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test: cover the remaining branches and gate branch coverage
97 tests (was 67). Line coverage 99.94%, branch coverage 74.5%: of the 448 missed branches, 447 are kotlinx.serialization-generated (write$Self and decoding constructors) and unreachable because payloads always encode defaults. Kover now gates both units. The tests against the real SDK showed that DeviceType is a sealed interface (only DeviceGroup and AccessoryType), that Permission is a final class without copy(), and that heart-rate points need an end time; the device mapping and the stub follow. Changes: - library/src/test/kotlin/.../decorator/DecoratorTest.kt: map conversion, error wrapping, devices, enums, aggregates, data point helpers, filters - library/src/test/kotlin/.../payload/PayloadContractTest.kt: every factory, optional fields, SDK-side nulls, skin temperature series, user profile - library/src/test/kotlin/.../service/ServiceEdgeCaseTest.kt: paging under the limit, user profile, date grouping, skipped changes, client ids for every writable type, resolve, default permissions, facade connection, exceptions - library/src/test/kotlin/.../{ReadOnlySampleTest,ValueTypeTest,Fixtures}.kt: extended - library/build.gradle.kts: Kover gates minBound(99, LINE), minBound(74, BRANCH) - library/src/main/kotlin/.../decorator/Extensions+Device.kt: exhaustive when over the sealed DeviceType - library/src/main/kotlin/.../service/SamsungHealthWriter.kt: simpler client id assignment - samsung-health-data-stub: sealed DeviceType; Permission as a final class like the SDK - AGENTS.md, docs/arc42/01, 08, 10: coverage gates and test counts Tests: 97 tests, 0 failures against the real SDK and the stub; koverVerify, ktlint, detekt, Android lint and apiCheck pass.
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‎AGENTS.md‎

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@@ -111,7 +111,7 @@ app/ (Compose MVVM demo app)
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* **Not covered** — stateless platform queries (`SamsungHealthReporter.isAvailable(context)`) and factories on payloads/types (`HeartRate.make(from:)`, `HealthType.make(from:)`, `HeartRate.collect(...)`) in `companion object`s.
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* ❌ **Ban on Static-Only Utility Types**: No `object Utils` / `class Helpers` that only namespace functions. Put behavior in an extension of the type it belongs to (`Extensions+Instant.kt` → `Instant.epochMillis`).
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* ❌ **Ban on Exposing SDK Types in Public API**: Public classes, functions, properties and typealiases never mention `HealthDataPoint`, `DataType`, `DataTypes`, `Permission`, `LocalTimeFilter`, `HealthDataStore` or any other SDK type; mapping happens in the payloads' `asOriginal()` / `from(point)` and in `decorator/`. No public `typealias` to an SDK type.
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* ❌ **Ban on Unguarded SDK Versions**: A data type or field that needs a newer SDK or Samsung Health version than the declared minimum (§7) is gated: the service throws `SamsungHealthException.NotAvailable("<type> needs Samsung Health Data SDK X.Y")` or degrades gracefully.
114+
* ❌ **Ban on Unguarded SDK Versions**: A data type or field that needs a newer SDK or Samsung Health version than the declared minimum (§7) is gated: the service throws `SamsungHealthException.InvalidType("<type> needs Samsung Health Data SDK X.Y")` or degrades gracefully. (There is deliberately no `NotAvailable` case: availability is `SamsungHealthReporter.isAvailable`, setup problems are `Resolvable`.)
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* ❌ **Ban on Ad-hoc Errors**: Throw only `SamsungHealthException` subclasses with a descriptive message (`SamsungHealthException.InvalidType("Invalid HealthType: $type")`). SDK exceptions (`HealthDataException`, `ResolvablePlatformException`, ...) are caught at the service boundary and wrapped, keeping the original as `cause`. No new exception hierarchies, no bare `Exception` / `IllegalStateException`.
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* ❌ **Ban on `!!`, `error()`, `TODO()` and Unchecked Casts**: Use `?: throw SamsungHealthException...`, `requireNotNull` is also banned in `main`; `as?` + throw instead of `as`.
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* ❌ **Ban on Inputs the SDK Rejects at Runtime**: Validate in Kotlin before calling the SDK (end before start, writes to read-only types, empty permission sets, missing required fields such as `BloodGlucoseType.MEAL_STATUS`) and throw `SamsungHealthException.InvalidValue`.
@@ -258,7 +258,7 @@ Before any commit or PR creation, the codebase must pass all gates:
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2. `testDebugUnitTest` — **all tests green**; quote the executed/failed counts it prints.
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3. `apiCheck` — passes; a deliberate public API change ships its regenerated `library/api/library.api` (`./gradlew apiDump`).
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4. Example app builds — **required whenever public API changes**. Otherwise state "not applicable — no public API change" in the evidence line rather than omitting it: an unstated gate reads as a skipped one.
261-
5. Coverage — `koverVerify` passes the minimum line coverage in `library/build.gradle.kts` (`minBound(98)` as of 09.10.2026, measured 98.3%); quote the measured percentage. A PR that adds tests raises the bound to its new measured level (rounded down); never lower it.
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5. Coverage — `koverVerify` passes the minimum line and branch coverage in `library/build.gradle.kts` (`minBound(99, LINE)` and `minBound(74, BRANCH)` as of 09.10.2026, measured 99.94% / 74.5%; almost all missed branches are kotlinx.serialization-generated); quote the measured percentages. A PR that adds tests raises the bounds to its new measured levels (rounded down); never lower them.
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---
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‎docs/arc42/01-introduction-and-goals.md‎

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@@ -27,7 +27,7 @@ Version 1.0.0 replaces the 0.0.x library, which wrapped the deprecated Samsung H
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| 1 | **Encapsulation of the SDK** | Consumers never see Samsung SDK types; the SDK can change (it already renamed types and changed nullability between 1.0.0 betas) without breaking consumers. Enforced by `library/api/library.api`. |
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| 2 | **Contract stability** | Payload JSON and map keys are consumed by other runtimes (Flutter, backends); renaming one is a major release. |
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| 3 | **Safety** | No blocking calls, no crashes from SDK exceptions: every failure is a typed `SamsungHealthException`. |
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| 4 | **Testability without a phone** | 67 JVM unit tests run against the real SDK AAR and against a documented-API stub; line coverage ≥ 98%. |
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| 4 | **Testability without a phone** | 97 JVM unit tests run against the real SDK AAR and against a documented-API stub; line coverage ≥ 99%, branch coverage ≥ 74%. |
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| 5 | **Parity with HealthKitReporter** | Cross-platform consumers (the Flutter plugins) map one mental model onto both platforms. |
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## 1.3 Stakeholders

‎docs/arc42/08-crosscutting-concepts.md‎

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@@ -67,4 +67,4 @@ facade holds no mutable state; the writer's client-id provider and the observer'
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| Services | MockK store, kotlinx-coroutines-test, Robolectric for writes | paging, limits, validation before SDK calls, error wrapping, observer on virtual time |
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| Device | Example app | permission flows and real data on a phone |
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70-
The suite runs against the real SDK and the stub; Kover enforces ≥ 98% line coverage.
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The suite (97 tests) runs against the real SDK and the stub; Kover enforces ≥ 99% line and ≥ 74% branch coverage (measured 99.94% / 74.5%). Nearly all missed branches are generated by the kotlinx.serialization plugin (`write$Self`, decoding constructors) and are unreachable because payloads always encode defaults.

‎docs/arc42/10-quality-requirements.md‎

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@@ -24,5 +24,5 @@
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| Q6 | The app lacks partner approval and requests write permissions | `NotAuthorized` with SDK code 2003 in `cause`; reads still work when requested separately | Verified on a Pixel 7a |
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| Q7 | A read of a large range runs on the main dispatcher | The UI stays responsive | Suspend calls only; no `runBlocking`, `Looper.prepare()` or blocking waits |
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| Q8 | A contributor without the SDK runs the build | Everything compiles and tests run against the stub | `./gradlew :library:testDebugUnitTest` without `library/libs` |
27-
| Q9 | A PR changes behavior | Unit tests run against the real SDK and the stub | 67 tests, line coverage ≥ 98% (Kover gate) |
27+
| Q9 | A PR changes behavior | Unit tests run against the real SDK and the stub | 97 tests; Kover gates ≥ 99% lines, ≥ 74% branches |
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| Q10 | A developer looks for how to call an API | README snippet and an Example app row exist | One demo row per public method |

‎library/build.gradle.kts‎

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@@ -1,3 +1,5 @@
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import kotlinx.kover.gradle.plugin.dsl.CoverageUnit
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13
plugins {
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alias(libs.plugins.android.library)
35
alias(libs.plugins.kotlin.android)
@@ -81,7 +83,10 @@ kover {
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}
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verify {
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rule {
84-
minBound(98)
86+
// Raise both to the measured level with every test PR; never lower them. Most missed branches
87+
// are kotlinx.serialization-generated code (write${'$'}Self, decoding constructors), unreachable here.
88+
minBound(99, CoverageUnit.LINE)
89+
minBound(74, CoverageUnit.BRANCH)
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}
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}
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}

‎library/src/main/kotlin/com/kvs/samsunghealthreporter/decorator/Extensions+Device.kt‎

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@@ -1,13 +1,19 @@
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package com.kvs.samsunghealthreporter.decorator
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33
import com.kvs.samsunghealthreporter.model.Device
4+
import com.samsung.android.sdk.health.data.device.AccessoryType
5+
import com.samsung.android.sdk.health.data.device.DeviceGroup
46
import com.samsung.android.sdk.health.data.device.Device as OriginalDevice
57

68
internal val OriginalDevice.harmonized: Device
79
get() =
810
Device(
911
id = id,
10-
type = (deviceType as? Enum<*>)?.name ?: deviceType.toString(),
12+
type =
13+
when (val type = deviceType) {
14+
is DeviceGroup -> type.name
15+
is AccessoryType -> type.name
16+
},
1117
manufacturer = manufacturer,
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model = model,
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name = name,

‎library/src/main/kotlin/com/kvs/samsunghealthreporter/service/SamsungHealthWriter.kt‎

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@@ -32,7 +32,7 @@ public class SamsungHealthWriter internal constructor(
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* @throws SamsungHealthException.NotAuthorized when write permission is missing
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*/
3434
public suspend fun insert(samples: List<WritableSample>): List<WritableSample> {
35-
val identified = samples.map { it.clientDataId?.let { _ -> it } ?: it.withClientDataId(makeClientDataId()) }
35+
val identified = samples.map { if (it.clientDataId != null) it else it.withClientDataId(makeClientDataId()) }
3636
identified.groupBy { it.healthType }.forEach { (type, group) ->
3737
val builder = type.writeable.insertDataRequestBuilder
3838
group.forEach { builder.addData(it.asOriginal) }

‎library/src/test/kotlin/com/kvs/samsunghealthreporter/Fixtures.kt‎

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Original file line numberDiff line numberDiff line change
@@ -43,6 +43,7 @@ const val OFFSET = 7_200
4343
val source = DataSource(appId = "com.example", deviceId = "device-1")
4444

4545
/** Parses JSON into the plain map a Flutter plugin would send. */
46+
@Suppress("UNCHECKED_CAST") // a JSON object always parses to a string-keyed map
4647
fun String.asMap(): Map<String, Any?> = Json.parseToJsonElement(this).plain as Map<String, Any?>
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private val JsonElement.plain: Any?
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1+
package com.kvs.samsunghealthreporter.decorator
2+
3+
import com.kvs.samsunghealthreporter.END
4+
import com.kvs.samsunghealthreporter.START
5+
import com.kvs.samsunghealthreporter.SamsungHealthException
6+
import com.kvs.samsunghealthreporter.model.DataSource
7+
import com.kvs.samsunghealthreporter.model.SourceFilter
8+
import com.kvs.samsunghealthreporter.model.TimeGroup
9+
import com.kvs.samsunghealthreporter.model.TimeRange
10+
import com.kvs.samsunghealthreporter.model.type.Aggregation
11+
import com.kvs.samsunghealthreporter.model.type.HealthType
12+
import com.kvs.samsunghealthreporter.model.type.MealType
13+
import com.kvs.samsunghealthreporter.model.type.TimeGroupUnit
14+
import com.samsung.android.sdk.health.data.data.AggregatedData
15+
import com.samsung.android.sdk.health.data.data.HealthDataPoint
16+
import com.samsung.android.sdk.health.data.device.AccessoryType
17+
import com.samsung.android.sdk.health.data.device.DeviceGroup
18+
import com.samsung.android.sdk.health.data.device.DeviceType
19+
import com.samsung.android.sdk.health.data.error.HealthDataException
20+
import com.samsung.android.sdk.health.data.error.PlatformInternalException
21+
import com.samsung.android.sdk.health.data.request.DataType
22+
import com.samsung.android.sdk.health.data.request.LocalDateGroupUnit
23+
import io.mockk.every
24+
import io.mockk.mockk
25+
import kotlinx.serialization.json.JsonArray
26+
import kotlinx.serialization.json.JsonNull
27+
import kotlinx.serialization.json.JsonObject
28+
import kotlinx.serialization.json.JsonPrimitive
29+
import org.junit.Test
30+
import java.time.Instant
31+
import kotlin.test.assertEquals
32+
import kotlin.test.assertFailsWith
33+
import kotlin.test.assertIs
34+
import kotlin.test.assertNull
35+
import com.samsung.android.sdk.health.data.data.DataSource as OriginalDataSource
36+
import com.samsung.android.sdk.health.data.device.Device as OriginalDevice
37+
38+
class DecoratorTest {
39+
@Test
40+
fun `map values of every supported kind become json`() {
41+
val sut =
42+
mapOf(
43+
"null" to null,
44+
"json" to JsonPrimitive("raw"),
45+
"string" to "text",
46+
"number" to 1.5,
47+
"boolean" to true,
48+
"enum" to MealType.LUNCH,
49+
"map" to mapOf(1 to "one"),
50+
"list" to listOf(1, 2),
51+
"array" to arrayOf("a", "b"),
52+
).asJsonElement
53+
54+
assertIs<JsonObject>(sut)
55+
assertEquals(JsonNull, sut["null"])
56+
assertEquals(JsonPrimitive("raw"), sut["json"])
57+
assertEquals(JsonPrimitive(true), sut["boolean"])
58+
assertEquals(JsonPrimitive("LUNCH"), sut["enum"])
59+
assertEquals(JsonObject(mapOf("1" to JsonPrimitive("one"))), sut["map"])
60+
assertEquals(JsonArray(listOf(JsonPrimitive(1), JsonPrimitive(2))), sut["list"])
61+
assertEquals(JsonArray(listOf(JsonPrimitive("a"), JsonPrimitive("b"))), sut["array"])
62+
}
63+
64+
@Test
65+
fun `unsupported map value throws`() {
66+
assertFailsWith<SamsungHealthException.InvalidValue> { mapOf("date" to Instant.EPOCH).asJsonElement }
67+
}
68+
69+
@Test
70+
fun `any other Samsung Health error becomes Platform with its code`() {
71+
val internal = PlatformInternalException(9000, "database")
72+
val sut = assertIs<SamsungHealthException.Platform>(internal.wrapped)
73+
assertEquals(9000, sut.errorCode)
74+
assertEquals(internal, sut.cause)
75+
assertNull(assertIs<SamsungHealthException.Platform>(HealthDataException(null, "unknown").wrapped).errorCode)
76+
}
77+
78+
@Test
79+
fun `devices keep their group or accessory type`() {
80+
fun device(type: DeviceType) =
81+
mockk<OriginalDevice> {
82+
every { id } returns "id"
83+
every { deviceType } returns type
84+
every { manufacturer } returns null
85+
every { model } returns null
86+
every { name } returns null
87+
}
88+
assertEquals("WEIGHT_SCALE", device(AccessoryType.WEIGHT_SCALE).harmonized.type)
89+
assertEquals("RING", device(DeviceGroup.RING).harmonized.type)
90+
}
91+
92+
@Test
93+
fun `enum without a matching entry throws`() {
94+
assertFailsWith<SamsungHealthException.InvalidValue> {
95+
DataType.SleepType.StageType.UNDEFINED
96+
.mapped<TimeGroupUnit>()
97+
}
98+
}
99+
100+
@Test
101+
fun `unsupported aggregate value throws`() {
102+
val data =
103+
mockk<AggregatedData<Any>> {
104+
every { startTime } returns Instant.ofEpochMilli(START)
105+
every { endTime } returns Instant.ofEpochMilli(END)
106+
every { value } returns "text"
107+
}
108+
assertFailsWith<SamsungHealthException.InvalidValue> { data.harmonize(Aggregation.STEPS_TOTAL) }
109+
}
110+
111+
@Test
112+
fun `instantaneous data point has no end`() {
113+
// Samsung Health rejects heart rate without an end time, but not instantaneous types like body temperature.
114+
val point =
115+
HealthDataPoint
116+
.builder()
117+
.setStartTime(Instant.ofEpochMilli(START))
118+
.addFieldData(DataType.BodyTemperatureType.BODY_TEMPERATURE, 36.6f)
119+
.build()
120+
assertEquals(START, point.startTimestamp)
121+
assertNull(point.endTimestamp)
122+
assertFailsWith<SamsungHealthException.InvalidValue> { point.requiredEndTimestamp }
123+
assertFailsWith<SamsungHealthException.InvalidValue> { HealthType.HEART_RATE.sample(point) }
124+
}
125+
126+
@Test
127+
fun `data source is copied from Samsung Health`() {
128+
val point =
129+
mockk<HealthDataPoint> {
130+
every { dataSource } returns
131+
mockk<OriginalDataSource> {
132+
every { appId } returns "com.example"
133+
every { deviceId } returns "device-1"
134+
}
135+
every { zoneOffset } returns null
136+
}
137+
assertEquals(DataSource("com.example", "device-1"), point.source)
138+
assertNull(point.zoneOffsetSeconds)
139+
}
140+
141+
@Test
142+
fun `every date unit maps to a local date group`() {
143+
val units =
144+
mapOf(
145+
TimeGroupUnit.DAILY to LocalDateGroupUnit.DAILY,
146+
TimeGroupUnit.WEEKLY to LocalDateGroupUnit.WEEKLY,
147+
TimeGroupUnit.MONTHLY to LocalDateGroupUnit.MONTHLY,
148+
TimeGroupUnit.YEARLY to LocalDateGroupUnit.YEARLY,
149+
)
150+
units.keys.forEach { TimeGroup(it, 2).asLocalDateGroup }
151+
assertEquals(4, units.size)
152+
}
153+
154+
@Test
155+
fun `source filters map to Samsung Health filters`() {
156+
SourceFilter.LocalDevice.asOriginal
157+
SourceFilter.SamsungHealth.asOriginal
158+
SourceFilter.App("com.example").asOriginal
159+
}
160+
161+
@Test
162+
fun `today is the default day`() {
163+
val sut = TimeRange.day()
164+
assertEquals(TimeRange.day(System.currentTimeMillis()).start, sut.start)
165+
}
166+
}

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