Put Pit Log under version control so the app and sync server can live on git.

app/src/test/java/com/racingapp/pitlog/model/SetupLogTest.kt

@@ -0,0 +1,43 @@
+package com.racingapp.pitlog.model
+
+import com.racingapp.pitlog.data.SetupSheet
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class SetupLogTest {
+    @Test
+    fun diffsOnlyTheFieldsThatMoved() {
+        val original = SetupSheet(
+            recordedAt = 1L,
+            springRf = 1000,
+            toeFront = 0.125,
+            swayBarHole = 4,
+        )
+        val later = original.copy(
+            springRf = 1050,
+            toeFront = 0.063,
+            swayBarHole = 3,
+        )
+        assertEquals(
+            listOf(
+                "RF spring 1000 lb → 1050 lb",
+                "Sway bar Setting 4 → Setting 3",
+                "Front toe 0.125 in → 0.063 in",
+            ),
+            setupDiffs(original, later),
+        )
+    }
+
+    @Test
+    fun anUnchangedSheetHasNoDiff() {
+        val sheet = SetupSheet(recordedAt = 1L, springLf = 950, camberRf = -7.0)
+        assertTrue(setupDiffs(sheet, sheet.copy(note = "perch tweak")).isEmpty())
+    }
+
+    @Test
+    fun originalLinesSkipBlankFields() {
+        val lines = setupLines(SetupSheet(recordedAt = 1L, crossPercent = 53.5, blockLr = 2.0))
+        assertEquals(listOf("Cross 53.5%", "LR block 2 in"), lines)
+    }
+}