Added tests for 'show' exercise in 'String templates'

Programming Basics/String Templates/Exercise 3/src/Task.kt

@@ -0,0 +1,18 @@
+package stringTemplates3
+
+fun show(i: Int, s: String, c: Char, d: Double) {
+  println("i: $i")
+  println("""s: "$s"""")
+  println("c: '$c'")
+  println("d: $d")
+}
+
+fun main() {
+  show(1, "abc", 'd', 2.0)
+}
+/* Expected output:
+i: 1
+s: "abc"
+c: 'd'
+d: 2.0
+*/

Programming Basics/String Templates/Exercise 3/task-info.yaml

@@ -0,0 +1,6 @@
+type: edu
+files:
+- name: src/Task.kt
+  visible: true
+- name: test/Tests.kt
+  visible: false

Programming Basics/String Templates/Exercise 3/task.md

@@ -0,0 +1,16 @@
+## String Templates (#3)
+
+Write a function `show()` with parameters `i: Int`, `s: String`, `c: Char` 
+and `d: Double`. The function should display on the console the value of each
+parameter in its own line: first the name of the identifier, a colon and space, 
+and then the value of that identifier. Surround the string value with double
+quotes and the char value with single quotes. 
+
+Sample output:
+
+```
+i: 10
+s: "abc"
+c: 'a'
+d: 1.0
+```

Programming Basics/String Templates/Exercise 3/test/Tests.kt

@@ -0,0 +1,45 @@
+import org.junit.Assert
+import org.junit.Test
+import stringTemplates3.show
+import java.io.ByteArrayOutputStream
+import java.io.PrintStream
+import kotlin.reflect.KFunction
+import kotlin.reflect.KParameter
+
+class TestShowFunction {
+  @Test
+  fun testShow() {
+    val showMethod = ::show
+    Assert.assertEquals("'show' method should have 4 parameters", 4, showMethod.parameters.size)
+    val (i, s, c, d) = showMethod.parameters
+    checkParameter(i, "i", "kotlin.Int")
+    checkParameter(s, "s", "kotlin.String")
+    checkParameter(c, "c", "kotlin.Char")
+    checkParameter(d, "d", "kotlin.Double")
+
+    testArguments(showMethod, 1, "abc", 'd', 2.0)
+    testArguments(showMethod, 193, "string", '&', -7.51)
+  }
+
+  private fun testArguments(showMethod: KFunction<*>, i: Int, s: String, c: Char, d: Double) {
+    val byteArrayOutputStream = ByteArrayOutputStream()
+    System.setOut(PrintStream(byteArrayOutputStream))
+
+    val message = "Incorrect output for 'show' function call"
+    val expectedOutput = """
+        i: $i
+        s: "$s"
+        c: '$c'
+        d: $d
+      """.trimIndent()
+    showMethod.call(i, s, c, d)
+
+    val output = byteArrayOutputStream.toString().trim()
+    Assert.assertEquals(message, expectedOutput, output)
+  }
+
+  private fun checkParameter(i: KParameter, expectedName: String, expectedType: String) {
+    Assert.assertEquals("The name of the first parameter should be '$expectedName'", expectedName, i.name)
+    Assert.assertEquals("The type of the first parameter should be '$expectedType'", expectedType, i.type.toString())
+  }
+}

Programming Basics/String Templates/lesson-info.yaml

@@ -2,5 +2,6 @@ content:
 - Examples
 - Exercise 1
 - Exercise 2
+- Exercise 3
 - Exercise 4
 - Exercise 5