Verify multimodal content boundaries and every material sort

internal/platform/integration_test.go

@@ -168,6 +168,21 @@ func TestOnboardingAndSharing(t *testing.T) {
 	call("DELETE", workspacePath+"/tags/"+tag["id"].(string), tokens[0], nil, 204)
 	call("PATCH", textPath, tokens[0], changed, 412, `"3"`)
 
+	imageContent := response{"image": response{"url": "https://assets.example.com/image.png", "alt": "Photo"}}
+	call("POST", workspacePath+"/materials", tokens[0], response{"kind": "image", "title": "Photo", "content": imageContent}, 201)
+	call("POST", workspacePath+"/materials", tokens[0], response{"kind": "card", "title": "Mixed card", "content": response{"parts": []any{
+		response{"kind": "text", "text": "Caption"},
+		response{"kind": "article", "article": articleContent["article"]},
+		response{"kind": "image", "image": imageContent["image"]},
+	}}}, 201)
+	for _, sort := range []string{"modified", "created", "alphabetical", "opened", "tag"} {
+		call("GET", workspacePath+"/materials?sort="+sort+"&limit=2", tokens[0], nil, 200)
+	}
+	images := call("GET", workspacePath+"/materials?kind=image&q=Photo", tokens[0], nil, 200)
+	if len(images["items"].([]any)) != 1 {
+		t.Fatal("kind/title filter returned incorrect materials")
+	}
+
 	email := "fixture@example.invalid"
 	password := "a-long-fixture-password"
 	call("POST", base+"/auth/register", "", response{"email": email, "password": password}, 202)