test(WriteStagingModels): Add test to WriteStagingModels

Add an initial test that data is properly templated to staging models in WriteStagingModels.

write_staging_models_test.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/gwenwindflower/tbd/shared"
+)
+
+func TestWriteStagingModels(t *testing.T) {
+	ts := shared.SourceTables{
+		SourceTables: []shared.SourceTable{
+			{
+				Name: "table1",
+				Columns: []shared.Column{
+					{
+						Name:     "COLUMN3",
+						DataType: "numbers",
+					},
+				},
+				DataTypeGroups: map[string][]shared.Column{
+					"text": {
+						shared.Column{
+							Name:     "column1",
+							DataType: "text",
+						},
+						shared.Column{
+							Name:     "column2",
+							DataType: "text",
+						},
+					},
+					"numbers": {
+						shared.Column{
+							Name:     "COLUMN3",
+							DataType: "numbers",
+						},
+					},
+				},
+			},
+		},
+	}
+	expect := `with
+
+source as (
+
+    select * from {{ ref('table1') }}
+
+),
+
+renamed as (
+
+    select
+        -- numbers
+        COLUMN3 as column3,
+        
+        -- text
+        column1 as column1,
+        column2 as column2,
+        
+    from source
+)
+
+select * from renamed
+`
+	bd := t.TempDir()
+	WriteStagingModels(ts, bd, "stg")
+	got, err := os.ReadFile(bd + "/stg_table1.sql")
+	if err != nil {
+		t.Errorf("Error reading staging file %v", err)
+	}
+	if string(got) != expect {
+		t.Errorf("Expected %v, got %v", expect, string(got))
+	}
+}