Add unit tests for Parser (#1815)

parser/parser_test.go

+package parser
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Parser(t *testing.T) {
+
+	input := `
+FROM model1
+ADAPTER adapter1
+LICENSE MIT
+PARAMETER param1 value1
+PARAMETER param2 value2
+TEMPLATE template1
+`
+
+	reader := strings.NewReader(input)
+
+	commands, err := Parse(reader)
+	assert.Nil(t, err)
+
+	expectedCommands := []Command{
+		{Name: "model", Args: "model1"},
+		{Name: "adapter", Args: "adapter1"},
+		{Name: "license", Args: "MIT"},
+		{Name: "param1", Args: "value1"},
+		{Name: "param2", Args: "value2"},
+		{Name: "template", Args: "template1"},
+	}
+
+	assert.Equal(t, expectedCommands, commands)
+}
+
+func Test_Parser_NoFromLine(t *testing.T) {
+
+	input := `
+PARAMETER param1 value1
+PARAMETER param2 value2
+`
+
+	reader := strings.NewReader(input)
+
+	_, err := Parse(reader)
+	assert.ErrorContains(t, err, "no FROM line")
+}
+
+func Test_Parser_MissingValue(t *testing.T) {
+
+	input := `
+FROM foo
+PARAMETER param1
+`
+
+	reader := strings.NewReader(input)
+
+	_, err := Parse(reader)
+	assert.ErrorContains(t, err, "missing value for [param1]")
+
+}