Function TestWebAssembly

main_test.go:507–563

Test WebAssembly files for certain properties.

(t *testing.T)

// Test WebAssembly files for certain properties.
func TestWebAssembly(t *testing.T) {
	t.Parallel()
	type testCase struct {
		name          string
		target        string
		panicStrategy string
		imports       []string
	}
	for _, tc := range []testCase{
		// Test whether there really are no imports when using -panic=trap. This
		// tests the bugfix for https://github.com/tinygo-org/tinygo/issues/4161.
		{name: "panic-default", target: "wasip1", imports: []string{"wasi_snapshot_preview1.fd_write", "wasi_snapshot_preview1.random_get"}},
		{name: "panic-trap", target: "wasm-unknown", panicStrategy: "trap", imports: []string{}},
	} {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			tmpdir := t.TempDir()
			options := optionsFromTarget(tc.target, sema)
			options.PanicStrategy = tc.panicStrategy
			config, err := builder.NewConfig(&options)
			if err != nil {
				t.Fatal(err)
			}

			result, err := builder.Build("testdata/trivialpanic.go", ".wasm", tmpdir, config)
			if err != nil {
				t.Fatal("failed to build binary:", err)
			}
			f, err := os.Open(result.Binary)
			if err != nil {
				t.Fatal("could not open output binary:", err)
			}
			defer f.Close()
			module, err := wasm.Parse(f)
			if err != nil {
				t.Fatal("could not parse output binary:", err)
			}

			// Test the list of imports.
			if tc.imports != nil {
				var imports []string
				for _, section := range module.Sections {
					switch section := section.(type) {
					case *wasm.SectionImport:
						for _, symbol := range section.Entries {
							imports = append(imports, symbol.Module+"."+symbol.Field)
						}
					}
				}
				if !stringSlicesEqual(imports, tc.imports) {
					t.Errorf("import list not as expected!\nexpected: %v\nactual:   %v", tc.imports, imports)
				}
			}
		})
	}
}