp.MustCompile("sample1")), expectedFileNames: []string{"testdata/dir1/sample2.go"}},
+		{directory: "testdata/dir2", filter: architest.PackageFilterProvider("dir2"), expectedFileNames: []string{"testdata/dir2/sample1.go"}},
+		{directory: "testdata/dir2", filter: architest.PackageFilterProvider("dir2_test"), expectedFileNames: []string{"testdata/dir2/sample1_test.go"}},
+		{directory: "testdata/dir2", filter: architest.FileNameRegexFilterProvider(architest.AcceptanceTestFileRegex), expectedFileNames: []string{}},
+		{directory: "testdata/dir3", filter: architest.FileNameRegexFilterProvider(architest.AcceptanceTestFileRegex), expectedFileNames: []string{"testdata/dir3/sample1_acceptance_test.go"}},
+		{directory: "testdata/dir4", filter: architest.FileNameRegexFilterProvider(architest.AcceptanceTestFileRegex), expectedFileNames: []string{}},
+		{directory: "testdata/dir2", filter: architest.FileNameRegexFilterProvider(architest.IntegrationTestFileRegex), expectedFileNames: []string{}},
+		{directory: "testdata/dir3", filter: architest.FileNameRegexFilterProvider(architest.IntegrationTestFileRegex), expectedFileNames: []string{}},
+		{directory: "testdata/dir4", filter: architest.FileNameRegexFilterProvider(architest.IntegrationTestFileRegex), expectedFileNames: []string{"testdata/dir4/sample1_integration_test.go"}},
+		{directory: "testdata/dir2", filter: architest.FileNameRegexFilterProvider(architest.TestFileRegex), expectedFileNames: []string{"testdata/dir2/sample1_test.go"}},
+		{directory: "testdata/dir3", filter: architest.FileNameRegexFilterProvider(architest.TestFileRegex), expectedFileNames: []string{"testdata/dir3/sample1_acceptance_test.go"}},
+		{directory: "testdata/dir4", filter: architest.FileNameRegexFilterProvider(architest.TestFileRegex), expectedFileNames: []string{"testdata/dir4/sample1_integration_test.go"}},
+	}
+	for _, tt := range tests2 {
+		t.Run("list only files matching filter in the given directory", func(t *testing.T) {
+			dir := architest.Directory(tt.directory)
+
+			filteredFiles := dir.Files(tt.filter)
+			assert.Len(t, filteredFiles, len(tt.expectedFileNames))
+
+			fileNames := make([]string, 0, len(filteredFiles))
+			for _, f := range filteredFiles {
+				fileNames = append(fileNames, f.Name())
+			}
+			assert.ElementsMatch(t, fileNames, tt.expectedFileNames)
+
+			// now exactly the same but indirectly
+			filteredFiles = dir.AllFiles().Filter(tt.filter)
+			assert.Len(t, filteredFiles, len(tt.expectedFileNames))
+
+			fileNames = make([]string, 0, len(filteredFiles))
+			for _, f := range filteredFiles {
+				fileNames = append(fileNames, f.Name())
+			}
+			assert.ElementsMatch(t, fileNames, tt.expectedFileNames)
+		})
+	}
+}
+
+func Test_Files(t *testing.T) {
+	t.Run("fail to use non-existing file", func(t *testing.T) {
+		assert.Panics(t, func() {
+			architest.NewFileFromPath("testdata/dir1/non_existing.go")
+		})
+	})
+
+	t.Run("use file", func(t *testing.T) {
+		assert.NotPanics(t, func() {
+			architest.NewFileFromPath("testdata/dir1/sample1.go")
+		})
+	})
+
+	tests1 := []struct {
+		filePath            string
+		expectedMethodNames []string
+	}{
+		{filePath: "testdata/dir1/sample1.go", expectedMethodNames: []string{}},
+		{filePath: "testdata/dir1/sample2.go", expectedMethodNames: []string{"A"}},
+	}
+	for _, tt := range tests1 {
+		t.Run("list all methods in file", func(t *testing.T) {
+			file := architest.NewFileFromPath(tt.filePath)
+
+			exportedMethods := file.ExportedMethods()
+			assert.Len(t, exportedMethods, len(tt.expectedMethodNames))
+
+			methodNames := make([]string, 0, len(exportedMethods))
+			for _, m := range exportedMethods {
+				methodNames = append(methodNames, m.Name())
+			}
+			assert.ElementsMatch(t, methodNames, tt.expectedMethodNames)
+		})
+	}
+
+	tests2 := []struct {
+		fileNames []string
+	}{
+		{fileNames: []string{}},
+		{fileNames: []string{"a"}},
+		{fileNames: []string{"a", "A"}},
+		{fileNames: []string{"A", "a"}},
+		{fileNames: []string{"A", "B", "C"}},
+	}
+	for _, tt := range tests2 {
+		t.Run("receiver invoked for every file", func(t *testing.T) {
+			files := make(architest.Files, 0, len(tt.fileNames))
+			for _, f := range tt.fileNames {
+				files = append(files, *architest.NewFile("package", f, nil))
+			}
+			invokedFiles := make([]string, 0)
+			receiver := func(f *architest.File) {
+				invokedFiles = append(invokedFiles, f.Name())
+			}
+
+			files.All(receiver)
+
+			assert.ElementsMatch(t, tt.fileNames, invokedFiles)
+		})
+	}
+}
+
+func Test_Methods(t *testing.T) {
+	tests := []struct {
+		methodNames []string
+	}{
+		{methodNames: []string{}},
+		{methodNames: []string{"a"}},
+		{methodNames: []string{"a", "A"}},
+		{methodNames: []string{"A", "a"}},
+		{methodNames: []string{"A", "B", "C"}},
+	}
+	for _, tt := range tests {
+		t.Run("receiver invoked for every method", func(t *testing.T) {
+			methods := make(architest.Methods, 0, len(tt.methodNames))
+			for _, m := range tt.methodNames {
+				methods = append(methods, *architest.NewMethod(m, nil))
+			}
+			invokedMethods := make([]string, 0)
+			receiver := func(m *architest.Method) {
+				invokedMethods = append(invokedMethods, m.Name())
+			}
+
+			methods.All(receiver)
+
+			assert.ElementsMatch(t, tt.methodNames, invokedMethods)
+		})
+	}
+}
+
+func Test_Assertions(t *testing.T) {
+	tests1 := []struct {
+		filePath        string
+		expectedPackage string
+	}{
+		{filePath: "testdata/dir1/sample1.go", expectedPackage: "dir1"},
+		{filePath: "testdata/dir2/sample1.go", expectedPackage: "dir2"},
+		{filePath: "testdata/dir2/sample1_test.go", expectedPackage: "dir2_test"},
+	}
+	for _, tt := range tests1 {
+		t.Run("file package assertions", func(t *testing.T) {
+			file := architest.NewFileFromPath(tt.filePath)
+			tut1 := &testing.T{}
+			tut2 := &testing.T{}
+
+			file.AssertHasPackage(tut1, tt.expectedPackage)
+			file.AssertHasPackage(tut2, "some_other_package")
+
+			assert.Equal(t, false, tut1.Failed())
+			assert.Equal(t, true, tut2.Failed())
+		})
+	}
+
+	tests2 := []struct {
+		methodName string
+		correct    bool
+	}{
+		{methodName: "TestAcc_abc", correct: true},
+		{methodName: "TestAcc_TestAcc_Test", correct: true},
+		{methodName: "TestAcc_", correct: false},
+		{methodName: "ATestAcc_", correct: false},
+		{methodName: "TestAcc", correct: false},
+		{methodName: "Test_", correct: false},
+		{methodName: "Test", correct: false},
+		{methodName: "Test_asdf", correct: false},
+		{methodName: "TestAccc_", correct: false},
+		{methodName: "TestInt_Abc", correct: false},
+	}
+	for _, tt := range tests2 {
+		t.Run(fmt.Sprintf("acceptance test name assertions for method %s", tt.methodName), func(t *testing.T) {
+			file := architest.NewFileFromPath("testdata/dir1/sample1.go")
+			method := architest.NewMethod(tt.methodName, file)
+			tut := &testing.T{}
+
+			method.AssertAcceptanceTestNamedCorrectly(tut)
+
+			assert.Equal(t, !tt.correct, tut.Failed())
+		})
+	}
+
+	tests3 := []struct {
+		methodName string
+		regexRaw   string
+		correct    bool
+	}{
+		{methodName: "sample1", regexRaw: "sample", correct: true},
+		{methodName: "Sample1", regexRaw: "sample", correct: false},
+		{methodName: "Sample1", regexRaw: "Sample", correct: true},
+	}
+	for _, tt := range tests3 {
+		t.Run(fmt.Sprintf("matching and not matching method name assertions for %s", tt.methodName), func(t *testing.T) {
+			file := architest.NewFileFromPath("testdata/dir1/sample1.go")
+			method := architest.NewMethod(tt.methodName, file)
+			tut1 := &testing.T{}
+			tut2 := &testing.T{}
+
+			method.AssertNameMatches(tut1, regexp.MustCompile(tt.regexRaw))
+			method.AssertNameDoesNotMatch(tut2, regexp.MustCompile(tt.regexRaw))
+
+			assert.Equal(t, !tt.correct, tut1.Failed())
+			assert.Equal(t, tt.correct, tut2.Failed())
+		})
+	}
+
+	tests4 := []struct {
+		methodName string
+		correct    bool
+	}{
+		{methodName: "Test", correct: true},
+		{methodName: "aTest", correct: false},
+		{methodName: "Test_", correct: true},
+		{methodName: "Test_adsfadf", correct: true},
+	}
+	for _, tt := range tests4 {
+		t.Run(fmt.Sprintf("test name assertions for method %s", tt.methodName), func(t *testing.T) {
+			file := architest.NewFileFromPath("testdata/dir1/sample1.go")
+			method := architest.NewMethod(tt.methodName, file)
+			tut := &testing.T{}
+
+			method.AssertTestNamedCorrectly(tut)
+
+			assert.Equal(t, !tt.correct, tut.Failed())
+		})
+	}
+
+	tests5 := []struct {
+		methodName string
+		correct    bool
+	}{
+		{methodName: "TestInt_abc", correct: true},
+		{methodName: "TestInt_TestInt_Test", correct: true},
+		{methodName: "TestInt_", correct: false},
+		{methodName: "ATestInt_", correct: false},
+		{methodName: "TestInt", correct: false},
+		{methodName: "Test_", correct: false},
+		{methodName: "Test", correct: false},
+		{methodName: "Test_asdf", correct: false},
+		{methodName: "TestIntt_", correct: false},
+		{methodName: "TestAcc_Abc", correct: false},
+	}
+	for _, tt := range tests5 {
+		t.Run(fmt.Sprintf("intagration test name assertions for method %s", tt.methodName), func(t *testing.T) {
+			file := architest.NewFileFromPath("testdata/dir1/sample1.go")
+			method := architest.NewMethod(tt.methodName, file)
+			tut := &testing.T{}
+
+			method.AssertIntegrationTestNamedCorrectly(tut)
+
+			assert.Equal(t, !tt.correct, tut.Failed())
+		})
+	}
+}
+
+func Test_SampleArchiTestUsage(t *testing.T) {
+	t.Run("acceptance tests", func(t *testing.T) {
+		acceptanceTestFiles := architest.Directory("testdata/dir3/").
+			AllFiles().
+			Filter(architest.FileNameRegexFilterProvider(architest.AcceptanceTestFileRegex))
+
+		acceptanceTestFiles.All(func(file *architest.File) {
+			file.AssertHasPackage(t, "dir3_test")
+			file.ExportedMethods().All(func(method *architest.Method) {
+				method.AssertAcceptanceTestNamedCorrectly(t)
+			})
+		})
+	})
+
+	t.Run("integration tests", func(t *testing.T) {
+		integrationTestFiles := architest.Directory("testdata/dir4/").
+			AllFiles().
+			Filter(architest.FileNameRegexFilterProvider(architest.IntegrationTestFileRegex))
+
+		integrationTestFiles.All(func(file *architest.File) {
+			file.AssertHasPackage(t, "dir4_test")
+			file.ExportedMethods().All(func(method *architest.Method) {
+				method.AssertIntegrationTestNamedCorrectly(t)
+			})
+		})
+	})
+
+	t.Run("tests", func(t *testing.T) {
+		testFiles := architest.Directory("testdata/dir2/").
+			AllFiles().
+			Filter(architest.FileNameRegexFilterProvider(architest.TestNameRegex))
+
+		testFiles.All(func(file *architest.File) {
+			file.AssertHasPackage(t, "dir2_test")
+			file.ExportedMethods().All(func(method *architest.Method) {
+				method.AssertTestNamedCorrectly(t)
+			})
+		})
+	})
+}