feat: Read params from file for template/workspace creation (#1541)

* Read params from file for template/workspace creation

* Use os.ReadFile

* Refactor reading params into a separate module

* Add comments and unit tests

* Rename variable

* Uncomment and fix unit test

* Fix comment

* Refactor tests

* Fix unit tests for windows

* Fix unit tests for Windows

* Add comments for the hotfix

cli/parameter_internal_test.go

@@ -0,0 +1,79 @@
+package cli
+
+import (
+	"os"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCreateParameterMapFromFile(t *testing.T) {
+	t.Parallel()
+	t.Run("CreateParameterMapFromFile", func(t *testing.T) {
+		t.Parallel()
+		tempDir := t.TempDir()
+		parameterFile, _ := os.CreateTemp(tempDir, "testParameterFile*.yaml")
+		_, _ = parameterFile.WriteString("region: \"bananas\"\ndisk: \"20\"\n")
+
+		parameterMapFromFile, err := createParameterMapFromFile(parameterFile.Name())
+
+		expectedMap := map[string]string{
+			"region": "bananas",
+			"disk":   "20",
+		}
+
+		assert.Equal(t, expectedMap, parameterMapFromFile)
+		assert.Nil(t, err)
+
+		removeTmpDirUntilSuccess(t, tempDir)
+	})
+	t.Run("WithEmptyFilename", func(t *testing.T) {
+		t.Parallel()
+
+		parameterMapFromFile, err := createParameterMapFromFile("")
+
+		assert.Nil(t, parameterMapFromFile)
+		assert.EqualError(t, err, "Parameter file name is not specified")
+	})
+	t.Run("WithInvalidFilename", func(t *testing.T) {
+		t.Parallel()
+
+		parameterMapFromFile, err := createParameterMapFromFile("invalidFile.yaml")
+
+		assert.Nil(t, parameterMapFromFile)
+
+		// On Unix based systems, it is: `open invalidFile.yaml: no such file or directory`
+		// On Windows, it is `open invalidFile.yaml: The system cannot find the file specified.`
+		if runtime.GOOS == "windows" {
+			assert.EqualError(t, err, "open invalidFile.yaml: The system cannot find the file specified.")
+		} else {
+			assert.EqualError(t, err, "open invalidFile.yaml: no such file or directory")
+		}
+	})
+	t.Run("WithInvalidYAML", func(t *testing.T) {
+		t.Parallel()
+		tempDir := t.TempDir()
+		parameterFile, _ := os.CreateTemp(tempDir, "testParameterFile*.yaml")
+		_, _ = parameterFile.WriteString("region = \"bananas\"\ndisk = \"20\"\n")
+
+		parameterMapFromFile, err := createParameterMapFromFile(parameterFile.Name())
+
+		assert.Nil(t, parameterMapFromFile)
+		assert.EqualError(t, err, "yaml: unmarshal errors:\n  line 1: cannot unmarshal !!str `region ...` into map[string]string")
+
+		removeTmpDirUntilSuccess(t, tempDir)
+	})
+}
+
+// Need this for Windows because of a known issue with Go:
+// https://github.com/golang/go/issues/52986
+func removeTmpDirUntilSuccess(t *testing.T, tempDir string) {
+	t.Helper()
+	t.Cleanup(func() {
+		err := os.RemoveAll(tempDir)
+		for err != nil {
+			err = os.RemoveAll(tempDir)
+		}
+	})
+}