Added tests for examples

examples/write/write.q

@@ -0,0 +1,13 @@
+main() {
+	address := 4194304 + 1
+	length := (0 + 50 - 20) * 10 / 100
+	print(address, length)
+}
+
+print(address, length) {
+	write(length-2, address, length)
+}
+
+write(fd, address, length) {
+	syscall(1, fd, address, length)
+}

examples_test.go

@@ -0,0 +1,67 @@
+package main_test
+
+import (
+	"os"
+	"os/exec"
+	"testing"
+
+	"git.akyoto.dev/cli/q/src/build"
+	"git.akyoto.dev/go/assert"
+)
+
+func TestExamples(t *testing.T) {
+	var examples = []struct {
+		Name             string
+		ExpectedOutput   string
+		ExpectedExitCode int
+	}{
+		{"hello", "", 25},
+		{"write", "ELF", 0},
+	}
+
+	for _, example := range examples {
+		example := example
+
+		t.Run(example.Name, func(t *testing.T) {
+			runExample(t, example.Name, example.ExpectedOutput, example.ExpectedExitCode)
+		})
+	}
+}
+
+// runExample builds and runs the example to check if the output matches the expected output.
+func runExample(t *testing.T, name string, expectedOutput string, expectedExitCode int) {
+	b := build.New("examples/" + name)
+	assert.True(t, len(b.Executable()) > 0)
+	defer os.Remove(b.Executable())
+
+	t.Run("Compile", func(t *testing.T) {
+		result, err := b.Run()
+		assert.Nil(t, err)
+
+		err = result.Write(b.Executable())
+		assert.Nil(t, err)
+
+		stat, err := os.Stat(b.Executable())
+		assert.Nil(t, err)
+		assert.True(t, stat.Size() > 0)
+	})
+
+	t.Run("Output", func(t *testing.T) {
+		cmd := exec.Command(b.Executable())
+		output, err := cmd.Output()
+		exitCode := 0
+
+		if err != nil {
+			exitError, ok := err.(*exec.ExitError)
+
+			if !ok {
+				t.Fatal(exitError)
+			}
+
+			exitCode = exitError.ExitCode()
+		}
+
+		assert.Equal(t, exitCode, expectedExitCode)
+		assert.DeepEqual(t, string(output), expectedOutput)
+	})
+}

src/build/Result.go

@@ -63,3 +63,9 @@ func (r *Result) EachFunction(caller *Function, traversed map[*Function]bool, ca
 		r.EachFunction(callee, traversed, call)
 	}
 }
+
+// Write write the final executable to disk.
+func (r *Result) Write(path string) error {
+	code, data := r.Finalize()
+	return Write(path, code, data)
+}

src/cli/Build.go

@@ -53,9 +53,7 @@ func Build(args []string) int {
 		return 0
 	}
 
-	path := b.Executable()
-	code, data := result.Finalize()
-	err = build.Write(path, code, data)
+	err = result.Write(b.Executable())
 
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)