Classroom Session 6 - Test Harness Example: extract_name()

main.cpp

#include <iostream>

using namespace std;

/**
 * @brief Extracts the name out of a greeting.
 *
 * For example, given the input "Hello, my name is John.", this function should
 * return "John". Exclamatory statements should work as well ("... is John!").
 * Also, any greeting may be used, ex: "Grettings fellow, my name is John!" will
 * still return "John".
 *
 * @param sentence The greeting to extract the name from.
 * @return The name and nothing else.
 */
string extract_name(string sentence) {
	// TODO: Finish this function.
	return "John";
}

int main() {
	string result;

	result = extract_name("Hello, my name is John.");
	if (result != "John") {
		cout << "FAIL: Failed on input 'Hello, my name is John'. Returned '"
		     << result << "'.";
	}

	// TODO: Finish this Test Harness.

	return 0;
}

main2.cpp

#include <iostream>

using namespace std;

/**
 * @brief Extracts the name out of a greeting.
 *
 * For example, given the input "Hello, my name is John.", this function should
 * return "John". Exclamatory statements should work as well ("... is John!").
 * Also, any greeting may be used, ex: "Grettings fellow, my name is John!" will
 * still return "John".
 *
 * @param sentence The greeting to extract the name from.
 * @return The name and nothing else.
 */
string extract_name(string sentence) {
	return "John";
}

int main() {
	string result;

	result = extract_name("Hello, my name is John.");
	if (result != "John") {
		cout << "FAIL: Failed on input 'Hello, my name is John.'. Returned '"
		     << result << "'." << endl;
	} else {
		cout << "SUCCESS: Succeeded on input 'Hello, my name is John.'. "
		     << "Returned '" << result << "'." << endl;
	}

	result = extract_name("Hello, my name is Billy.");
	if (result != "Billy") {
		cout << "FAIL: Failed on input 'Hello, my name is Billy.'. Returned '"
		     << result << "'." << endl;
	} else {
		cout << "SUCCESS: Succeeded on input 'Hello, my name is Billy.'. "
		     << "Returned '" << result << "'." << endl;
	}

	result = extract_name("Hello, my name is John!");
	if (result != "John") {
		cout << "FAIL: Failed on input 'Hello, my name is John!'. Returned '"
		     << result << "'." << endl;
	} else {
		cout << "SUCCESS: Succeeded on input 'Hello, my name is John!'. "
		     << "Returned '" << result << "'." << endl;
	}

	result = extract_name("Greetings human, my name is Joseph!");
	if (result != "Joseph") {
		cout << "FAIL: Failed on input 'Greetings human, my name is Joseph!'. "
		     << "Returned '" << result << "'." << endl;
	} else {
		cout << "SUCCESS: Succeeded on input 'Greetings human, my name is "
			 << "Joseph'. Returned '" << result << "'." << endl;
	}
	
	return 0;
}

main3.cpp

#include <iostream>

using namespace std;

/**
 * @brief Extracts the name out of a greeting.
 *
 * For example, given the input "Hello, my name is John.", this function should
 * return "John". Exclamatory statements should work as well ("... is John!").
 * Also, any greeting may be used, ex: "Grettings fellow, my name is John!" will
 * still return "John".
 *
 * @param sentence The greeting to extract the name from.
 * @return The name and nothing else.
 */
string extract_name(string sentence) {
	return "John";
}

void test_extract_name(string sentence, string expected) {
	string result = extract_name(sentence);
	if (result != expected) {
		cout << "FAILURE: Failed on input '" << sentence << "'. Expected '"
		     << expected << "' but got '" << result << "'." << endl;
	} else {
		cout << "SUCCESS: Succeeded on input '" << sentence << "'. Got '"
		     << result << "'." << endl;
	}
}

int main() {
	test_extract_name("Hello, my name is John.", "John");
	test_extract_name("Hello, my name is Billy.", "Billy");
	test_extract_name("Hello, my name is John!", "John");
	test_extract_name("Greetings human, my name is Joseph!", "Joseph");
	
	return 0;
}

main4.cpp

#include <iostream>

using namespace std;

/**
 * @brief Extracts the name out of a greeting.
 *
 * For example, given the input "Hello, my name is John.", this function should
 * return "John". Exclamatory statements should work as well ("... is John!").
 * Also, any greeting may be used, ex: "Grettings fellow, my name is John!" will
 * still return "John".
 *
 * @param sentence The greeting to extract the name from.
 * @return The name and nothing else.
 */
string extract_name(string sentence) {
	// I create a constant here because I use this string twice in the following
	// code and I did not want to repeat myself.
	const string MY_NAME_IS = " my name is ";

	// Find the " my name is " portion of the sentence.
	int first_marker = sentence.find(MY_NAME_IS);

	// Grab from the end of " my name is " to the end of the string.
	string name = sentence.substr(first_marker + MY_NAME_IS.size());

	// Cut off the ending punctuation mark.
	name = name.substr(0, name.size() - 1);

	return name;
}

void test_extract_name(string sentence, string expected) {
	string result = extract_name(sentence);
	if (result != expected) {
		cout << "FAILURE: Failed on input '" << sentence << "'. Expected '"
		     << expected << "' but got '" << result << "'." << endl;
	} else {
		cout << "SUCCESS: Succeeded on input '" << sentence << "'. Got '"
		     << result << "'." << endl;
	}
}

int main() {
	test_extract_name("Hello, my name is John.", "John");
	test_extract_name("Hello, my name is Billy.", "Billy");
	test_extract_name("Hello, my name is John!", "John");
	test_extract_name("Greetings human, my name is Joseph!", "Joseph");
	
	return 0;
}