test coverage update

Author: heckj

Tests/SwiftVizTests/TickTests.swift

@@ -74,4 +74,19 @@ final class TickTests: XCTestCase {
         }
         XCTAssertEqual(tick.label, "")
     }
+
+    func testDefaultTicksInt() {
+        let scale = LinearScale.IntScale(from: 0, to: 10)
+        XCTAssertEqual(scale.ticks(rangeLower: 0, rangeHigher: 100).count, 10)
+    }
+
+    func testDefaultTicksFloat() {
+        let scale = LinearScale.FloatScale(from: 0, to: 10)
+        XCTAssertEqual(scale.ticks(rangeLower: 0, rangeHigher: 100).count, 6)
+    }
+
+    func testDefaultTicksDouble() {
+        let scale = LinearScale.DoubleScale(from: 0, to: 10)
+        XCTAssertEqual(scale.ticks(rangeLower: 0, rangeHigher: 100).count, 6)
+    }
 }