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/domain_moderator_delete_test.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestDomainModeratorDeleteBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	domainModeratorNew("example.com", "test@example.com")
+	domainModeratorNew("example.com", "test2@example.com")
+
+	if err := domainModeratorDelete("example.com", "test@example.com"); err != nil {
+		t.Errorf("unexpected error creating new domain moderator: %v", err)
+		return
+	}
+
+	isMod, _ := isDomainModerator("example.com", "test@example.com")
+	if isMod {
+		t.Errorf("email %s still moderator after deletion", "test@example.com")
+		return
+	}
+
+	isMod, _ = isDomainModerator("example.com", "test2@example.com")
+	if !isMod {
+		t.Errorf("email %s no longer moderator after deleting a different email", "test@example.com")
+		return
+	}
+}
+
+func TestDomainModeratorDeleteEmpty(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	domainModeratorNew("example.com", "test@example.com")
+
+	if err := domainModeratorDelete("example.com", ""); err == nil {
+		t.Errorf("expected error not found when passing empty email")
+		return
+	}
+
+	if err := domainModeratorDelete("", ""); err == nil {
+		t.Errorf("expected error not found when passing empty everything")
+		return
+	}
+}