feat: Begins pressure estimation feature tests.

Tests/PressureEstimationsFeatureTests/FlaggedMeasurementListTests.swift

@@ -0,0 +1,28 @@
+import ComposableArchitecture
+import Testing
+@testable import PressureEstimationsFeature
+
+struct FlaggedMeasurementListTests {
+
+  @Test(
+    "Ensure Estimation Has Changes",
+    .tags(.flaggedMeasurementList)
+  )
+  func ensureHasChanges() {
+    let reducer = FlaggedMeasurementsList()
+    let result = reducer.ensureHasChanges(
+      formState: .init(
+        existingMeasurement: SharedReader(Shared(.mock(type: .airHandler))),
+        cfmTextField: 350,
+        filterPressureDrop: 0.1
+      ),
+      flaggedEstimations: []
+    )
+    #expect(result != nil)
+  }
+
+}
+
+extension Tag {
+  @Tag static var flaggedMeasurementList: Self
+}