generate: Add framework for testing output of generated code

generate/misc_test.go

@@ -0,0 +1,44 @@
+package generate
+
+import "os"
+import "fmt"
+import "os/exec"
+import "testing"
+import "path/filepath"
+
+func testGenerateRun(test *testing.T, protocol *Protocol, imports string, testCase string) {
+	// open files
+	dir, err := os.MkdirTemp(os.TempDir(), "hopp-generate-test-*")
+	if err != nil { test.Fatal(err) }
+	defer os.RemoveAll(dir)
+	sourceFile, err := os.Create(filepath.Join(dir, "protocol.go"))
+	if err != nil { test.Fatal(err) }
+	defer sourceFile.Close()
+	mainFile, err := os.Create(filepath.Join(dir, "main.go"))
+	if err != nil { test.Fatal(err) }
+	defer mainFile.Close()
+
+	// generate protocol
+	generator := Generator {
+		Output: sourceFile,
+		PackageName: "main",
+	}
+	_, err = generator.Generate(protocol)
+	if err != nil { test.Fatal(err) }
+
+	// build static source files
+	imports = `
+		import "log"
+		` + imports
+	setup := `log.Println("*** BEGIN TEST CASE OUTPUT ***")`
+	teardown := `log.Println("--- END TEST CASE OUTPUT ---")`
+	fmt.Fprintf(
+		mainFile, "package main\n%s\nfunc main() {%s\n%s\n%s\n}\n",
+		imports, setup, testCase, teardown)
+
+	// build and run test
+	command := exec.Command("go", "run", filepath.Join(dir, "main.go"))
+	output, err := command.CombinedOutput()
+	test.Logf("output of %v:\n%s", command, output)
+	if err != nil { test.Fatal(err) }
+}