Voice agents change constantly. A small tweak to SSML, a new voice version, or a subtle prosody adjustment can quietly alter how users experience every call. Snapshot testing for voice responses exists to catch those changes before they reach production.
Cekura provides purpose-built tools to snapshot, compare, and validate SSML and synthesized speech so teams can ship voice updates with confidence
Capture What Actually Matters in Voice Output
Snapshot testing in voice systems needs to go beyond plain text.
With Cekura, teams can snapshot both the structured SSML and the resulting audio output generated from it. This makes it possible to detect regressions that text-only checks miss, like changes in pauses, emphasis, pitch, or timing.
You can snapshot:
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Raw SSML to track exact markup changes
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Normalized SSML to ignore non-semantic differences like whitespace or attribute order
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Synthesized audio tied directly to the same SSML input
This combined approach ensures the spoken result still sounds the way you expect, not just looks correct on paper.
Deterministic, Reproducible Voice Tests
Reliable snapshot tests require consistent outputs.
Cekura allows teams to lock voice configurations so the same SSML produces the same audio across test runs. This includes pinning voice versions and controlling synthesis variability so CI runs remain stable across environments.
The result is predictable pass or fail behavior instead of flaky tests caused by random voice variation.
High-Signal Diffs for SSML and Audio
When something changes, teams need to know why.
Cekura highlights meaningful differences rather than noise:
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SSML diffs that focus on semantic tag and attribute changes
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Audio comparisons that account for loudness normalization and timing alignment
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Configurable thresholds so minor, inaudible differences do not block releases
Failures are classified clearly so engineers can tell whether a change came from SSML structure, audio quality, or timing behavior.
Built for Real Developer Workflows
Snapshot tests should fit naturally into how teams already ship code.
Cekura supports declarative test definitions and versioned snapshots that work cleanly in CI pipelines. Audio artifacts and diffs are stored alongside test results, making reviews straightforward during pull requests.
Developers can listen to the exact segment that changed, approve intentional updates, or block regressions before deployment.
Works Across Voice Engines and Versions
Voice teams often depend on multiple TTS providers or custom voices.
Cekura snapshot testing works across vendors and voice models, with explicit version management to detect upstream changes. If a provider updates a voice model and the sound shifts, snapshot tests surface it immediately instead of weeks later through user complaints.
Diagnose Failures Quickly
When a snapshot test fails, Cekura makes it easy to understand what happened:
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Clear classification of text, audio, or timing changes
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Playback of only the affected audio segment
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Direct correlation with recent SSML or configuration updates
This shortens the feedback loop from hours of manual listening to minutes.
Secure by Design
Voice snapshots often contain sensitive data.
Cekura supports secure handling of SSML and audio artifacts, with encryption at rest and options to use redacted or synthetic test data. This allows teams in regulated environments to adopt snapshot testing without compromising internal policies.
Ship Voice Changes With Confidence
Snapshot testing is the foundation of reliable voice development. By validating both SSML and the actual spoken output, teams can move fast without guessing how changes will sound in production.
Cekura gives voice teams the tools to make SSML and TTS snapshot testing precise, reproducible, and practical at scale.