api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/comment_new_test.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"testing"
+	"time"
+)
+
+func TestCommentNewBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	if _, err := commentNew("temp-commenter-hex", "example.com", "/path.html", "root", "**foo**", "approved", time.Now().UTC()); err != nil {
+		t.Errorf("unexpected error creating new comment: %v", err)
+		return
+	}
+}
+
+func TestCommentNewEmpty(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	if _, err := commentNew("temp-commenter-hex", "example.com", "", "root", "**foo**", "approved", time.Now().UTC()); err != nil {
+		t.Errorf("empty path not allowed: %v", err)
+		return
+	}
+
+	if _, err := commentNew("temp-commenter-hex", "", "", "root", "**foo**", "approved", time.Now().UTC()); err == nil {
+		t.Errorf("expected error not found creatingn new comment with empty domain")
+		return
+	}
+
+	if _, err := commentNew("", "", "", "", "", "", time.Now().UTC()); err == nil {
+		t.Errorf("expected error not found creatingn new comment with empty everything")
+		return
+	}
+}
+
+func TestCommentNewUpvoted(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	commentHex, _ := commentNew("temp-commenter-hex", "example.com", "/path.html", "root", "**foo**", "approved", time.Now().UTC())
+
+	statement := `
+    SELECT score
+    FROM comments
+    WHERE commentHex = $1;
+  `
+	row := db.QueryRow(statement, commentHex)
+
+	var score int
+	if err := row.Scan(&score); err != nil {
+		t.Errorf("error scanning score from comments table: %v", err)
+		return
+	}
+
+	if score != 1 {
+		t.Errorf("expected comment to be auto-upvoted")
+		return
+	}
+}